Differential pressure transmitter with a digital display, mounted on a valve manifold with its impulse lines

Maker context

Maker data makes a multi-maker RFQ easier to identify and quote.

Use the nameplate, model, serial, part-book page, old order reference or photo of the removed component. The more precise the equipment identity, the clearer the commercial route can be. Already have the designation? Look it up in the model index.

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Vessel Core uses manufacturer and maker references to identify equipment in an RFQ. Their appearance on this page does not mean authorisation, dealership, representation or partnership.

Model index

765 entries in one table: 603 model designations, plus 162 duty and identification notes.

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765 models

Marine equipment model index: designation, series, maker, equipment type and the parts typically requested against each model.
Model	Series	Maker	Equipment	Typical parts
A100-L / A170-L	ABB A-Series Axial	ABB	Turbochargers	Axial-flow turbochargers for large two-stroke main engines. Rotor blades, nozzle rings, labyrinth seals, diffuser plates, journal bearings.
A175-L / A180-L	ABB A-Series Axial	ABB	Turbochargers	High-capacity axial units for large-bore slow-speed engines. Turbine nozzle segments, rotor assemblies, thrust bearings, casing components.
A200-L	ABB A-Series Axial	ABB	Turbochargers	A200-L RFQs can include compressor wheels, diffuser plates, inlet casing, bearing housings and cartridge assemblies. Confirm the complete rating-plate identity and installed configuration.
Power2 two-stage turbocharging	ABB Power2	ABB	Turbochargers	Two-stage turbocharging components for Power2 systems. Each stage needs exact confirming evidence of what is actually installed: type, serial number, rating-plate data and part designation.
TPL65 / TPL67	ABB TPL Series	ABB	Turbochargers	Compact axial-turbine turbochargers for medium-bore four-stroke engines. Nozzle rings, bearings, labyrinth seals, turbine inlet casings.
TPL73 / TPL77	ABB TPL Series	ABB	Turbochargers	Mid-range TPL units for medium-speed generators and propulsion engines. Rotor blades, compressor wheels, bearing cartridges, diffusers.
TPL80	ABB TPL Series	ABB	Turbochargers	TPL80 RFQs can include cartridge assemblies, nozzle ring sets, compressor casing, bearing housings and seal kits. Confirm the exact type and serial evidence.
TPS44 / TPS48 / TPS52 / TPS57 / TPS61	ABB TPS Series	ABB	Turbochargers	Mixed-flow turbochargers for four-stroke auxiliary engines and diesel generator sets. Cartridge assemblies, nozzle rings, compressor wheels, bearings and seal kits. Confirm the exact type and serial evidence.
VTR214 / VTR254	ABB VTR Series	ABB	Turbochargers	Compact VTR series for smaller four-stroke engines and auxiliary units. Nozzle rings, rotor blades, bearings, labyrinth seals, end covers.
VTR304 / VTR354 / VTR454	ABB VTR Series	ABB	Turbochargers	Mid and large VTR series for medium-speed and low-speed diesels. Turbine nozzle segments, compressor wheels, complete cartridge assemblies, casing sets.
MAB 103 / MAB 104	Alfa Laval MAB / MMB	Alfa Laval	Separators	Older MAB series fuel oil clarifiers. Disc stacks, bowl components, spindle bearings, and seal kits for service and overhaul.
MAPX 207 / MAPX 309	Alfa Laval MAPX	Alfa Laval	Separators	Marine lube oil purifiers. Disc stacks, bowl liner, operating water valves, spindle assemblies, and full service kits. Requests for the related MOPX series are also accepted.
MAPX 313	Alfa Laval MAPX	Alfa Laval	Separators	Larger MAPX lube oil purifier. Bowl assemblies, paring disc, solenoid valves, bearing housings, seals, and overhaul gasket sets.
MMB 304 · MMB 305 · PureNOx	Alfa Laval MMB / PureNOx	Alfa Laval	Separators	MMB lube oil separators and the PureNOx EGR circuit water separator. Bowl assemblies, disc stacks, solenoid valves, and overhaul kits.
S831	Alfa Laval ALCAP	Alfa Laval	Separators	ALCAP fuel oil and lube oil purifier. Disc stack assemblies, bowl liner, operating water valve, spindle assembly, O-ring kits.
S861 / S866	Alfa Laval ALCAP	Alfa Laval	Separators	Larger ALCAP S-series separators. Bowl assemblies, paring discs, solenoid valves, seals, bearings, and complete overhaul gasket sets.
WHPX 405 / WHPX 407	Alfa Laval WHPX	Alfa Laval	Separators	High-performance fuel oil purifiers. Disc stacks, bowl liner sets, operating water valves, spindle bearings, and seal kits.
WHPX 410 / WHPX 413	Alfa Laval WHPX	Alfa Laval	Separators	Larger WHPX series units. Complete bowl assemblies, paring discs, solenoid valve kits, bearing sets, and overhaul O-ring sets.
JWP-16 · JWP-26	JWP · titanium plate distiller	Alfa Laval	Freshwater generators	The figure in the type designation is the connection flange size, not an output, and the plate quantity inside the unit is the one number the name does not carry. Evaporator and condenser plate packs, gaskets, ejector parts, the brine and distillate pump wear set and the salinometer items are the recurring lines, and a plate pack cannot be ordered from the type designation alone.
JWSP · SP	Earlier designations	Alfa Laval	Freshwater generators	Units still in service carry designations the current programme no longer lists, and trade press of the period introduced these titanium plate distillers under the Nirex name, while the maker's own dimension table sets JWSP and SP beside JWP. Send the plate as written rather than matched to the nearest current type; the plate pack, the gasket set and the ejector are what the designation has to reach.
Desalt DPU · DPU-2 · DPU-36-C	DPU · two-stage plate distiller	Alfa Laval	Freshwater generators	The DPU units are titanium plate distillers working under vacuum, DPU-2 naming the two-stage build. Replacement evaporator and condenser plate packs, gaskets, ejector and pump parts are the usual scope; the Desalt name appears on this line beside the Alfa Laval one.
M3 · M6 · M10 · M15 · M20 · M30	M · gasketed plate	Alfa Laval	Heat exchangers	The M frames are the gasketed plate coolers met across jacket-water, lube-oil and central-cooling duty. Plates, gaskets, tightening bolts and the frame and pressure plate lining are the items; the suffix after the size, as in M10-BFM, separates plate and gasket executions and belongs in the request.
MX25 · MK15	MX / MK · gasketed plate	Alfa Laval	Heat exchangers	The MX and MK frames sit in the same programme with their own plate and gasket forms, written as MX25-B, MX25-BFG and similar. A plate ordered by frame size alone reaches more than one pressing, so send the full suffix and the plate material.
A10 · A15 · A20 · AK20 · AM20 · AX30	A / AK / AM / AX · gasketed plate	Alfa Laval	Heat exchangers	The A group covers the plate coolers written with a second letter, and AK, AM and AX are separate families rather than options of one. Executions such as AM20-B, AM20-N, AM20-S and AX30-BW carry the plate and gasket arrangement in the suffix, so copy the whole type code off the frame.
P series frames	P · gasketed plate	Alfa Laval	Heat exchangers	The P frames are the older gasketed line, written as a letter and a figure and still found on working coolers. Plates and gasket sets are the scope; where the type plate is unreadable, the plate pressing pattern and the port arrangement identify the unit from photographs.
Plate count is not in the type code	Plate packs and gaskets	Alfa Laval	Heat exchangers	A gasketed cooler leaves the works with the plate stack chosen for its duty, so two units of the same type can hold different numbers of plates. Count the plates, or send the unit serial and the drawing number with the gasket request, and note whether the pack is glued or clip-on because that changes the item, not the price.
FC80 · FC100 · FC120 · FC140 · FC160	Oil coolers	Bowman	Heat exchangers	Oil coolers in body sizes from FC80 to FC160, with marine builds using cupro-nickel tube stacks. Tube stacks, end covers, O-rings and gaskets are quoted against the full part number after the size.
EC80	Tubular heat exchangers	Bowman	Heat exchangers	Tubular heat exchangers for engines where no integral expansion tank is needed and the system uses a remote header tank. End covers, seals and tube stacks are matched to the complete number.
FG100	Charge air coolers	Bowman	Heat exchangers	Charge air coolers that must run with the full flow of the engine water pump when used with a header tank heat exchanger. Tube stacks and seals are quoted against the full part number and the engine the cooler serves.
UX-10 · UX-20 · UX-90 · UX-100	UX · gasketed plate	Hisaka	Heat exchangers	UX models run from small plates to large ones under a single series letter, so UX-10 and UX-100 share a name but no plate. Each number is a plate type of its own, and replacement gaskets are offered against that plate type, for example an FKM gasket for the UX20 plate. Inside one frame the gaskets can also differ by position in the pack, so the plate arrangement drawing is worth sending with the order. Plates, gasket sets and tightening bolts are the usual lines.
RX series	RX · gasketed plate	Hisaka	Heat exchangers	RX is a separate Hisaka plate family with its own gasketting manual, and independent gasket makers list RX plates and gaskets under their own references. A UX gasket set will not seat on an RX plate even where the frames look alike, so the series letters on the nameplate decide the catalogue before the number does.
Glued and slit-in plates	Gasket fixing	Hisaka	Heat exchangers	Hisaka plates are built either for glued gaskets or as slit-in plates, on which the gasket is pressed into the plate without adhesive. Replacement sets are listed separately for the two fixings, as with the glued and slit-in versions of the UX10 plate, so a glued set is not the answer for a slit-in plate. Say which is fitted, or send a photograph of a removed plate along the gasket groove.
Lube oil cooler · generator fresh water cooler	Marine duties	Hisaka	Heat exchangers	Hisaka plate heat exchangers serve on board as lube oil coolers and as fresh water coolers for the generator engines, and spare plates and gaskets are offered for both duties. Name the cooler in the enquiry, not only the circuit: each one is a separate frame with its own plate count and its own gasket compound.
Pump, coupling and driver on a baseplate	Complete units	Allweiler	Pumps	Many shipboard installations are supplied as a mounted set. Coupling elements, guards, baseplate hardware and the driver identity are worth listing separately, since a vibration complaint is often a coupling or alignment matter rather than a pump matter.
AE series	Eccentric screw · AE series	Allweiler	Pumps	Allweiler's AE range eccentric screw pumps run a chromed rotor inside an elastomer stator, driven through a jointed drive shaft. The stator carries twice the rotor pitch and one lobe more, which is what forms the sealed cavities that travel along the axis. On sludge, bilge, waste oil and chemical dosing duty the stator is the consumable — and its compound, not the pump size, sets the replacement interval.
SN series — three-screw, fuel and lube oil duty	Three-screw · SN series	Allweiler	Pumps	One driving spindle meshing with two idler spindles inside a close-fitted bore. Seen on heavy fuel supply and circulating duty and equally on lube oil service, since the pumped oil is also the film that carries the idlers.
SNS series — three-screw, alternative bearing and sealing execution	Three-screw · SNS series	Allweiler	Pumps	A three-screw build differing in bearing arrangement, sealing execution and mounting rather than in application; it turns up on lube oil circulation, stern tube service, hydraulic power packs and fuel duty alike. Quiet running and virtually pulsation-free flow are the reason it is chosen, and the reason wear is noticed late.
NB · NIS · NISO	Centrifugal · NB, NIS, NISO	Allweiler	Pumps	Allweiler's NB, NIS and NISO ranges follow the EN 733 dimension standard, which is why a bearing bracket sometimes interchanges and a seal chamber does not. State the type code and the actual impeller diameter — these pumps leave the works with the impeller machined down to the ordered duty point, so the trim is not recoverable from the model name.
Transfer and bunkering duty	Three-screw · larger frames	Allweiler	Pumps	Larger screw frame sizes handle fuel transfer between tanks and bunker lines — high delivered volume at modest differential pressure. Pressure capability comes from the number of sealing chambers along the spindle, so on these frames it is the condition of the flanks and the bore, rather than the driver rating, that decides whether rated capacity is still reached.
AN and BOB series	Centrifugal · long-coupled baseplate	Azcue	Pumps	Baseplate-mounted single-stage units driven through a flexible coupling, AN covering heavy-duty service. Requests cover the impeller, the wear-ring pair, the seal assembly, drive-end and non-drive-end bearings and the coupling element.
BT-HM / BT-LV series	Positive displacement · triple screw	Azcue	Pumps	Triple-screw pumps on fuel oil transfer, MDO and LSGO service, and low- and high-viscosity lube oil duty — BT-HM close-coupled, BT-LV vertical in-line. Component requests centre on the screw set (power rotor and idler screws), the insert or liner, shaft seal, bearings and the built-in relief valve spring and seat.
CA series	Centrifugal · self-priming	Azcue	Pumps	Horizontal self-priming single-stage centrifugal. The inlet sits high on the casing so liquid is retained after the first prime, allowing repeated priming on bilge, ballast, deck wash and grey water duty and short dry running. Passes soft solids — state the size actually required. Built close-coupled with a lantern bracket or as a bare-shaft head, in cast iron GG25, bronze or AISI 316. Wear parts: impeller — closed or semi-open depending on the build, so state which is fitted — casing and cover wear rings, mechanical seal, shaft sleeve and casing gasket.
CM, LN and VM/VR series	Centrifugal · vertical in-line	Azcue	Pumps	Vertically arranged in-line pumps used where deck and flat space is tight — cooling circuits, transfer and pressure sets. CM is long-coupled, LN is close-coupled, VM and VR are rigid-coupled. Shaft, sleeve, seal seat and bearing bracket components dominate the wear list.
CP series	Centrifugal · close-coupled	Azcue	Pumps	Small close-coupled (monobloc) single-stage centrifugal, with lantern bracket and back pull-out design so the motor comes off without breaking pipework. Requests typically cover the impeller, wear-ring pair, mechanical seal, pump shaft and bearings.
Fire, bilge and sanitary sets	Statutory service	Azcue	Pumps	Pumps serving fire main, bilge and sanitary systems usually carry documentation expectations beyond the mechanical fit. Flag those duties in the request so the route and paperwork question is settled before quotation.
MA, MO/BR, RA, KL/KB and RKZ	Side channel and eccentric screw	Azcue	Pumps	The MA, MO/BR and RA side channel ranges self-prime and keep pumping gas-laden liquid on tank stripping and priming duty, with a stage code carried in the model number. KL and KB eccentric screw units and RKZ vertical piston pumps handle viscous and sludge media. State the stage count and the medium so stage components, rotor and stator can be scoped.
MN series	Centrifugal · monobloc to DIN 24255	Azcue	Pumps	Horizontal close-coupled (monobloc) single-stage centrifugal built to the DIN 24255 footprint — the workhorse range on cooling, ballast and general service, dropping into existing DIN 24255 pipework. Impeller, casing and cover wear rings, mechanical seal and shaft sleeve dominate the wear list.
W/V	Twin-screw pumps · W/V series	Bornemann	Pumps	Bornemann lists W/V among its twin-screw series. Used-pump listings give codes that start with W, then a size number and further letters and digits, and show such pumps ashore on fuel oil and heavy oil. Every character of the code is copied, because the letters after the size belong to the pump, and screws and seals follow the code and the serial together.
HC	Twin-screw pumps · HC series	Bornemann	Pumps	A second Bornemann twin-screw series, written HC with two groups of digits after the letters in the full code. An HC pump is never quoted from a W/V parts list of a similar size: its screws, seals and bearings come from its own code and serial.
Multiphase boosting systems	Multiphase pumping	Bornemann	Pumps	Bornemann's main oil and gas business is multiphase pumping: twin-screw pump systems for oil and gas production. Such a unit is read like any other Bornemann pump, by type code and serial, with the package plate where the pump sits on a skid.
Type 6.48 · 6.46	Automatic · lube oil	Boll & Kirch	Filtration	Continuous backflushing filters fitted in the lube-oil circuit of medium-speed diesel engines, cleaning the candle elements under running pressure without interrupting flow. Requests typically cover the candle filter elements, backflush arm and drive components, and the seal set for the housing.
Type 6.64 · 6.64 KSS	Automatic · maritime duty	Boll & Kirch	Filtration	The high-performance maritime range, built for large volumes of fuel, lubricant, coolant or alkaline media; the KSS variant is set up for coolant duty specifically. Enquiries commonly reach us for the filter element, the differential-pressure transmitter and the control-unit items that trigger the backflush cycle.
Type 6.72	Automatic · fuel oil	Boll & Kirch	Filtration	The standard automatic self-cleaning range for fuel-oil duty. Element sets, backflush valve components and the housing gasket kit are the usual scope on a fuel-oil filter overhaul.
Type 6.21 · 6.22	Automatic · smaller systems	Boll & Kirch	Filtration	Smaller-volume automatic fuel-oil filters for auxiliary circuits and smaller installations. The reduced housing size still uses the same backflush principle, but element and control-part references stay type-specific rather than scaling down from the 6.72 range.
FILTRATOR Type 8.64 · 8.72	Cat-fines protection	Boll & Kirch	Filtration	Low-pressure fuel-side units built specifically to hold back abrasive catalytic fines before they reach the injection system. Element condition and the housing's differential-pressure history are worth quoting alongside the type and serial when a set is being reordered.
Type 6.18 · aquaBoll BWT	Water treatment	Boll & Kirch	Filtration	Type 6.18 covers industrial and cooling-water backwashing duty; aquaBoll BWT sits ahead of a ballast-water treatment system as a pre-filter stage. Screen mesh rating and the duty water source belong in the enquiry for either.
Duplex Type 2.04.5	Manual · duplex strainer	Boll & Kirch	Filtration	A two-chamber changeover strainer for water, oil or fuel duty, built so one chamber can be cleaned while the other stays in service. The wire-mesh screen basket insert is the part most often reordered, together with the changeover valve seal and cover gasket.
Simplex Type 1.03.2	Manual · simplex strainer	Boll & Kirch	Filtration	A single-chamber manual strainer for smaller or non-critical lines where a changeover duplex arrangement is not fitted. Basket element, cover gasket and bolting are the recurring reference points on this type.
R · D	Element code: type letter	HYDAC	Filtration	HYDAC puts R into the code of an element for a return-line filter and D into the code of one for a pressure filter, and trade listings describe R and D elements the same way. A return element and a pressure element can share a size and still be different parts, so the letter is copied from the element and never assumed from where the housing sits.
BN4HC · ON	Element code: media	HYDAC	Filtration	BN4HC is HYDAC's code for its Betamicron glass-fibre media, and a US federal supply record describes a HYDAC element with this code as a Betamicron fibreglass element. The media code can differ between listings: HYDAC part number 1262981 reads 0240 R 010 ON in the maker's catalogue and 0240 R 010 BN4HC in a trader's listing, so the request carries both the part number and the code, and the quote states which element is offered.
SB330	Bladder accumulators	HYDAC	Filtration	HYDAC sells spare bladders for its SB330 accumulators, and a US federal supply record files a hydraulic accumulator bladder with a HYDAC SB330 reference under ship and marine equipment. The bladder is matched by accumulator type and size from the shell plate, and the precharge follows the accumulator documents.
DX · DXC	DX series	ABC	Engines	The DX line followed the earlier DU engines, DX naming the naturally aspirated build and DXC the charge-air cooled one. Requests are written around cylinder heads, liners, piston assemblies, injection equipment and bearing shells, and the letter after DX belongs in the request because it separates two different builds of the same engine.
DZ · DZC	DZ series · in-line	ABC	Engines	The in-line DZ engines are the current Anglo Belgian Corporation range for propulsion and generating duty. Cylinder covers, valve spindles and seats, fuel injection pumps, injectors, connecting rod and main bearings are the usual lines; the cylinder count in front of the code identifies the engine, so send the plate as written.
V-DZC · 12V · 16V	DZ series · V-form	ABC	Engines	The V-form DZC engines extended the range to twelve and sixteen cylinders. A V engine doubles the bank-dependent items, so state the bank and the cylinder position for heads, liners, rods and camshaft sections rather than the quantity alone.
SBA 6M 528	Deutz MWM 528	Deutz / MWM	Engines	A medium-speed frame met on older tonnage and on stationary sets ashore, written on parts lists as SBA6M528 without spaces as often as with them. Cylinder heads, liners, piston and ring sets, injection pumps, injectors and bearing shells are the usual lines.
BV · RBV · SBV 6M · 8M · 12M · 16M 540	Deutz MWM 540	Deutz / MWM	Engines	The 540 frames appear in several executions, and the letters in front of the cylinder count separate them. Requests cover liners, piston crowns and rings, cylinder heads with valves and seats, connecting rod and main bearings; copy the leading letters as well as the figure, because a part matched to BV does not always suit SBV.
SBV 6M 628 · TBD 628	Deutz MWM 628	Deutz / MWM	Engines	The 628 family covers V-form engines in six, eight, twelve and sixteen cylinders and is the Deutz frame met most often on propulsion duty. Cylinder heads, liner and piston sets, exhaust valve assemblies, fuel injection equipment, turbocharger interface parts and overhaul gasket sets are the recurring lines.
TBD 234	Deutz MWM 234	Deutz / MWM	Engines	A compact high-speed family used on generating sets and service craft. Piston and ring sets, cylinder head gaskets, injectors and injection pump elements, water pump and cooling-circuit seals and full gasket kits are what an overhaul list on this engine usually holds.
TBD 604 · TBD 620	Deutz MWM 604 / 620	Deutz / MWM	Engines	Two four-stroke families still carried on many auxiliary and propulsion installations. Requests centre on cylinder liners, piston crowns and rings, valve spindles and seat rings, injection pumps and plungers, turbocharger nozzle and bearing items and camshaft drive components.
Reading a Deutz or MWM plate	Type designation	Deutz / MWM	Engines	One engine carries two maker names: MWM built these frames and the Deutz name sits on the same programme, so a request naming only one of them is still identifiable. What is not recoverable is the execution — the letters in front of the cylinder count and the figure behind it belong together, and a code shortened to the last three digits routinely matches more than one part.
N40 · N45	NEF series	FPT Industrial	Engines	The smaller NEF engines. The N40 is a NEF propulsion engine for commercial and pleasure craft, reported in versions such as the N40 250 E. The N45 is offered in FPT's G-Drive generator range and was reported as a mechanical auxiliary unit. Filters, sea water pump rotors, belts and gasket sets are matched to the code on the plate.
N60 · N67	NEF series	FPT Industrial	Engines	The N60 was offered as a marine engine in the Iveco Motors years; larger current NEF marine engines carry N67 codes such as the N67 450 N or N67 570 EVO. FPT offers the N67 both for propulsion and as a G-Drive generator engine, so the use is part of the enquiry. Keel-cooled versions exist alongside heat-exchanger cooling, and the cooling layout changes which items are needed.
C90	Cursor series	FPT Industrial	Engines	The middle Cursor engine, built for propulsion and also reported as the C90 410, an auxiliary unit set up for on-board generators. Injection parts, turbocharger items, charge-air cooler elements and gasket sets are quoted against the full code and serial, because propulsion and generator versions are set up differently.
C13 · C13 ENT M77	Cursor series	FPT Industrial	Engines	The Cursor 13 was offered as a marine engine in the Iveco Motors years, for example as the C13 ENT M77, and FPT later presented it for both pleasure and commercial craft. The usual lines of a C13 enquiry are zinc anodes, the sea water pump rotor, cooler elements and their gaskets, the auxiliary belt and fuel filters, each checked against the code and serial.
C16 600 · C16 1000	Cursor series	FPT Industrial	Engines	The largest Cursor marine engine, derived from the Cursor 16 and listed in the C16 600 and C16 1000 versions. Parts are quoted against the complete code and serial, with the duty and the gearbox on the shaft noted in the enquiry, since the same family name covers different settings.
C78 ENT · C78 ENT M55	Cursor, Iveco Motors period	FPT Industrial	Engines	An earlier Cursor marine engine, offered in versions such as the C78 ENT M55 when the line was sold as Iveco Motors. Many of these engines still work on fishing vessels and workboats; the plate code and serial are read first, and items revised since the build are named in the reply.
N45 · N67 · C90 410	G-Drive Marine	FPT Industrial	Engines	FPT's fixed-speed range for on-board generators and hotel loads, built to work alongside its propulsion engines. A G-Drive engine is quoted on its own engine code, and the alternator of the generating set is quoted separately from the alternator's own plate.
8061 SRM	Iveco Aifo, older range	FPT Industrial	Engines	Diesel engines sold for marine use under the Fiat, Iveco and Aifo names. The letters and digits after SRM mark the version and are copied exactly. Where the plate has faded, photographs of the engine, the removed part and any number cast or stamped on it are the next evidence.
Mk7	Graviner Mk7 · auto-addressed	Graviner	Engines	A detector head sits on each crank space and analyses the oil mist where it is, without external sample pipes, and an engine-mounted control unit polls the heads and finds their addresses by itself. Each head checks itself for internal faults, and alarms and faults are kept in a dated event log. One system can cover more than one engine, each with a control unit of its own. Detector heads, control unit parts and the display are the usual lines.
Mk6	Graviner Mk6 · analogue addressable	Graviner	Engines	Each Mk6 head watches a single crank space, works without sample pipes and is given its own address, which the control unit reads together with the oil mist value; the alarm levels are set at the control unit. The control unit is mounted away from the engine, in the engine control room or another suitable place, and is wired to the heads through a junction box.
Mk5	Graviner Mk5	Graviner	Engines	Mk5 detectors are still met in service and still appear in parts listings under the Graviner and Kidde Graviner names. An Mk5 is quoted only from its own labels and its own parts list; nothing is carried over from the Mk6 or Mk7 lines, and a later head is not offered in its place.
Remote Display Unit	Mk7 display	Graviner	Engines	The optional touch-screen display of the Mk7, mounted in the engine control room, where it shows the signal of each detector and the oil mist level of the engine in alarm. It is a line of its own on the enquiry, separate from the control unit on the engine.
Injectors and nozzle holders	Injection valves	L'Orange	Fuel injection	An injector is a nozzle, a needle, a spring and a shim stack inside a holder, and each of those is a separate line. Requests that name only the nozzle leave the holder, the spring and the setting out of the scope, which is where a rebuilt injector stops matching the engine it came off.
Nozzles marked DL, DLL or DLLA	Nozzle designations	L'Orange	Fuel injection	The marking on the nozzle body is its own designation, and it is the string a buyer usually has in hand. It identifies the spray component rather than the complete injection valve, so send it together with the engine maker and model instead of in place of them.
Plunger and barrel assemblies	Pump elements	L'Orange	Fuel injection	The plunger and its barrel are lapped as a pair and are ordered as one item, not as two. Delivery valves, valve seats, springs and the pump element gasket set belong on the same request, listed against the injection pump identity rather than the engine alone.
L'Orange or Woodward L'Orange on the paperwork	Maker identity	L'Orange	Fuel injection	Fuel injection equipment on medium and large engines is frequently a bought-in component, so the plate on the engine and the marking on the injector name two different companies. Both names help: the engine identity routes the request and the injection marking narrows it to the component.
6L28HX · 8L28HX · 6L28AHX	L series · 28HX	Niigata	Engines	The 28HX in-line engines are the Niigata frames met most often on propulsion and generating duty, listed with six, eight and nine cylinders and in the AHX execution as well. Cylinder covers, liners, pistons and rings, valve spindles and seats, fuel pumps, injection valves, main and connecting rod bearings are the recurring lines.
20AX	AX series	Niigata	Engines	A smaller Niigata frame carried on coasters, tugs and service craft. Requests cover liners, piston and ring sets, cylinder head assemblies, fuel injection equipment and bearing shells, and the gear execution matters, since the same engine leaves the works with and without an integral marine gear.
25BX · 6L25BX · 6M25BX	BX series	Niigata	Engines	The 25BX frames appear with both the L and the M letter in front of the size, and the letter is part of the identity rather than decoration. Cylinder liners, piston crowns and rings, exhaust and inlet valves with their seats, fuel pump elements and bearing shells are the usual scope.
28BX · 6M28BX	BX series	Niigata	Engines	A larger BX frame, met in the M execution on Japanese-built tonnage. Requests centre on liners and pistons, cylinder covers, valve gear, injection pumps and injectors, turbocharger interface items and overhaul gasket sets.
31X · 6M31X	X series	Niigata	Engines	The 31 frames sit at the larger end of the Niigata four-stroke programme. Cylinder covers with valves and seats, liners, piston assemblies, connecting rod and main bearings, fuel injection equipment and camshaft components are the lines an overhaul list on this engine holds.
AFT · AFTE · 28AFTE	AFTE series	Niigata	Engines	The AFT and AFTE designations belong to the older Niigata programme and are still what the plates on board read. They are worth copying letter for letter: 28AFTE and 28BX are different engines, and a designation trimmed to the size figure alone does not separate them.
6L, 6M and MG prefixes	Type designation	Niigata	Engines	The leading figure is the cylinder count and the letters that follow separate the executions, MG marking the units supplied with the gear. A designation sent without them names a family rather than an engine, and the parts that differ between executions are exactly the ones an RFQ tends to be about.
E44 · E70B	Generator engines	Perkins	Engines	Auxiliary engines launched for generating sets on tugs, fishing vessels, ferries and inland vessels. The E44 is a four-cylinder engine and the E70B a six-cylinder one. Filters, coolant and sea water pump parts and gasket sets are quoted against the engine code and serial; the alternator is a separate line from its own plate.
E70-TAG	Generator engines	Perkins	Engines	The earlier generator engine from which the E70B was developed. A ship with both on board states which one each line is for, because the two engines are not assumed to share every part.
M130C · M135	Perkins Sabre, naturally aspirated	Perkins	Engines	Six-cylinder naturally aspirated propulsion engines of the Sabre family. Typical lines are the sea water pump impeller, anodes, heat exchanger elements and gaskets, fuel and oil filters and the drive belt, each checked against the code and serial.
M185C · M215C · M225Ti · M265Ti · M300Ti	Perkins Sabre, turbocharged	Perkins	Engines	Turbocharged and intercooled Sabre propulsion engines. The letters after the number mark the version and are copied exactly. Charge-air cooler elements, turbocharger gaskets and injector items come into these enquiries next to the cooling and filter lines.
M92B · M90 · 4.236	Perkins Sabre, four-cylinder	Perkins	Engines	The four-cylinder Sabre engine M92B and the engines it was built to replace, the M92, the M90 and the older 4.236. Many still work on small fishing vessels and launches; the plate and the old part are the starting point.
M175C · M200C · M245C	Propulsion, current range	Perkins	Engines	The six-cylinder propulsion range Perkins presented at Metstrade 2025. Parts for these engines are quoted against the full engine code and serial number, as for the older lines.
WAF · WF	Reverse reduction · fixed pitch	Reintjes	Engines	Hydraulically shifted ahead and astern gearboxes for fixed-pitch propellers on tugs, fishing vessels, inland vessels and ferries, WF being the small member of the line. Clutch disc sets, bearings, shaft seals and filter elements make up most requests.
WGF · ZWAF	Derived from WAF	Reintjes	Engines	WGF is a reverse reduction gearbox derived from WAF with an attached gear step in a flange-connected housing; ZWAF is the two-speed reverse reduction version. The extra step or second gear brings its own bearings and clutch items onto the list.
LAF · LF · LGF	Reduction · controllable pitch	Reintjes	Engines	Non-reversing gearboxes with a disc clutch for controllable-pitch propellers, where the blades reverse the thrust. Larger LAF sizes can carry a hollow output shaft with the connection for the CPP oil distribution box; clutch discs, bearings and oil-feed seals are the usual lines.
VA · SVA · SVAL · ZSVAL	Controllable pitch · VA line	Reintjes	Engines	Reduction gearboxes for controllable-pitch propellers on workboats and cargo tonnage. VA is the clutchless design on roller bearings, SVA keeps it clutchless on slide bearings, SVAL adds a disc clutch and ZSVAL is the two-speed version. On the slide-bearing frames, bearing shells and thrust items come up next to the clutch parts.
DLG	Twin input · single output	Reintjes	Engines	Twin input, single output reduction gearbox with hydraulically operated clutches, letting two engines drive one controllable-pitch propeller on workboats, ferries and naval and governmental vessels. Bearings are rolling or slide depending on size, so the plate decides which shells or races are asked for.
AF · EF · DUG	No main clutch · electric drive	Reintjes	Engines	Reduction gearboxes built without a hydraulically switchable main clutch for electric-drive propulsion, DUG being the twin-input version for ferries and workboats with electric drive. Bearings, shaft seals, filter elements and cooler items take the place of clutch work.
RDG · RDGL	Dredging duty	Reintjes	Engines	REINTJES Dredging Gearboxes for dredger pumps installed in ships and for underwater dredger pumps; RDGL carries a disc clutch, RDG does not. Bearings, seals and, on RDGL, the clutch pack are the recurring items.
WVS · WLS · VLJ	Aluminium housing	Reintjes	Engines	Weight-optimised families in aluminium-alloy housings for patrol, crew transfer and other high-speed craft, with VLJ as the reduction gearbox for waterjet propulsion. Clutch discs, bearings and housing seals are read against the exact suffix, since U-drive and offset variants differ.
PA4	PA series · earlier generation	SEMT Pielstick	Engines	An earlier PA generation still met as an auxiliary and on service craft. Cylinder heads, liners, piston assemblies, injection equipment and bearing shells are the usual lines, and the works that built the engine belongs in the request beside the type, because Pielstick designs were built under licence in several countries.
PA5 · 6 PA5L · 8 PA5L	PA series · PA5L	SEMT Pielstick	Engines	PA5L engines are met on Japanese-built tonnage, where Niigata built to the Pielstick licence, so the same engine is described under two maker names on board. Cylinder covers, valve spindles and seats, fuel injection pumps and injectors, connecting rod and main bearings are the recurring scope.
PA6 · PA6B · PA6 STC	PA series · later generation	SEMT Pielstick	Engines	The later PA6 builds carry their own suffix, and B and STC are separate executions rather than trim levels. Liners, piston crowns and rings, cylinder heads, exhaust valve assemblies, injection equipment and turbocharger interface parts are the usual lines; copy the suffix off the plate.
PC2 · PC2-5 · PC2-6	PC series	SEMT Pielstick	Engines	The PC2 line is the larger Pielstick family, and the figure after the dash separates generations that share a name but not every part. Cylinder covers, liner and piston sets, exhaust valve assemblies, fuel injection equipment, bearing shells and overhaul gasket sets are what enquiries on these engines ask for.
DI16 series	Scania DI16 · current V-configuration	Scania	Engines	Main propulsion on larger workboats, pilot boats, tugs and patrol vessels, and a heavy-duty auxiliary genset drive. Cylinder heads, piston and liner kits, turbocharger cartridges, fuel injection components; the full suffix-coded type from the plate decides the parts list.
DI13 series	Scania DI13 · current in-line	Scania	Engines	Fitted on pilot boats and fast workboats, and as a genset prime mover. Injection pump components, turbocharger service kits, water and oil pump repair kits, gasket sets by the complete suffix-coded type.
DI09 series	Scania DI09 · current in-line	Scania	Engines	The smallest engine in the current marine range, block shared with Scania's road engines. Starter motors, alternators, charge-air cooler elements, seal kits; the marine-specific type code confirms the application before parts are matched.
DI11 · DC11 · D11	Scania legacy in-line	Scania	Engines	An earlier in-line generation predating the current DI09/DI13/DI16 range, still met on older workboats and fishing vessels. Camshafts, valve-train components, cylinder head gasket sets — confirm the exact D/DC/DI prefix before quoting.
DI14 · DC14 · D14	Scania legacy V-configuration	Scania	Engines	An earlier V-configuration block that served the role the DI16 now fills. Piston assemblies, liner kits, turbocharger components — the prefix and suffix on the plate decide the parts list, not the displacement class alone.
DI9 · DC9 · D9 and DI12 · DC12	Scania legacy in-line	Scania	Engines	Older in-line blocks preceding today's DI09 and DI13 lines. Type plates on installations this old are often worn or painted over; read whatever prefix and digits remain carefully before a parts list is worked up.
Scania-Vabis nameplate	Maker identity	Scania	Engines	On genuinely old installations the plate may read Scania-Vabis rather than Scania — the company's earlier name, not a different manufacturer. The same identification rule applies: full designation and serial number read exactly as stamped.
VN2020	VISATRON VN2020 · suction type	Schaller Automation	Engines	The current suction-type VISATRON. Crankcase atmosphere is drawn from several measuring points along the engine through header pipes to one detector, where the measuring head reads its opacity; the detector has a pressure regulator unit and an LED display. Schaller presents it as the successor to the VN87plus and the VN93, made to connect to their pipework. The measuring head and the pressure regulator unit are ordered as lines of their own, by their labels.
VN301plus	VISATRON VN301plus · pipe-free	Schaller Automation	Engines	No suction pipework at all. Each sensor is screwed into the crankcase wall from outside and joined to a central unit by a hybrid cable; a large installation is split between two central units, one of them leading the other. A sensor, its wall fitting, its cable and the central unit are separate lines with separate labels.
VN115/87 · VN215/87	VISATRON VN87 · VN87plus	Schaller Automation	Engines	Two types of one family. On a VN115/87 the samples drawn from the crankcase compartments are collected in header pipes and the detector reads their combined opacity. A VN215/87 is a separate type of the same family with a parts list of its own, so the two are never read as one. Copy the type with any plus or EMC suffix exactly as the label shows it.
VN93	VISATRON VN93	Schaller Automation	Engines	An earlier suction-type series that Schaller names, together with the VN87plus, as a predecessor of the VN2020. A VN93 is quoted from its own labels and its own parts list only; nothing is taken over from the VN87plus or VN2020 lines.
Remote Indicator II	Engine control room indicator	Schaller Automation	Engines	The optional indicator that repeats the detector readings on the control desk in the engine control room. It carries a label of its own and is a separate line, apart from the detector or central unit on the engine.
CAT 3508	CAT 3500 Series	Caterpillar	Engines	8-cylinder V-form diesel, auxiliary and propulsion. Cylinder liner sets, piston assemblies, injector tips, turbocharger cartridges, gasket kits.
CAT 3512	CAT 3500 Series	Caterpillar	Engines	CAT 3512 RFQs can include piston rings, cylinder head gaskets, injector assemblies, water pump seals and valve sets. Confirm the complete engine identity and arrangement.
CAT 3516 · 3516B · 3516C	CAT 3500 Series	Caterpillar	Engines	The generation letter, the rating letter and the serial number together describe the engine; the B and C builds use electronically controlled unit injectors. Pistons and rings, cylinder liners, cylinder heads, unit injectors, turbocharger cartridges, bearing shells, jacket-water and sea-water pumps, gasket sets.
CAT 3606 · 3608	CAT 3600 Series	Caterpillar	Engines	Large-bore medium-speed main propulsion engines. Cylinder heads, piston crowns, exhaust valve assemblies, camshaft components, crankshaft bearing shells.
CAT 3612 · 3616	CAT 3600 Series	Caterpillar	Engines	High-power V-form main engines for large vessels. Fuel injection pumps, cylinder liner kits, charge air cooler elements, governor components, overhaul seal sets.
CAT C18	CAT C-Series	Caterpillar	Engines	Compact in-line six-cylinder diesel for auxiliary and propulsion. Cylinder head kits, injector assemblies, timing components, cooling circuit seals, gasket sets.
CAT C32	CAT C-Series	Caterpillar	Engines	High-speed marine diesel for fast craft and workboats. Injectors, turbocharger units, piston ring sets, water pump assemblies, heat exchanger elements.
MaK M 20 · M 25 · M 32	MaK (Caterpillar group)	MaK	Engines	MaK medium-speed engines built by Caterpillar Motoren in Kiel. Cylinder heads, liners, fuel injection equipment, turbocharger components and overhaul gasket kits — reviewed against the engine evidence supplied with the RFQ.
KTA19	Cummins K-Series	Cummins	Engines	KTA19 RFQs can include pistons, liners, cylinder heads, injectors, turbocharger components and gasket sets. Confirm the complete engine identity and installed configuration.
KTA38	Cummins K-Series	Cummins	Engines	V12 high-output marine diesel. Anchor handling tugs and platform supply vessels. Crankshaft bearings, connecting rods, exhaust valves, fuel pump assemblies.
KTA50	Cummins K-Series	Cummins	Engines	V16 top-output K-series engine. Heavy anchor handlers and large OSVs. Cylinder liners, piston ring sets, turbocharger cartridges, intercooler cores, overhaul kits.
QSB6.7	Cummins QSB Series	Cummins	Engines	QSB6.7 RFQs can include piston rings, injector nozzles, turbocharger components, gasket sets and cooling-system parts. Confirm model, serial and application evidence.
QSK19	Cummins QSK Quantum	Cummins	Engines	Quantum series with advanced fuel management. Cylinder heads, injector cups, valve seat inserts, camshaft followers, lube oil system components.
QSK38	Cummins QSK Quantum	Cummins	Engines	QSK V12 Quantum high-power engine. Piston assemblies, exhaust valve rotators, fuel injectors, turbocharger nozzle rings, cooling system spares.
QSK60	Cummins QSK Quantum	Cummins	Engines	Top-tier Quantum engine for high-power commercial vessels. Main bearings, piston crowns, cylinder liner sets, complete head assemblies, full overhaul kits.
QSM11	Cummins QSM Series	Cummins	Engines	QSM11 RFQs can include injectors, cylinder head gaskets, water pump assemblies, intercooler elements and seal kits. Confirm model, serial and application evidence.
DK-20e	Daihatsu DK Series	Daihatsu	Engines	DK-20e RFQs can include pistons, liners, cylinder heads, fuel pumps and injection valves. Confirm model suffix, serial/build and generator-set evidence.
DK-26	Daihatsu DK Series	Daihatsu	Engines	DK-26 RFQs can include cylinder liners, piston rings, exhaust valve assemblies, turbocharger nozzle rings and bearing shells. Confirm model suffix and serial/build evidence.
DK-28	Daihatsu DK Series	Daihatsu	Engines	DK-28 RFQs can include pistons, connecting rods, crankshaft bearings, fuel injection equipment and gasket sets. Confirm configuration, serial/build and part evidence.
DKM-36	Daihatsu DKM Series	Daihatsu	Engines	DKM-36 RFQs can include pistons, cylinder liners, exhaust valves, turbocharger parts and camshaft drives. Confirm installed duty, serial/build and part evidence.
DL-22	Daihatsu DL Series	Daihatsu	Engines	DL-22 RFQs can include cylinder heads, valve seat inserts, governor components, cooling-system spares and overhaul kits. Confirm serial/build and part evidence.
DL-26	Daihatsu DL Series	Daihatsu	Engines	DL-26 RFQs can include fuel injection pumps and plungers, turbocharger interface parts, piston crowns and cylinder head gaskets. Confirm installed duty and build evidence.
DS-26	Daihatsu DS Series	Daihatsu	Engines	DS-26 RFQs can include liners, valves and injection equipment. Confirm the complete model suffix, installed duty, serial/build and approved overhaul scope.
Ballast, bilge & fire line	Duty context	DESMI	Pumps	Ballast, bilge and fire-line installations where suction conditions are harsh and running is intermittent. Seal arrangement, priming provision and driver data must be stated with the pump identity.
Casing gaskets and covers	Static sealing	DESMI	Pumps	Casing gaskets, cover O-rings and drain plug seals are cheap to include and expensive to omit once the pump is open. They belong on the same RFQ as the rotating parts, listed against the same pump serial.
Coupling elements and alignment	Drive	DESMI	Pumps	Flexible coupling elements degrade with heat, oil contact and misalignment, and a worn element accelerates seal and bearing wear downstream. Note the coupling make, size and element type — the coupling is frequently not the pump maker's own part.
DSL series	Centrifugal · SL programme	DESMI	Pumps	Consult the plate — the SL designations separate suction and coupling arrangement, which changes the impeller, wear ring and bearing spares. Whether the unit in front of you is a double-suction build (no single suction-side wear ring, different impeller) has to be confirmed against the pump manual, not inferred from the three letters on the casing.
ESL series	Centrifugal · SL programme	DESMI	Pumps	Another SL designation separated by suction and coupling arrangement rather than by size. Seal face pairs, elastomer kits, impellers and rolling-element bearings recur on the line list, but an end-suction build brings its own bearing bracket, pump shaft and coupling spacer, so confirm the arrangement before a wear ring is matched.
Impeller erosion and cavitation	Hydraulics	DESMI	Pumps	Leading edges thin out and vane suction faces show pitting just behind the leading edge, often carrying into the shroud. Pitting there points to suction-side conditions — strainer, sea chest or NPSH — so a like-for-like impeller alone may not settle the fault. Where a bronze impeller runs in a cast iron casing, the casing and casing wear ring are the anodic parts and lose metal first: inspect the ring bore and casing faces, not only the impeller, and note any sacrificial anodes fitted in the covers and their condition. Record the trimmed diameter that came out, because it rarely equals the nominal diameter of the family.
Modular pump builds	Centrifugal · Modular	DESMI	Pumps	Pumps assembled from shared hydraulic, sealing and bearing modules. Identification depends on the module combination recorded on the plate and in the order documents, so the family name alone is not enough to fix a spare.
NSL series	Centrifugal · Vertical in-line	DESMI	Pumps	Single-stage vertical in-line centrifugal pumps bolted directly into cooling and general-service pipe runs, with the driver carried above the casing. The high-head variant (NSLH) carries a different plate designation and different hydraulic spares — read the plate rather than assuming NSL. Requests usually cover the casing wear ring, impeller, mechanical seal cartridge, shaft sleeve, motor stool/lantern and the seal chamber components. Long-coupled variants add a bearing bracket and coupling spacer — state which build is fitted, because the two carry different spares.
ROTAN internal gear pumps	Positive displacement · Internal gear	DESMI	Pumps	DESMI's ROTAN internal gear pumps on fuel oil, lube oil and viscous transfer duty, where a centrifugal would lose prime or shear the medium. Line items typically cover the rotor and idler set, idler pin and bushings, front cover and gasket, mechanical seal or packing set, and relief valve parts. State the bushing material with the request: a fuel-duty build and a sludge-duty build of the same frame size take different ones.
Seal faces and face pairing	Sealing	DESMI	Pumps	Seawater carries sand, silt and marine growth straight into the seal chamber. The pairing wears, weeping appears at the seal chamber drain and a salt crust builds on the lantern/motor stool below it. The face material combination and elastomer grade decide the replacement — the seal size alone does not.
Seawater cooling service	Duty context	DESMI	Pumps	Seawater pumps serving the central cooler and the SW cooling line, and the fresh-water circulating pumps on the closed jacket and low-temperature circuits. The two duties are built in different wetted materials, so the circuit must be stated with the pump identity: a bronze or duplex build cannot be replaced from a fresh-water parts list of the same nominal size.
Self-priming units	Priming	DESMI	Pumps	Self-priming pumps and separately mounted priming units on bilge, ballast and stripping duty. Vacuum unit elements, priming valves, non-return components and seal kits are requested as sets.
Shafts, sleeves and bearings	Rotating assembly	DESMI	Pumps	Fretting under the seal, corrosion at the sleeve shoulder and bearing housing bore wear usually surface together. When a shaft is ordered, state whether the sleeve, key, lock nut and bearing set are being renewed with it.
Wear ring clearance opening up	Clearances	DESMI	Pumps	As the casing ring and impeller neck ring lose their fit, recirculation grows and the pump quietly falls below its duty point while sounding mechanically healthy. Ring bore, ring width and the matching impeller neck dimension should be measured before the RFQ is sent.
12EC-24 · 16EC-24 · 16EC-24H	Cargo pumps · EC	Ebara	Pumps	Main cargo unloading pumps fixed in the cargo tank and bracketed to the pump tower; the maker notes that a tank on a liquefied gas carrier typically has two of them. 16EC-24H is listed as a high-flow cargo pump alongside 16EC-24, so a request that drops the final letter describes a different pump.
2EC-12	Spray and stripping pumps · EC	Ebara	Pumps	A fixed in-tank pump that sprays LNG onto the inside top of the cargo tank to keep it cold and reduce boil-off, and takes the tank down to its minimum liquid level; the maker adds that spray pumps are often used for product recirculation. Its very low suction-head requirement rests on the inducer, so inducer condition is worth describing whenever one of these pumps is opened.
1EC-063 · 1.25EC-082 · 1.25EC-083 · 1.5EC-092	Fuel gas pumps · EC	Ebara	Pumps	Low-flow, high-head pumps that feed LNG to the engines. The maker says it developed the first dedicated LNG fuel gas pump for LNG carriers more than three decades ago, and it now offers fuel gas pumps for fuel gas supply systems and LNG fuel tanks on LNG-fuelled ships. 1.25EC-082 and 1.25EC-083 share a size figure but are listed as two-stage and three-stage versions, so the last digits are not optional.
8ECR-12	Emergency cargo pump · ECR	Ebara	Pumps	A retractable back-up pump, lowered down a column and seated on the foot valve to empty a tank if both of its cargo pumps fail. The maker lists its accessories as a set of their own: foot valve, cable support system, headplate, deck junction boxes and storage containers.
8EC-12	Bunkering cargo pumps · EC	Ebara	Pumps	Smaller-capacity cargo pumps for LNG bunkering vessels and barges, fixed in membrane or C-type tanks. The maker's bunkering sample curve is drawn for an 8EC-12 run from a low-voltage AC drive, which lets the speed be reduced to take the tank down to a low level. The drive is paired with the motor to give the pump curve, so the drive model belongs on the request as well.
1.25ECC-085	Suction-vessel pumps · ECC	Ebara	Pumps	An ECC pump sits inside its own suction vessel, built to the applicable pressure vessel code, which serves as the outer pump casing. The maker uses this arrangement for high-pressure send-out on FSRUs, and its brochure shows the variable-speed CRYO-Fuel fuel gas pump as 1.25ECC-085. On floating units vessel-mounted pumps get additional lateral supports; those belong to the installation rather than to the pump.
OnlineVac	Online vacuum units	Evac	Pumps	Liquid ring pumps V16 and V26, mechanical seals, bearings and macerating parts
EasyVac	Online vacuum units	Evac	Pumps	Liquid ring pump, seals, bearings and macerating parts; unit sold in the Asia-Pacific market
OnlineFlex FX · 2FX	Lobe-pump vacuum units	Evac	Pumps	Lobe pump items and the retrofit pump sets offered for older installations
EasyFit	Ejector vacuum units	Evac	Pumps	Driving pump, ejector and component kit items
CR	Vertical multistage · CR	Grundfos	Pumps	Grundfos describes CR pumps as multistage in-line pumps, and its marine range lists them for fire and general service, boiler feed, thermal oil, freshwater generator and freshwater cooling duty. The hydraulic end is a stack of chambers and impellers between base and pump head, with neck rings in the chambers and a bearing ring in some of them. Enquiries centre on the shaft seal, chamber-stack parts, the coupling and the O-rings.
CRN	Stainless multistage · CRN, model GS	Grundfos	Pumps	The CRN keeps every part in contact with the pumped liquid in stainless steel. For marine and offshore service Grundfos offers the model GS, in which the parts outside the liquid are upgraded to stainless steel as well. The CRN is built in several material variants, among them G, GI, GX and GS, so the material code in the designation is copied with the rest of the line.
CRT	Titanium multistage · CRT	Grundfos	Pumps	The titanium member of the CR family, which Grundfos lists for scrubber cooling and ejector pump duty in the engine room and describes as suitable for seawater. Grundfos covers a CRN and a CRT of the same size in one set of service instructions, so the range letters, not the frame size, tell the materials apart, and a chamber or a seal is never matched on size alone.
NB · NBG · NK	End-suction · NB/NK	Grundfos	Pumps	NB and NBG are single-stage volute pumps with an axial inlet and a radial outlet; Grundfos groups them with the NK as end-suction pumps for freshwater cooling and HVAC on board, in cast iron and duplex steel. NB complies with EN 733 and NBG with ISO 2858. Impellers, wear rings, shaft seals and pump-cover O-rings are the recurring lines, and the material code in the designation sets what the impeller and the wear ring are made of.
TP · TPD	In-line · TP	Grundfos	Pumps	Close-coupled in-line pumps with a rigid shaft, which Grundfos lists for freshwater cooling and HVAC service on ships. TPD is the twin-head version, so the request states which head the parts are for. The pump plate prints the actual impeller diameter, and an E after the range letters, as in TPE, marks an electronically speed-controlled pump.
CM · Hydro MPC · SEG · SEV · DDE · DME	Utility systems	Grundfos	Pumps	The marine range also reaches utility systems: CM pumps on freshwater generator and chilled water service, Hydro MPC booster sets, SEG and SEV sewage pumps and the DDE and DME digital dosing pumps. For a booster set or a dosing system, send the system designation together with the plate of the unit that has failed.
HL-CONT Compact	Sewage treatment plant · smallest range	Hamann	Pumps	The maker's smallest flotation plant, built in one size, 0125, in two layouts: A as delivered, B for minimum depth such as wall mounting. A macerator is an option, since most toilet systems on vessels of this size already macerate.
HL-CONT Plus	Sewage treatment plant · main range	Hamann	Pumps	The all-round flotation plant in sizes 0125, 025, 05, 10, 20, 40 and 80, built in a standard IMO/EU-MED/UK-MER execution and a USCG execution. It can be delivered dismounted for assembly on board, and a macerator is part of the plant from size 05 upwards.
HL-CONT Plus OceanCruise	Advanced wastewater treatment · ocean	Hamann	Pumps	Two flotation units with two moving bed biofilm reactors between them, installed as four separate modules that can sit on different decks. Built for discharge in the Baltic Sea special area and in Alaskan waters; ship's tanks may be converted into the reactor modules.
HL-CONT Plus RiverCruise	Advanced wastewater treatment · inland	Hamann	Pumps	Two flotation units and one moving bed biofilm reactor in three separate modules, certified for inland waterway vessels under Commission Directive 2012/49/EU and to ES-TRIN.
TS Compact · TS Plus	Sewage tanks · transfer	Hamann	Pumps	Pumps, motor-operated valves and level sensors run from a control cabinet that move grey water into the sewage mixing tank: one way on TS Compact, and on TS Plus also between holding tanks and overboard, with a touch display showing the level of every tank.
TA BW · TA SL · TC	Sewage tanks · conditioning	Hamann	Pumps	Tank aeration by air blower for black water (BW) and sludge (SL) holding tanks against hydrogen sulphide, and tank circulation (TC) that keeps the sludge tank pumpable, run together with a HAMANN discharge system.
DS Compact · DS Plus · VS	Discharge and vacuum	Hamann	Pumps	Discharge systems in single or dual pump setups, DS Plus with discharge rates programmed to the vessel's discharge table; and VS vacuum systems built on a frame around Jets or Evac vacuum generators, so the generator is identified under its own maker's name.
T03 · T03U · T03DU	Taper spring	AESSEAL	Mechanical seals	The T group is the taper spring family, and the letters after the figure are the execution rather than a size. A seal is quoted from the shaft diameter, the face and seat materials, the elastomer and the housing dimensions together, so the code alone is a starting point and not the order.
T04 · T04 MONO · T04D	Taper spring	AESSEAL	Mechanical seals	T04 is an O-ring mounted taper spring seal with a pressed head, and the MONO and D forms are separate builds. State which is fitted along with the seat type, because the rotary and the stationary halves are ordered as a pair.
W01 · W01U · W02 · W02U	Wave spring	AESSEAL	Mechanical seals	The W group is the wave spring family, chosen where axial space is short. Requests cover the complete seal, the stationary seat and the elastomer set; a wave spring build does not drop into a taper spring housing even at the same shaft size.
MG1 · MG12 · MG13 · eMG1 · eMG12 · eMG13	Elastomer bellows	EagleBurgmann	Mechanical seals	The MG group is the elastomer bellows family, and MG12 and MG13 are the MG1 with a progressively longer bellows tail, MG12 reaching the fitting length coded l1k and MG13 the length coded l1N under EN 12756, so the number matters as much as the letters. The maker gives the newer eMG bellows as a one-to-one replacement for the older one, and both spellings turn up on requests.
M7N	Pusher seals	EagleBurgmann	Mechanical seals	A pusher seal ordered as a rotary unit with its stationary seat. The face and seat material pair, the elastomer grade and the spring execution are all part of the identity, and a photograph of the removed seal saves a round of questions.
H7N · H12N	Pusher seals	EagleBurgmann	Mechanical seals	Two pusher builds from the same programme, met on pump duty across the engine room. The seat form differs between them, so the stationary half belongs in the request rather than being assumed from the rotary code.
HJ92N · HJ977GN	Pusher seals	EagleBurgmann	Mechanical seals	Longer codes from the same family, where one transposed character reaches a different seal. Copy the marking from the seal or from the pump documentation as it stands, and note the shaft size measured rather than the one in the manual.
Burgmann and EagleBurgmann on the same seal	Designation reading	EagleBurgmann	Mechanical seals	Seals in service carry the older Burgmann name and the current one, and the type codes did not change with it, so both spellings identify the same part. What does change a seal is the fitting length: a code taken from a European housing standard is quoted against that length, and a housing measured in place settles it.
Type 1 · Type 1A · Type 1B · Type 2	Elastomer bellows	John Crane	Mechanical seals	The oldest and most widely met of the elastomer bellows types, Type 1 being a full-convolution bellows seal with a non-clogging single-coil spring and Type 2 offered in single, double and balanced arrangements. The arrangement is part of the request: a double build changes the gland and the flush connection, not only the seal.
Type 6 · Type 502	Elastomer bellows	John Crane	Mechanical seals	Two elastomer bellows types met across pump duty. The rubber part is the element that ages in place, so state the medium and the temperature context in words rather than leaving the elastomer grade to be guessed from the type number.
Type 21 · Type 2100	Elastomer bellows	John Crane	Mechanical seals	Type 21 is the general-duty seal, its drive band using a dent-and-groove pattern, and Type 2100 is fully unitised and heavy-duty, its bellows pressure-supported so it will not crease. Both sit in the elastomer bellows family; the cartridge types on the John Crane page are the 5610 group, 4610 and the 648 series.
Type 58 · Type 58B · Type 58U · Type 59 · Type 59B · Type 59U	O-ring pusher and PTFE wedge	John Crane	Mechanical seals	The 58 and 59 groups are multi-spring DIN-length seals, with an elastomer O-ring on the 58 group and a PTFE wedge on the 59. In both, the B and U letters separate the balanced and unbalanced builds. That letter decides the part, so a request reading only Type 58 has to be reopened.
Type 109	PTFE wedge	John Crane	Mechanical seals	A shaft-mounted multi-spring wedge seal with PTFE or graphite-based wedges. Requests cover the rotary unit, the stationary seat, the wedge rings and the drive collar; the seat is frequently the half that is missing when a seal is reassembled from stores.
Type 606 · Type 609	Metal bellows	John Crane	Mechanical seals	Metal bellows seals for hot duty, where there is no dynamic O-ring to hang up or wear the shaft. The bellows is the part that fatigues, so send the service it ran on and whether the failure was a leak or a break, since the two point at different components.
Type 12	Stationary seat	Vulcan	Mechanical seals	Type 12 is a stationary seat rather than a complete seal, and it is supplied as standard with several of the rotary heads. That is worth knowing before ordering: a request for a Type 12 alone replaces the seat and leaves the head in service.
Type 18	Conical spring	Vulcan	Mechanical seals	An O-ring mounted conical spring seal whose fitting depends on the direction of rotation, supplied as standard with a stainless head and a carbon seat to suit non-standard housings. Note the direction of rotation in the request; on this type it is not a detail.
Type 20	Parallel spring · rubber diaphragm	Vulcan	Mechanical seals	A rubber diaphragm mounted parallel spring seal with a self-adjusting head that takes up minor misalignment and run-out. It works in both directions of rotation, so where a Type 18 has been mixed up with a Type 20 on board, the direction question is what separates them.
Type 24	Diaphragm bellows · EN 12756	Vulcan	Mechanical seals	A diaphragm bellows build made to the European seal chamber dimensions, with a boot-mounted stationary that seats against the housing face. The stationary is part of the assembly, so order the pair.
Type 75	Head style	Vulcan	Mechanical seals	Type 75 names a head style in the maker's own coding rather than a complete seal, and the same coding cross-references it to the American designations a buyer may have been given. Send both the code you hold and the shaft size measured.
Type 1724 · Type 1724L	Elastomer bellows · EN 12756	Vulcan	Mechanical seals	A radially compact elastomer bellows seal with a positively driven face and a non-clogging spring, supplied with the Type 24 boot-mounted stationary and built to the European chamber dimensions. The L form is a separate build, so the letter belongs in the request.
BS-420 · BC-420	AutroSafe 4 · panels	Autronica	Gas detection	The BS-420 fire alarm control panel is the main control panel of AutroSafe 4 and can also run a stand-alone system. The BC-420 is the controller of the same system, a separate unit that connects detection loops and input and output modules. Panel fronts, loop driver modules, input and output modules and power supply parts are the usual lines, each read against the panel label and the software version the panel shows.
BS-310 · BS-320	AutroSafe · earlier panels	Autronica	Gas detection	Fire alarm control panels of an earlier AutroSafe version, still met on board. Which of the two is fitted is read from the panel label, and a part for either is quoted from that label and its own parts list; nothing is carried over from the BS-420 line on an assumption.
Autroprime	Autroprime · small-to-medium vessels	Autronica	Gas detection	Autroprime is the Autronica fire detection system for small-to-medium sized vessels. The panel recognises the detectors and other loop units connected to its loops by itself, so a replaced unit is identified by its label and by its place on the loop. Panel parts, loop units and bases are the usual lines.
BS-100	BS-100 · earlier generation	Autronica	Gas detection	A fire detection system of an earlier Autronica generation, still met on older ships. Refits from BS-100 to AutroSafe 4 have kept many of the detectors and loops already installed and changed the panels, so the same ship may carry old loops under a new panel. The enquiry has to say whether the loops still run on the BS-100 panel or already under AutroSafe.
BDH · BHH detectors	Point detectors · 200, 300 and 500 series	Autronica	Gas detection	Point detectors for AutroSafe and Autroprime loops carry BDH for heat and BHH for optical smoke and multisensor versions. The 300 and 500 series have SelfVerify, and suffixes such as /EX and /N mark versions for hazardous areas. The full type with every suffix comes from the detector label; a hazardous-area version is never quoted as a standard one.
AutroGuard Retro (/SPARE)	AutroGuard Retro · spare detectors	Autronica	Gas detection	For AutroSafe detectors the maker now offers AutroGuard Retro variants: the original type with /SPARE added, so a BHH-300/SPARE stands for a BHH-300. They mount on the existing base, but only with panel software versions the maker lists and not in every kind of base. That is why the base label and the software version come before the price.
BWA-100 · BBR-130 · BBQ-130	Bases and base sounders	Autronica	Gas detection	The BWA-100 is the base under AutroSafe and Autroprime detector heads. The BBR-130 combines a detector base with an addressable sounder, and the BBQ-130 adds an alarm indicator to that sounder. A base or base sounder is quoted from its own label, and the detector above it is a separate line.
BG-201	AutroFlame · flame detectors	Autronica	Gas detection	AutroFlame flame detectors such as the BG-201 infrared detector sit on the same system, and the AutroSafe or Autroprime panel sets their performance mode. A flame detector is quoted from its own label and with the loop and address it holds, never as a substitute for a smoke or heat detector.
CS3000	Analogue addressable	Consilium	Gas detection	The computerised analogue addressable system in which detectors and loop units sit on addressed loops. Many ships still run it. Panel boards, loop units, detectors and bases are matched to the system and to the label on each unit.
CS4000	Analogue addressable	Consilium	Gas detection	The later analogue addressable system, in which every loop unit can raise a fire alarm on its own. Detectors listed for the CS4000 include optical smoke, heat and intrinsically safe types; each line names the type from the label and the system it belongs to.
Salwico Cargo	Cargo ships	Consilium	Gas detection	The Salwico fire detection central for cargo ships, built to the SOLAS rules. Detectors and call points are quoted against the central and the label of each unit, because a detector listed for one Salwico system is not assumed to fit another.
Pac series	Portable single-gas · Pac series	Dräger	Gas detection	Pac 3500, Pac 5500, Pac 6000, Pac 6500, Pac 7000 and Pac 8000 cover single-gas duty, from a quick check before a space is entered to a personal monitor worn through a watch. The model matters more than it looks: Pac 5500, Pac 7000 and Pac 8000 are lifetime instruments with a replaceable battery and a replaceable sensor, while the Pac 3500 is a fixed-life sealed device.
PIR 7000, Regard panels and Draeger-Tubes	Sensor heads, panels and tubes	Dräger	Gas detection	PIR 7000 point infrared sensor heads serve fixed detection points, and Regard 3900 and Regard 7000 control panels are what the Polytron transmitters feed into. Alongside all of the electronics sits the colorimetric Draeger-Tubes system with the accuro hand pump — more than 500 substance tubes, no power required, usable in Ex areas.
Polytron 7000	Universal transmitter	Dräger	Gas detection	The Polytron 7000 is a universal transmitter supporting 4-20 mA, HART, PROFIBUS and FF outputs. On a replacement enquiry the output type matters as much as the sensor, because the transmitter has to talk to a panel that was wired years earlier and will not be rewired for a spare.
Polytron series	Fixed transmitters · Polytron series	Dräger	Gas detection	Polytron 3000, Polytron 5100 EC and Polytron 6100 EC WL cover electrochemical duty for toxic gases and oxygen; Polytron 5200 CAT covers flammables on the catalytic principle; Polytron 8100 EC and Polytron 8700 IR sit at the upper end. The suffix is not decoration — it names the measuring principle, and therefore the sensor that can be fitted.
Sampling a space from outside it	Pump-capable sampling	Dräger	Gas detection	X-am 7000 and X-am 8000 are pump-capable with hose runs up to 45 m, which is what allows a tank or cargo hold atmosphere to be drawn out and read before anyone goes in. That capability brings its own consumables: pump units, sampling hoses, probes and adapters, none of which are recoverable from the instrument model name alone.
X-am series	Portable multi-gas · X-am series	Dräger	Gas detection	X-am 2500, X-am 2800, X-am 5000, X-am 5600, X-am 7000 and X-am 8000 read several gases at once, which is what an entry permit normally asks for. Sensor fit varies between instruments of the same model, so the gases actually configured have to come with the request rather than be assumed from the model name.
Approvals across five societies	Class type approval	Fukui	Valves	Fukui valves are documented as type-approved by LR, BV, DNV GL, ABS and ClassNK. Which society issued the certificate for the valve in front of you is worth stating in the enquiry, because the survey the overhaul is attached to, and the record the ship has to keep afterwards, follow that certificate rather than the valve body alone.
ClassNK hydrogen work	Liquefied-hydrogen carriers	Fukui	Valves	Fukui signed a memorandum of understanding with ClassNK in 2023 covering safety valves for hydrogen dual-fuel engines and liquefied-hydrogen carriers, and type approval under that work was issued in 2025. For a buyer the practical point is that hydrogen-side valves carry a documentation trail to reference when the valve is opened.
Engine-room pressure relief	Engine-room service	Fukui	Valves	Engine-room relief duty is the second documented application. These valves sit on machinery-space systems rather than on cargo, and they are usually opened as part of a planned overhaul rather than after an incident, which is why requests for them tend to arrive as kits and inspection spares rather than as single emergency items.
Pilot-operated safety and relief valves	Pilot-operated principle	Fukui	Valves	In a pilot-operated valve the setting is held by a small pilot rather than by a large spring bearing directly on the main disc. The pilot senses system pressure and controls the loading on the main valve, which is what allows the valve to stay tight close to its setting and then open decisively. It also means the pilot, not the main body, is the part most often on an enquiry.
PSL-MD low-pressure type	Liquefied-gas cargo tanks	Fukui	Valves	The PSL-MD is Fukui's low-pressure pilot-operated type for liquefied-gas cargo tanks. Cargo tank protection sits in a narrow band: the valve has to hold tight against normal tank pressure and still relieve without hesitation, so the condition of the pilot, the seat and the soft seals matters more here than raw size does.
Ultra-high-pressure relief valves	Hydrogen dual-fuel	Fukui	Valves	Fukui also develops ultra-high-pressure relief valves for hydrogen dual-fuel engines. This is newer equipment on a small number of vessels, and enquiries around it are best handled with the valve identity and the system it serves stated in full, since the installed base is not yet something a buyer can assume anything about.
NRG 16-50 · NRS 1-50	Water level limiters	GESTRA	Valves	The NRG 16-50 level electrode works with the NRS 1-50 level switch as a water level limiter for steam boilers, including on seagoing vessels. Electrodes, electrode tips, switch units and their gaskets are quoted as a matched pair, against the codes on both.
UNA 45 · UNA 46	Ball float traps	GESTRA	Valves	Ball float steam traps that remove condensate from steam and compressed air lines; versions carry a connection for a monitoring sensor. Regulators, float and valve assemblies, covers and gaskets are quoted against the full type and body marking.
BK 45 · BK 46	Bimetallic traps	GESTRA	Valves	Thermovit bimetallic traps for condensate removal from heating processes where the load changes little. Regulator inserts and gaskets are matched to the type on the body.
RK 86 · RK 86A · RK 16A · RK 41	Non-return valves	GESTRA	Valves	Disco non-return valves, most of them wafer designs fitted between flanges, with springs offered for different closing pressures. A valve without a spring is installed only in a vertical line with upward flow, so the fitting position belongs in the enquiry along with discs, springs and seats.
Reflex and transparent level gauges	Level gauges · reflex, transparent, bi-colour	Klinger	Valves	KLINGER level gauges show the liquid level in boilers and vessels through flat glass. A reflex gauge has one grooved glass, with the liquid dark and the steam space bright; a transparent gauge holds the medium between two plain glasses; a bi-colour gauge shows steam and water in two colours. The gauge type decides the spare: the glass, its gaskets and, on a transparent gauge, the mica shields.
KLINGERSIL C-4400	KLINGERSIL · aramid fibre with NBR	Klinger	Valves	The general-purpose KLINGERSIL grade: aramid fibres bound with NBR rubber, used on oil, fuel, water, steam and gas joints, and bought as sheet or as cut joints. A request names C-4400 because that is the grade on the drawing or printed on the old sheet, and another grade is not put in its place without saying so.
KLINGERSIL C-4430	KLINGERSIL · synthetic and glass fibre with NBR	Klinger	Valves	A KLINGERSIL grade of synthetic and glass fibres bound with NBR, which KLINGER offers for hot water and steam as well as oils and fuels; bought as sheet or as cut flange joints. Its number is close to C-4400 and the two are easy to mix up on a requisition, so the line copies the grade exactly as printed, including any word after the number.
TEA · TE series	Thermostatic expansion valves	Danfoss	Valves	TEA is the cast-iron, weld-flange ammonia line; TE covers HFC and HCFC refrigerants with an exchangeable orifice sized to the duty rather than the valve body. The two bodies are not interchangeable, so state which line and orifice size is fitted.
KP · RT · CAS · KPS series	Pressure and temperature switches	Danfoss	Control, governors and switchgear	KP covers general low/high pressure protection, RT the wider thermostat and pressure-switch range, and CAS and KPS are the marine-rated lines built for vibration and shipboard service. State which range is fitted before a switch or reset element is quoted.
HFJ7	HFJ synchronous generators	HD Hyundai Electric	Control, governors and switchgear	Hyundai's alternator literature offers an HFJ7 series for marine use, and genset listings show HFJ type lines on Hyundai alternators coupled to marine medium-speed engines, for example HFJ7710-10P behind a MAN 6L27/38. The figures and letters after HFJ7 belong to the type: copy them in full, with the serial number, because rotor, bearing and terminal box items are listed against that exact machine.
HIMAP-FI · HIMAP-T · HIMAP-M	HIMAP digital protection relays	HD Hyundai Electric	Control, governors and switchgear	HIMAP is the Hyundai digital protection relay family used in switchboards for generator, transformer and motor feeders. A relay setting report for a ship's main switchboard lists HIMAP-FI, HIMAP-T and HIMAP-M units, and surplus and marine automation traders offer the same types as spares. The suffix after HIMAP names the function, so the label on the front of the unit decides the line.
Hyundai Heavy Industries	Maker name on older documents	HD Hyundai Electric	Control, governors and switchgear	The electrical business started in 1977 as a division of Hyundai Heavy Industries and became a separate company through a spin-off in 2017. Manuals, drawings and relay documents from before that date can carry the Hyundai Heavy Industries name for equipment that belongs on this page.
PRIAMOS I, II and III — DC 1-03 and DC 1-04	Digital governor · PRIAMOS	Heinzmann	Control, governors and switchgear	Control units paired with StG 16/30/40, StG 64/90 or StG 180 actuators; replaced by XIOS UC but still listed by the maker as a replacement device and spare part.
XIOS UC Marine	Digital governor · XIOS	Heinzmann	Control, governors and switchgear	Modular control named by the maker as the follow-up product for PRIAMOS; quoted with the actuator it drives and the engine it controls.
HELENOS DC 2-02 and PANDAROS DC 6	Digital governor · HELENOS, PANDAROS	Heinzmann	Control, governors and switchgear	Control units quoted with the variant number and the actuator each variant is paired with.
StG 16/30/40, StG 64/90 and StG 180	Electric actuator · StG	Heinzmann	Control, governors and switchgear	Complete actuators and overhaul items: bearings, gear parts and seals, plus plugs and the feedback board when worn.
RE 1115-4G, RE 1800-3G and RE 1500-3G	Hydraulic governor · Regulateurs Europa	Heinzmann	Control, governors and switchgear	Hydraulic governors from the HEINZMANN Group; the RE 1115-4G is described by the maker for marine propulsion engines.
RE 2800 and DG 2800.14 II	Electro-hydraulic · Regulateurs Europa	Heinzmann	Control, governors and switchgear	Proportional fuel-control actuator with its own oil pump, run from a Viking control or, as the DG 2800.14 II, with a Heinzmann DC 14.
LSAM	Marine alternators	Leroy-Somer	Control, governors and switchgear	LSAM is the name Nidec uses for its Leroy-Somer marine alternators, and machines with LSAM plates also change hands in the used-equipment trade. Whatever follows the letters on the plate belongs to the type. Copy the whole line together with the serial number, because the spares are drawn up for that machine.
LSA 47.2 · LSA 49.3	LSA industrial alternators	Leroy-Somer	Control, governors and switchgear	LSA is the industrial range. Nidec notes that LSA machines also serve aboard ships next to their LSAM variants, and a marine spares trader lists the LSA 47.2 among ship alternators. Two examples are named here. Any LSA plate is read the same way, from the complete type line rather than the first figures.
R230 · R438 · R448 · R450	Analogue voltage regulators	Leroy-Somer	Control, governors and switchgear	Four analogue regulator types that appear in Leroy-Somer documents and are sold by independent alternator-parts traders. Each is its own design with its own terminal layout. The quote follows the type printed on the regulator in place and the excitation arrangement of the alternator, and the wiring is compared with the machine's diagram before a unit is changed.
D350 · D550	Digital voltage regulators	Leroy-Somer	Control, governors and switchgear	Digital regulators that Nidec lists for LSA alternators, for SHUNT, AREP or PMG excitation. If the ship's machine already has one, the D type on its label and the alternator serial number are the basis of the quote. Where a D type is proposed in place of a fitted R type, the change is worked out from the alternator documents and written into the quote, never offered as a direct swap.
SHUNT · AREP · PMG	Excitation arrangement	Leroy-Somer	Control, governors and switchgear	The three excitation arrangements Leroy-Somer alternators are built with. With AREP the regulator takes its supply from auxiliary windings in the stator, with PMG from a permanent magnet generator; SHUNT is the third arrangement. Which regulators can work on the alternator depends on it, so it is read from the alternator documents before any AVR is priced.
ECP34	ECP alternators	Mecc Alte	Control, governors and switchgear	ECP34 heads several versions in the maker's own web catalogue, and a generating set sold at a public auction was recorded as ECP34-2L/4. Characters after the frame number change the version: send them, and the serial, exactly as stamped.
ECO40	ECO alternators	Mecc Alte	Control, governors and switchgear	Parts and options for ECO40 frames are offered in the maker's catalogue, and trade press reported that the ECO40-C version brought a new permanent magnet generator system. Because that system is an option, two ECO40 machines need not share an excitation build; the full type and serial settle it.
DSR	Digital voltage regulator	Mecc Alte	Control, governors and switchgear	Mecc Alte's own catalogue lists the DSR as a digital AVR, and alternator-parts traders sell digital units under the DSR name for Mecc Alte sets. Whether a unit on offer is the maker's own is part of what its supplier is asked to show.
DER1	Voltage regulator	Mecc Alte	Control, governors and switchgear	A second regulator type in the maker's catalogue, sold beside the DSR and listed by traders as a DER1 for Mecc Alte generating sets. The label on the unit in the terminal box says which of the two is there; a change from one to the other is never treated as a plug-in swap.
C-Type	Series name on plates	Mecc Alte	Control, governors and switchgear	Some ECP34 versions carry C-Type in the maker's product name, and trade press described the C-Type series as a new design approach. When the plate or the manual shows C-Type, those words go into the enquiry next to the type line.
PMG	Excitation option	Mecc Alte	Control, governors and switchgear	The maker offers a permanent magnet generator kit for ECO40 machines, and trade press noted that the PMG system of the ECO40-C can be added as an option. Whether this machine has one is read from its documents, because it changes what feeds the regulator.
M-800-VII	Bridge manoeuvring system · current	Nabtesco	Control, governors and switchgear	Launched in 2022 as the successor to the M-800-V, it controls the main engine from the bridge or the engine control room, sends the speed order and monitors engine condition. The maker describes it as bringing remote control, condition monitoring and controllable pitch propeller control into one system, with network functions and LCD screens. Requests concern the display units, the modular units behind them, the power supplies and the telegraph handle.
M-800-V	Bridge manoeuvring system · modular	Nabtesco	Control, governors and switchgear	The generation the M-800-VII was built on. Nabtesco's maintenance notice states that from the M-800-V onwards the electronics are distributed modules, so a single board cannot be changed: the CPU, RPM, SHD, HUB or TB unit is replaced whole. Quote the unit label rather than a board number, and send a photograph of the unit in its cabinet.
M-800-II	Bridge manoeuvring system · earlier	Nabtesco	Control, governors and switchgear	Put on the market from 1995 to 2003 and built from individual boards. Many of its integrated circuits have gone out of production; the maker has been redesigning boards and testing substitutes, and in 2025 advised owners who intend to keep the ship trading to plan a change to the M-800-VII at a scheduled docking. For some engine types, the PC and RTA among them, it may offer instead a conventional system that it can still build.
MT-800-VII · MT-800-V · MT-800-VII TWIN	Telegraph handles	Nabtesco	Control, governors and switchgear	The transmitter and receiver handles that carry the main engine speed order; the TWIN version is the maker's handle for twin-engine installations. An optional electric shaft system keeps several handles in step, the port and starboard wing handles included. Earlier MT-800 and MT-800-II telegraph boards are on the maker's upgrade list for products long out of production.
NMW · NMWS · MWP · NC-1 · NC-3 · H-2 · HC-2 · HD-2 · NMA · NME	Wing, pneumatic and electric handles	Nabtesco	Control, governors and switchgear	NMW, NMWS and MWP are the bridge wing handles. NC-1, NC-3 and NMA are listed as pneumatic handles and NME as an electric one, while H-2, HC-2 and HD-2 appear in both a pneumatic and an electric version, the electric one typed H-2-P. Wing handles work in a harsh environment and are prone to rust, and the maker recommends replacing them complete at intervals that depend on their exposure; take the type letters from the handle itself and say whether it is pneumatic or electric.
EAR-120 · Governor Control Unit · MG-800	Electronic governor	Nabtesco	Control, governors and switchgear	The electric governor system holds the main engine at its set speed, choosing control parameters and operating mode to suit the conditions, and an optional specification tolerates some speed fluctuation within preset conditions to hold back excessive fuel injection. The maintenance notice names the MG-800 electronic governor system and its parts: CPU board and power supply, the servo driver for the actuator drive unit, the governor actuator and the control unit display. Earlier EAR-500 and EAR-1000 governors and MCG-100, 200, 300, 402 and 700 control units are listed for upgrade, with a governor control unit carrying the FUEL SAVE MODE offered as an option.
FIVA I · FIVA II · ELFI-V1 · ELFI-B2 · ELVA	Hydraulic valves on ME engines	Nabtesco	Control, governors and switchgear	One valve per cylinder. On Everllence ME engines the FIVA controls injection timing and quantity together with exhaust valve timing; the ELFI and the ELVA, also one per cylinder, split those duties between fuel injection and the exhaust valve. Nabtesco states that it supplies complete valves under a licence agreement with MAN, and its own notice lists them under FIVA-H, ELFI-V and ELFI-B designations. The pilot valve, the stroke sensor and the overhaul consumables are separate lines from the complete valve.
BWM · BTM · LWM · WIO sensors	Engine sensors	Nabtesco	Control, governors and switchgear	Bearing wear monitoring on the main, crankpin and crosshead bearings of two-stroke engines, bearing temperature monitoring, liner wall temperature monitoring and a water-in-oil sensor, together with the position sensors that follow fuel injection pump and exhaust valve stroke on MAN low-speed electronic engines. Give the sensor type and the bearing or cylinder it serves.
HCM634	STAMFORD frame on marine sets	STAMFORD \| AvK	Control, governors and switchgear	Cummins pairs the HCM634 with one of its marine engines in its own alternator matching, and a machine with an HCM634J2 plate has been offered, with its own photographs, in the used-equipment trade. The letters and figures after 634 are part of the type. The parts list belongs to one machine, so the full plate line travels with the serial number.
MX341 · MX321	PMG-powered regulators	STAMFORD \| AvK	Control, governors and switchgear	Both draw their power from a permanent magnet generator (PMG) rather than from the main winding, yet they are separate regulators with separate wiring. On a machine with a PMG, the type printed on the fitted label decides which of the two is priced.
SX440 · AS440	Self-excited regulators	STAMFORD \| AvK	Control, governors and switchgear	Both are self-excited: they are supplied from the alternator's main winding, with no PMG in the circuit. Traders sell the SX440 for machines with Newage Stamford plates, and the AS440 appears in the maker's own AVR list. Going from a self-excited type to a PMG-powered one, or back, changes the excitation wiring and is planned from the documents.
DIG 110 · DIG 120 · DIG 130	AvK alternators	STAMFORD \| AvK	Control, governors and switchgear	DIG is the AvK alternator range of Cummins Generator Technologies. Used DIG 110, DIG 120 and DIG 130 machines are listed by resellers with their own photographs and condition notes. The letter and figure that follow the frame number belong to the type, so the request carries the whole plate line and the serial number.
COSIMAT N+	AvK voltage regulator	STAMFORD \| AvK	Control, governors and switchgear	A regulator the maker lists for AvK alternators and that alternator-parts traders still sell. It is priced from the type on the unit fitted and the alternator serial number. Where the maker names a follow-up type, that type and any wiring change are written into the quote.
Newage · Newage Stamford	Plate names	STAMFORD \| AvK	Control, governors and switchgear	Older STAMFORD alternators and regulators carry the Newage or Newage Stamford name, from before the business became Cummins Generator Technologies. Such a plate gives the same three facts as a STAMFORD one, type, serial number and frame, while the regulator type is read from its own label.
FE · FE-K	Brushless AC generator	Taiyo Electric	Control, governors and switchgear	FE and FE-K are the families covered by Taiyo's instruction manual for its brushless AC generators, and the alternators in ship-spares listings carry type codes that begin with FE. The full code goes on after those letters with figures and further letters. Copy all of it with the serial number, because the parts list is drawn up for the machine, not for the family.
Exciter and rotating rectifier	Excitation	Taiyo Electric	Control, governors and switchgear	Taiyo describes its marine generators as brushless: the exciter output is rectified on the rotor and fed to the main field, so there are no slip-ring brushes on the excitation path. The diodes and the other parts of that circuit are each ordered by the type printed on the part itself, not by the generator family.
EXU-61A · AS-71-2 · ASC-62-4	Voltage regulators	Taiyo Electric	Control, governors and switchgear	Three regulator types that appear in ship-spares listings under the Taiyo name. Each is a designation of its own, so one is not ordered in place of another. The one to quote is the type printed on the AVR already fitted, read together with the alternator type and serial number.
Thyristor shaft generating system	Shaft generating systems	Taiyo Electric	Control, governors and switchgear	Taiyo lists thyristor-type shaft generating systems among its marine products. The generator on the shaft line runs at whatever speed the propeller turns, and thyristor converters give the ship's network a constant frequency. A request for such a system has two halves, the rotating machine and the converter cabinet, each with its own plate.
Overhang permanent magnet shaft generating system	Shaft generating systems	Taiyo Electric	Control, governors and switchgear	Developed jointly by Taiyo Electric and Mitsui E&S and announced in February 2026. It sits on the fore end of the main engine, where Taiyo's conventional shaft generators sit on the intermediate shaft, and its generator has a permanent magnet rotor in place of a wound one, so the exciter and rotating rectifier items on the other cards do not apply to it.
Main switchboard · emergency switchboard · starter panels	Switchboards	Taiyo Electric	Control, governors and switchgear	Taiyo builds main switchboards, emergency switchboards and starter panels for ships. Panel parts are read from the switchboard drawing, and each breaker, relay and meter inside is quoted from its own label, whichever maker's name it carries.
EVR · EV22x / EV25x / EV31x	Solenoid valves	Danfoss	Valves	EVR is Danfoss's general refrigerant solenoid range; EV22x, EV25x and EV31x are marine-specific types in provision plant and AC pipework. The coil is ordered separately by voltage and is a frequent cause of a fault reported against the valve body.
QT50 · QT70	QT series, small	Eltorque	Valves	The smallest actuators of the range, for small valves. Control boards, covers and seals are quoted against the QT size and the options on the label.
QT250 · QT400	QT series	Eltorque	Valves	The middle sizes of the range. Failsafe and Dual CAN are options shown on the label, so the option line from the label goes into the enquiry together with the valve the actuator turns.
QT800 · QT1000	QT series, large	Eltorque	Valves	The larger quarter-turn actuators for bigger ballast and cargo valves. Ex and open deck versions exist for most sizes, and the version is named on every line.
OS	Oil-fired · vertical	Aalborg	Boilers	A vertical oil-fired auxiliary boiler, first sold as MISSION OS. Its convection section is made of pin-tube elements: an outer tube around an inner tube whose welded pins extend the heating surface. A tube line on an OS is therefore an element, identified from the boiler's own drawing, not a length of plain tube.
OC · OC-TCi	Composite · oil and exhaust gas	Aalborg	Boilers	A vertical boiler fired by oil and heated by exhaust gas in one unit: bare smoke tubes on the exhaust gas side, an oil-fired furnace with its own convection surface on the other. The maker lists the OC and the OC-TCi as separate boilers, so a parts list for one is not read across to the other, and every line should say which section it belongs to.
D	D-type · two drums	Aalborg	Boilers	A large water-tube boiler of D-type design, with a steam drum and a water drum joined by a generating tube bank. For oil firing it carries the steam-atomising KBSD burner, so its burner lines belong with the large top-fired boilers rather than with the small vertical units.
XW	Exhaust gas economiser · water tube	Aalborg	Boilers	A water-tube economiser for engine exhaust, built from finned (gilled) double tubes and run on forced circulation. It has no steam space of its own: water is pumped to it from an oil-fired boiler or a separate steam drum and returns there as a steam and water mixture. Soot blowers on steam or compressed air keep the tubes clear.
KBSD · KBSA · KBM · KBP	Maker's own burners	Aalborg	Boilers	The KB letters name Aalborg's own burners, and the letters after KB are separate designs, not sizes of one. The KBSD is a steam-atomising burner for large top-fired boilers. KBSA, KBM and KBP appear in the maker's burner list and in independent parts lists, where lances, nozzles, electrode sets and ignition transformers are listed burner by burner and size by size.
MB series	Vertical water tube	Kangrim	Boilers	The MB boilers are vertical cylindrical water tube units, the larger of the auxiliary types. Tubes and tube stubs, refractory, burner head items, safety valves, gauge glass sets, level control parts and manhole and handhole gaskets are the recurring lines.
MH · MD series	Horizontal and two-drum	Kangrim	Boilers	MH names the horizontal auxiliary boilers and MD the two-drum build, and the letter is the identity rather than a size class. Requests cover tubes, refractory, burner and ignition items, safety and feed valves and the gasket sets opened at survey.
MS · PC series	Cylindrical and composite	Kangrim	Boilers	MS is the smaller cylindrical boiler and PC the cylindrical composite build fired and exhaust-heated in one shell. On a composite unit, state which side the request is for, because the fired side and the gas side are different tube and gasket scopes.
EA · EB · EM series	Exhaust gas boilers and economizers	Kangrim	Boilers	The E codes are the exhaust gas boilers and economizers, EA being the smoke tube natural circulation build with a steam space. Tube elements and stacks, soot blower parts, expansion joints and gaskets are the items, and an economizer request is quoted from the element drawing rather than from the engine.
GK series	Marine composite boiler	Miura	Boilers	GK is the composite boiler line, written with a figure group after the letters on the plate. Tubes and tube elements, refractory, burner head and ignition items, safety valves and gasket sets are the recurring lines, and the figure group belongs in the request as written.
HB · VWH series	Marine auxiliary boilers	Miura	Boilers	HB and VWH are the marine auxiliary boiler lines, and they are separate designs rather than executions of one. Water level control parts, gauge glasses, burner items, feed pump wear parts and gaskets are what buyers enquire about on these units.
VWK series	Marine boilers	Miura	Boilers	VWK plates carry a suffix such as VWK-M29, and the suffix is part of the identity. Send it with the request together with the burner make, since the burner on a boiler of this size is frequently a bought-in unit with its own plate.
Mission OL	Top-fired, two-drum boiler	Aalborg	Boilers	Mission OL is a top-fired, two-drum boiler with membrane walls, and a plate may still carry an older name predating the Mission OL designation. Burner atomisers and electrodes, pin-tube and membrane panel work, mountings and gauge glasses are the recurring lines — and the boiler is sometimes doing an absent economiser's job as well.
GP	Gas burners · GP	Oilon	Burners	GP is the type prefix of Oilon gas burners: the maker files the GP-50 H under its gas burners, and a used GP-80 H was offered as a monoblock gas burner with its gas train mounted on the side. The figures and the suffix after GP decide which head, ignition and gas train items belong to the burner, so the plate line is copied in full, together with the serial number.
RP-130H	Oil burners · RP	Oilon	Burners	RP-130H is an Oilon oil burner type that runs through the maker's own parts names, from the nozzle valve to the ignition electrode, and a used RP-130H was offered second-hand as a two-stage burner for diesel oil or heavy oil. Neighbouring RP sizes share some parts and not others, so the type on the plate, not the family, fixes each line.
RS · RL · RLS series	Gas, light oil and dual fuel	Riello	Burners	RS is the gas programme, RL the light oil one and RLS the dual fuel one, and the letters decide the parts before the size does. The burner carries its own type plate separate from the boiler, so send both.
Burner head and control items	Wear and control parts	Riello	Burners	A burner request is usually a group of small items rather than one: nozzles, electrodes, the flame detector, the ignition transformer, the oil pump, the solenoid valve, the fan and the control box. List them against the burner type, and note the fuel actually in use, because that decides the nozzle and the pump.
SKV-A · SKVJ-M · SKVG	Rotary cup burners · earlier types	Saacke	Burners	The maker's marine data sheets describe the SKV-A as a duoblock rotary cup burner for all kinds of marine boilers and the SKVJ-M as a monoblock rotary cup burner for smaller marine boilers, and its marine burner list also carried the SKVG. Some of its boiler tables write the type with a bracketed G, as in SKV-A (G), so copy the letters exactly as the plate shows them.
SKVJG-M · ROTONOX	Rotary atomiser burners · current	Saacke	Burners	The SKVJG-M is the maker's current marine burner: a compact monoblock rotary atomiser, built as a liquid-fuel or combination burner and offered for gas, methanol and biofuels as well as heavy fuel, MDO and MGO. Saacke presents ROTONOX as the successor to its SKVG and SKVJG burners, and names both series in its work on methanol as a marine fuel.
DDZ-M	Steam pressure atomiser	Saacke	Burners	For higher capacity requirements Saacke uses its DDZ pressure atomising technology instead of a rotary cup. Its data sheet places the DDZ-M steam atomising burner on medium and large water-tube boilers, such as auxiliary and main boilers on tankers and FPSOs. The atomiser parts come from a different list than those of the rotary cup types, which is why the designation goes first in the request.
FMB-VS · FMB-VM · FMB-VM-VL · FMB-VD · FMB-HF	Fired marine boilers	Saacke	Burners	Saacke's own fired boilers: vertical side-fired (FMB-VS), vertical water-tube (FMB-VM), water-tube for medium to large outputs (FMB-VM-VL), top-fired D-type (FMB-VD) and horizontal three-pass (FMB-HF), whose rear chamber opens through large maintenance hatches. The suffix after FMB names the build and belongs in the request. Older maker tables also list an FMW fired marine boiler.
CMB-VS · CMB-HF · CMB-VF-LONOX	Combination boilers	Saacke	Burners	Combination marine boilers that join exhaust gas and oil firing in one unit. On the CMB-VS the propulsion engine's flue gas does most of the work and the oil-fired side covers additional steam demand. CMB-VS and CMB-VF-LONOX are vertical; the CMB-HF is horizontal, with hatches in the rear wall chamber giving access to the flue gas tubes and the furnace.
EMB/EME-HST · EMB/EME-VST · EMB/EME-VFT	Exhaust gas boilers and economisers	Saacke	Burners	Exhaust gas boilers or economisers that also work as silencers in the exhaust line. HST is horizontal and VST vertical, both smoke-tube designs; the VFT is a vertical forced-circulation economiser built from modules that come out without removing the casing, with fixed connections for water jets and soot blowers. A VFT request should name the module as well as the unit.
GCU evo · GCU compact	Gas combustion units	Saacke	Burners	On an LNG carrier the Saacke plate may belong to a gas combustion unit rather than a boiler. The GCU burns surplus boil-off gas in an air-cooled steel combustion chamber that fits in the funnel area and works with several blowers. The GCU compact has an oil-fired pilot burner, and its combustion chamber and burner can be removed through the chimney shaft.
SDR	SDR rotary cup burners	Sunflame	Burners	SDR is the type code of the Sunflame rotary cup burners for marine boilers, and it is the code under which boiler documentation names a Sunflame burner. Copy the full designation as stamped, with every figure and letter after SDR, because the letters alone do not open the right parts list. The burner carries a plate of its own, separate from the boiler, so cup, drive and fuel train items are quoted against the burner plate, the serial and the burner manual.
OSV-600SAI	OSV incinerators · SAI	Sunflame	Burners	OSV is the type code of the Sunflame shipboard incinerators. The letters after the figure group belong to the type: an SAI unit and an SDAI unit of the same figure group are listed as separate types by the maker and by independent parts listings alike. Burner, combustion chamber, fan and control items are read against the plate exactly as it is stamped.
OSV-600SDAI	OSV incinerators · SDAI	Sunflame	Burners	The SDAI version stands next to the SAI version of the same size. Because the two are different types, door, refractory and burner items are never moved from one parts list to the other on the strength of the figures. The serial settles which build is installed, and other OSV sizes are read from their own plate in the same way.
Rotary cup · flame eye · flame eye relay	Wear and control parts	Sunflame	Burners	The rotary cup belongs to the burner, while flame eye and flame eye relay lines come up on Sunflame burner and incinerator requests alike. Each is read from its own marking and item number rather than from the unit's figure group. The relay and the control unit go the OEM route for the type in the parts list, so send the label of the removed relay with the unit plate.
SFFG II	Dual-fuel burners · larger boilers	Volcano	Burners	In Mitsubishi's dual-firing auxiliary boiler, SFFG II is the Volcano dual-fuel burner listed for the larger boiler sizes, and it can fire oil alone, gas alone or both together. Mitsubishi writes the type as SFFGII, and it is also seen with a space as SFFG II. Copy it the way the burner plate reads, with the serial number, because the oil side, the gas side and the flame monitoring items are all listed against that particular burner build.
Vignis	Dual-fuel burners · smaller boilers	Volcano	Burners	Vignis is the Volcano dual-fuel burner that Mitsubishi lists for the smaller sizes of the same boiler, with a Sunflame SDR burner as the other choice there. It is a type of its own, not a smaller SFFG II, so an item is never carried from one parts list to the other just because both burners fire the same fuels. Where the boiler documents name both Vignis and SDR, the plate on the burner front shows which one was fitted.
Bowl bottom, bowl hood and lock ring	02	GEA Westfalia	Separators	Erosion at the solids ports and fretting on the lock ring thread are the usual findings on high-hours heavy fuel machines. These are heavy rotating parts machined as a balanced group — the stamped marking on the hood and the machine number must both appear on the RFQ.
Clarifier configuration	Bowl configuration	GEA Westfalia	Separators	Clarifier configuration closes off the heavy-phase outlet with a clarifier disc or sealing ring in place of the regulating ring, and uses a different top disc. OSD and OSE bowls are rigged both ways, so state whether the machine is currently running as clarifier or purifier — the bowl parts differ between the two.
Disc stack and bowl discs	01	GEA Westfalia	Separators	The stack is a matched set. Disc count, caulk height and total stack height determine how the lock ring seats and how much compression the stack carries. Mixing new discs into a worn stack gives uneven caulk spacing and an altered stack height, disturbing flow distribution between the discs and the compression the lock ring applies. A stack worn throughout instead loses height and leaves the bowl short of correct clamping. Record the number of discs removed and the measured stack height before ordering.
Discharge system	Solids handling	GEA Westfalia	Separators	Sliding piston, closing chamber, nozzles and the operating water valve block. This subassembly is where most partial-discharge and bowl-not-closing complaints originate.
eagleclass	Separator class	GEA Westfalia	Separators	A GEA marine separator class designation that appears on the plate alongside the type code — read as a marine separator eagleclass, type OSE 20, for instance. Quote it together with the type designation rather than in place of it, and note the hardware and software revision recorded in the machine file where a control input is involved.
Gear parts and coupling elements	06	GEA Westfalia	Separators	Worm wheel and worm shaft wear shows as noise, metal in the gear oil and a slow rise to bowl speed. Friction coupling pads glaze and slip. Gear oil condition and the recorded run-up time are useful evidence to include when these parts are requested.
Operating water valve and seal rings	04	GEA Westfalia	Separators	Bowl opening and closing depend on clean operating water at the right pressure reaching the closing chamber. A scaled valve seat or a perished sliding piston sealing ring leaves a bowl that will not close after discharge. An eroded or enlarged nozzle bleeds closing water away faster than it is replaced, giving continuous leakage at the solids ports or discharges that fire without command; a blocked nozzle traps closing water and leaves a bowl that will not open at all.
OSA / OSB / OSC bowls	Legacy self-cleaning	GEA Westfalia	Separators	Earlier self-cleaning bowl generations still in service on smaller auxiliaries. Bowl discs, lock rings and spindle parts for these often need identification from the stamped bowl marking rather than a catalogue reference.
OSD series	Self-cleaning purifier	GEA Westfalia	Separators	The workhorse marine purifier line — sizes such as OSD 6, OSD 18 and OSD 35 handle heavy fuel and lube oil duty with a hydraulically actuated sliding piston and a full bowl-periphery solids ejection.
OSE series	Self-cleaning purifier	GEA Westfalia	Separators	Separators covering the sizes OSE 5, OSE 10, OSE 20 and OSE 40, with bowl internals and the operating water block differing from the OSD equivalents even where the throughput rating looks similar.
Regulating ring (gravity disc)	03	GEA Westfalia	Separators	On conventional purifiers without unitrol interface control, the regulating ring bore sets the position of the oil–water interface in the bowl. Too large a bore moves the interface outward toward the bowl periphery, breaking the water seal and losing oil to the water side; too small a bore moves it inward, letting water carry over into the clean oil. Denser fuel points toward a smaller bore. Separating temperature and throughput move the interface as well, and which way they move it is read from the maker's chart for that bowl rather than from a rule of thumb. The correct figure follows from fuel density at 15 °C, separating temperature and actual throughput, not from what was fitted last time.
Spindle, top and bottom bearings	05	GEA Westfalia	Separators	Rising vibration and a changed run-up time are the early signs. The top bearing sits in its damping assembly with springs or elastic elements that must be renewed together with the bearing; the bottom bearing is matched to the spindle seat. Bearing renewal without checking bowl balance rarely cures the vibration on its own.
unitrol / unitrolplus	Interface control	GEA Westfalia	Separators	These systems replace the regulating ring altogether, holding the oil–water interface in position electronically from a water-content transducer signal, and they also handle discharge timing, water feed and alarms. Sensors, solenoid pilot valves and the transducer itself are the parts most often requested from this side of the machine.
Worm gear drive	Drive assembly	GEA Westfalia	Separators	Horizontal shaft, worm and worm wheel, friction coupling pads and the vertical spindle. Ratio and worm wheel tooth count vary with bowl speed, so drive parts are machine-specific rather than family-wide.
NT series frames	NT · gasketed plate	Kelvion	Heat exchangers	The NT gasketed plate frames are found on jacket cooling and central cooling duty, written as NT50, NT80, NT100, NT150 and similar. Plates, gasket sets, tightening bolts and the pressure plate items are the scope, and the plate material belongs in the request with the frame.
NX series frames	NX · gasketed plate	Kelvion	Heat exchangers	NX was developed from the NT plate technology for duties calling for small temperature differences and higher pressure. Plate and gasket parts follow the frame and the pressing, so a request written from the NT code will not reach an NX pack even where the frames look alike.
VT · Varitherm	VT · gasketed plate	Kelvion	Heat exchangers	The VT plates and gaskets are asked for by the Varitherm name as often as by the letter code, and both find the same unit. Send the frame designation and the plate count together; on a cooler this old the gasket compound is worth stating as well.
Bloksma box coolers · K-type · PF plate fin	Bloksma · machine cooling	Kelvion	Heat exchangers	The Bloksma line covers box coolers in the sea chest, plate fin oil coolers and shell-and-tube coolers for engines, gearboxes and charge air. Tube stacks and bundles, anodes, covers and gaskets are the items, and a box cooler is quoted from the type and the chest arrangement rather than from the engine.
GEA plate, Kelvion paperwork	Maker identity	Kelvion	Heat exchangers	The heat exchanger business left the GEA group and trades as Kelvion, with the machine cooling line renamed from GEA Bloksma, while the plates in service still carry the older name. Both names reach the same unit, so send the plate as it reads and the type code with it.
OMD-24	OMD-24 · 15 ppm bilge alarm	Deckma	Oily water separators	Two separate items: a computer unit that shows the reading and gives the alarm, and a measuring cell fed with water from the separator outlet. Each has its own label and serial, and the cell can be ordered on its own. As MEPC.107(49) requires, the alarm also records the operating status of the separator, so a gap in the log can sit on the separator side.
OMD-2008	OMD-2008 · 15 ppm bilge alarm	Deckma	Oily water separators	A computer unit with a measuring cell, like the OMD-24. Letters after the number on the label are part of the type and are copied with it, together with the serial of the computer unit and the number of the cell. The label, not the age of the ship, decides what is fitted.
OMD-2005	OMD-2005 · 15 ppm bilge alarm	Deckma	Oily water separators	A Deckma type with three items on the request side: a computer unit with a memory card for the data log, a measuring cell and a valve assembly. Each is identified from its own label before a line is opened.
Measuring cell and calibration certificate	Calibration and approval	Deckma	Oily water separators	MEPC.107(49) leaves the accuracy check of a 15 ppm bilge alarm to the manufacturer or persons the manufacturer has empowered, and the certificate with the date of the last check stays on board. The same paragraph allows the alarm to be replaced by a calibrated one. Either way the request starts from the cell label and the certificate date.
OWSAN-0.5 · OWSAN-1 · OWSAN-2.5 · OWSAN-5 · OWSAN-7.5 · OWSAN-10	OWSAN · two-stage separator	Detegasa	Oily water separators	The two-stage bilge separator in Detegasa's current brochure: a coalescent filter in the first stage separates free oil by gravity, and an adsorption filter in the second stage breaks emulsions, with a suction-type pump feeding the unit. Adsorption cartridges, the coalescent filter element, suction pump wear parts and monitor items are the recurring lines; the figure after OWSAN is the size and belongs in the request.
OWSAN-P	OWSAN · integrated monitor	Detegasa	Oily water separators	The newer OWSAN model, whose control panel integrates the oil monitor and the operator interface. On a -P unit the monitor items are quoted against the panel rather than as a separate bilge alarm, alongside the same cartridge and filter lines as the OWSAN.
DELTA OWSA	DELTA · two-stage, adsorption	Detegasa	Oily water separators	A DELTA-type two-stage design built to IMO MEPC.107(49): a gravity static separator followed by an adsorption stage. Adsorption cartridges, pneumatic valve items for oil discharge, overboard, recirculation and adsorption bypass, the flushing solenoid valve and the 15 ppm bilge alarm monitor parts are the recurring lines.
DELTA OWS	DELTA · single separator	Detegasa	Oily water separators	The older separator built to IMO MEPC.60(33), with a tank and internals, a pump, pneumatic valves and electrode-controlled oil discharge. The oil content monitor was an option on this build, so confirm whether one is fitted before monitor parts are listed.
STPN · DELTA STPN	STPN · biological sewage plant	Detegasa	Oily water separators	Aerobic biological sewage plant for black and grey water, offered in modular or containerised versions and suited to vacuum or gravity collection. Air blower items, the effluent discharge pump, dosing equipment where chemical disinfection is fitted, and level and control items are the usual lines; send the plant figure from the plate as written.
PRBN · DELTA PRBN	PRBN · biological sewage plant	Detegasa	Oily water separators	Biological plant for black water only, built for a reduced footprint. Blower and discharge pump items are the recurring lines, with dosing items where fitted; state PRBN rather than STPN, since the two treat different waste streams.
MBR	MBR · membrane bioreactor	Detegasa	Oily water separators	Membrane bioreactor plant for large crews: collecting, aerobic and membrane tanks, with submerged membranes that Detegasa names as Mitsubishi Rayon and automatic backflushing, and no chemicals needed for disinfection. Membrane modules, the recirculation pump and aeration items are the recurring lines.
IRA	IRA · solid waste only	Detegasa	Oily water separators	Marine incinerator designed to burn solid waste only. Diesel-oil burner items, exhaust gas fan and damper items, exhaust-gas thermocouples, refractory blocks and door and sluice seals are the recurring lines; the size follows the letters, as in IRA-10.
IRLA	IRLA · solids and sludge	Detegasa	Oily water separators	Incinerator designed to burn solid waste and sludge, simultaneously where required. Next to the burner, fan, damper and refractory items it may carry Detegasa's optional sludge tank, whose heating, sludge circulation pump, level switches and safety valves form their own group of lines. Sizes are written as in IRLA-50.
DELTA IR-10	DELTA · solid-waste incinerator	Detegasa	Oily water separators	A DELTA solid-waste incinerator type from an older Detegasa specification: incinerator, diesel-oil burner and control panel on a baseplate, with the exhaust gas fan, regulating damper and exhaust-gas thermocouple supplied loose. The specification lists those loose items separately, so name them as separate lines.
OILCHIEF	DVZ-FSU OILCHIEF	DVZ	Oily water separators	The OILCHIEF plants are bilge water treatment units rather than centrifuges, and the items that are renewed are the coalescer and filter inserts, the oil content monitor parts, level probes and solenoid valves. Quote the unit type and serial, and send the type approval certificate held aboard with the request.
Oilmaster · DVZ 1000 VC	Oilmaster	DVZ	Oily water separators	The Oilmaster designation appears with a figure and a letter group after it, and the letters carry the execution. Inserts, monitor cell and lamp items, gaskets and the automatic valve set are the recurring lines; the insert and the monitor are what an inspection looks at first.
3SEP	3SEP · two-stage	JOWA	Oily water separators	The 3SEP is a two-stage bilge water separator working on differential specific gravity, coalescence plates and filtration, and it was offered in several sizes under one designation. State the size from the unit plate, because the insert and plate pack follow it rather than the family name.
Coalescer plates and filter inserts	Service items	JOWA	Oily water separators	On a two-stage plant the consumables are the coalescing plate pack and the second-stage filter insert, and they are renewed on different intervals. List them as separate lines, alongside the monitor parts and the solenoid valves, and note which discharge standard the plant is set for, since the insert differs between standards.
Seaguard	Bilge alarm / oil content monitor	JOWA	Oily water separators	Seaguard is JOWA's bilge alarm and oil content monitor, sold both as part of a 3SEP installation and as a standalone retrofit. The measuring cell, sample line, seals and the alarm or display unit are the parts that wear; state whether the monitor is factory-fitted or retrofitted, since the mounting kit differs between them.
SMART BILGE	SMART BILGE · 15 ppm bilge alarm	Rivertrace	Oily water separators	The Rivertrace bilge alarm type built for MEPC.107(49). Copy the type exactly as the rating label prints it, with any sign or letter after the name, and add the serial and the supply voltage. Any part for it, from the cell to a board, is matched to all three, not to the name alone.
SMART CELL	SMART CELL · cell or whole monitor	Rivertrace	Oily water separators	The name is met in two places. Rivertrace material uses it for the measuring cell of the SMART BILGE, while trader listings use Smart Cell or Smart Cell Bilge for a whole monitor. Say which item carries the name on your ship, the cell or the monitor housing, and photograph that label; the two lead to different lines.
OCD CM	OCD CM · earlier bilge monitor	Rivertrace	Oily water separators	An earlier Rivertrace monitor, built to MEPC.60(33), the resolution that MEPC.107(49) later superseded. OCD CM units are still met behind separators. A part for an OCD CM is never assumed to fit a SMART BILGE, or the other way round; each type is quoted from its own label.
Calibration certificate	Calibration and approval	Rivertrace	Oily water separators	Under paragraph 4.2.11 of MEPC.107(49), as rewritten by MEPC.285(70), the alarm is calibrated and tested only by the manufacturer or persons it has empowered, no more than five years apart, counted from commissioning, or sooner where the manufacturer's instructions set a shorter term. The certificate stays on board, and a calibrated alarm may be fitted instead. Paragraph 4.2.10 seals the alarm: opening it for anything past the simple drift, repeatability and zero checks means breaking a seal.
SKIT/S-DEB · SKIT/S-DEB-SPS	SKIT · suction type	RWO	Oily water separators	The SKIT/S-DEB is the suction-type separator combining a coalescer with an emulsion-breaking absorber, and the type is out of production while units remain in service. The absorber and coalescer inserts, gaskets, level probes and the automatic discharge valve are the recurring lines, and the slash in the designation belongs in the request as written.
OWS-COM	Oil content monitors	RWO	Oily water separators	The monitor is a separate item from the separator and fails separately, so it is worth naming on its own line. Measuring cell, lamp or light source, seals and the sample line items are what is renewed, and the certificate reference identifies which monitor build the plant was approved with.
CBM+	Continuous bilge monitor	RWO	Oily water separators	CBM+ is RWO's newer continuous bilge monitor, logging discharge data against GPS position rather than only reading oil content at the point of discharge. It sits alongside OWS-COM rather than replacing it on every installation, so confirm which monitor is actually fitted before quoting. Measuring cell, sample-line fittings, seals and the display or logger unit are the recurring lines.
Bilge separator	Coalescer type	Sasakura	Oily water separators	The bilge separator is built around coalescers and is a compact unit rather than a centrifuge. Coalescer and filter inserts, gaskets, the monitor parts and the automatic valve set are the items; no internal series numbering was confirmed for this line, so send the figures from the plate as written rather than matched to a scheme.
PURELIO	Two-stage separator, current line	Sasakura	Oily water separators	PURELIO is Sasakura's current oily water separator, a two-stage unit with a second-stage coalescer designed to come out for servicing without pulling the plant off the vessel. Coalescer cartridges, filter inserts, gaskets and the monitor's measuring cell are the recurring lines. Confirm which generation is fitted — an older installation may still carry the generic bilge-separator nameplate rather than the PURELIO name.
X · WX · Aquario	Freshwater generators	Sasakura	Freshwater generators	The Sasakura plate is met on freshwater generators, where X and WX are the flash evaporator series and Aquario is the plate-type unit. Tube or plate packs, gaskets, ejector parts and the pump wear set are the items, and the series letter decides which of those the request is about.
Air-cooled builds	Cooling arrangement	Hatlapa	Air compressors	Finned cooler sections and fan-side components replace the water-side hardware. Cooler section, fan wheel and guard part references do not carry over from a water-cooled machine of the same type number.
Coupling and drive side	Drive arrangement	Hatlapa	Air compressors	Flexible coupling elements, drive bushes and mounting hardware differ between direct-coupled and belt-driven installations. A photograph of the drive end usually settles which arrangement is fitted.
Legacy W-frames	Older and superseded frames	Hatlapa	Air compressors	Older W-series machines still in service may reference part numbers that have been superseded. Serial number and a nameplate photograph are needed before any current reference is treated as equivalent. The type may be stamped with or without a space — W 110 and W110 are the same machine — and later units may be nameplated under the MacGregor group. Larger and smaller W-frames outside the four shown here are handled on the same evidence.
Controllable Pitch Propeller	Controllable pitch propellers	Berg Propulsion	Deck equipment	Berg's main-shaft propeller, the blades turned in the hub by hydraulic pitch control, for diesel-mechanical and diesel-electric plants. The hub circulates its oil with integrated moisture monitoring, and that one oil both lubricates the hub internals and carries the pressure that moves the blades. Blade seal kits, hub components and pitch hydraulic items are the recurring lines.
BCP hubs · feathering	Controllable pitch propellers	Berg Propulsion	Deck equipment	BCP, for Berg Controllable Pitch Propeller, is the hub name under which Berg launched a feathering design that works inside its standard hydraulic hub, with pitch running from full astern through full ahead to feathered, and later offered the option across its BCP hubs. On twin-screw ships one propeller can be feathered while the vessel runs on the other shaft. Say in the enquiry whether the propeller documents mention BCP or feathering.
Fixed Pitch Propeller	Fixed pitch propellers	Berg Propulsion	Deck equipment	Berg also builds fixed pitch propellers for steady-load operation. With no pitch mechanism in the hub, the hub-oil and pitch-hydraulic items do not apply, and the recurring lines move to the shaft line: stern tube bearings, the stern seal and their gaskets.
MTA series	Azimuth thrusters	Berg Propulsion	Deck equipment	Berg's steerable thruster, with a controllable or fixed pitch propeller, often in an integrated nozzle. The Z-drive takes a horizontal input shaft from an engine or a motor; the L-drive takes a vertical input shaft from an electric motor. Berg names tugs, ferries and offshore vessels as its usual applications; gear sets, bearings, shaft seals and steering seals as the recurring lines.
MTT	Tunnel thrusters	Berg Propulsion	Deck equipment	Bow and stern transverse thrusters with fixed or controllable pitch, driven by an electric motor, a diesel engine or a hydraulic motor, and built in modular form so that key components can be exchanged as units. Propeller-shaft seals, gear and bearing parts and, on controllable pitch units, hub seals recur.
MPC800	Propulsion control	Berg Propulsion	Deck equipment	Berg's marine control system for its propellers and thrusters, on a redundant dual-processor architecture with interfaces to joystick, autopilot, DP and VDR. Where the panel on board does not show MPC800, a photograph of it settles more than a guess at its name. Control modules, panels and levers are the lines it brings.
FU	Tunnel thrusters	Brunvoll	Deck equipment	CP or FP tunnel units in L- or Z-drive: propeller shaft seals, blade seals, replaceable blade bearing liners, pitch mechanism and hydraulic parts.
FW … R · LowNoise FU	Resiliently mounted tunnel thrusters	Brunvoll	Deck equipment	Resiliently well-mounted units and LowNoise double-tunnel units; the LowNoise type shares the FU letters, so state the double tunnel.
RDT	Rim driven tunnel thrusters	Brunvoll	Deck equipment	Permanent magnet rim drive with no gearbox, shaftless or with a central shaft: motor and drive items.
AR	Retractable azimuth and Combi thrusters	Brunvoll	Deck equipment	Lifting actuator seals, locking devices, azimuth brakes, stem sealing box and bearing housing; say whether the unit is the Combi.
AUP/AWP · PU	Propulsion azimuth thrusters	Brunvoll	Deck equipment	Push-ducted and pull-open units, weld-in or bolt-in: shaft and blade seals, blade bearing liners, pitch and steering items.
BruCon · Saia PCD	Thruster control	Brunvoll	Deck equipment	Controller modules, bridge levers, indicators and pitch feedback units; give the PLC type from the open cabinet.
Power packs and control gear	Hydraulic systems	Hatlapa	Deck equipment	Pump unit plate, working pressure and circuit drawing reference are the starting point. Seal kits, filter elements, relief and directional valve parts are the usual scope on these requests.
Rotary vane steering gear	Steering gear	Hatlapa	Deck equipment	Rotor and stator size designation, rated torque and system pressure identify the unit. Requests usually concern vane seals, bearing bushes, hydraulic pump parts and control valve components.
W110	W-series · smaller frame	Hatlapa	Air compressors	Smaller-frame starting-air unit, often installed as the topping-up or second compressor. Requests typically cover concentric valve assemblies, piston ring sets, oil scraper rings and crankcase seal kits.
W140	W-series · mid frame	Hatlapa	Air compressors	Mid-frame unit found on general cargo, coaster and workboat installations. Cylinder and piston sets, big-end bearings, safety valves and cooler elements are the common items.
W220	W-series · larger frame	Hatlapa	Air compressors	Larger free air delivery for main-engine starting duty on bigger installations. Valve seats and plate stacks, HP piston assemblies, intercooler tube stacks and unloading valve components.
W330	W-series · larger frame	Hatlapa	Air compressors	Larger frame within the range shown here; the W-series continues above this size. Main bearings, big-end bearings, connecting rod bolts, cylinders, aftercooler elements and separator internals are typical overhaul-scope requests.
Water-cooled builds	Cooling arrangement	Hatlapa	Air compressors	Intercooler and aftercooler tube stacks, cooler covers, jacket seals, water-side gaskets, and zinc anodes on seawater-cooled builds. State the cooling arrangement on the request — it changes a large share of the parts list.
Windlasses and mooring winches	Deck machinery	Hatlapa	Deck equipment	Type plate, drive arrangement, hydraulic or electric configuration and brake band details are needed. Common items are seal kits, brake linings, gearbox bearings, clutch parts and hydraulic motor components.
CPC-AF · CPR-AV · CPR-AH · CPC-AR	CPP · A-type Series	Kamome	Deck equipment	Kamome's controllable pitch propeller for small and medium-sized ships. The hub is split into fore and aft sections and the blades sit between them, a layout the maker describes as easy to overhaul and reassemble. CPR-AV and CPR-AH carry a built-in reduction gear on a different axis, CPC-AR on the same axis.
CPC-BF · CPR-BV · CPR-BH · CPC-BR	CPP · B-type Series	Kamome	Deck equipment	The series for medium and large-sized ships, built on a solid hub with each blade assembled individually. Kamome's customer service states that on a CPP it can replace a single blade, so a damaged blade is an enquiry in its own right rather than a reason to price a whole propeller. Reduction-gear builds follow the A-type pattern: CPR-BV and CPR-BH on a different axis, CPC-BR on the same axis.
TCB-35 — TCB-270	Side thruster · controllable pitch	Kamome	Deck equipment	A tunnel thruster with a controllable pitch propeller, released in 2004: thrust direction is changed by pitch alone, with no reversing mechanism, and the drive can be an engine, an electric motor or a hydraulic motor. The catalogue section names the parts a buyer meets: blade, propeller hub, piston, guide block, oil distribution, cylinder, compact seal, spherical roller thrust bearing, gear case, propeller shaft and driving shaft.
TFA-06 — TFA-110	Side thruster · fixed pitch	Kamome	Deck equipment	A fixed pitch thruster of simple construction; Kamome states that only the seal in the rotating part needs regular replacement. Drive by engine, electric motor or hydraulic motor. With no pitch mechanism, enquiries centre on that seal, the gear set, the bearings and the drive.
LT series	LT · two-stage piston	Atlas Copco	Air compressors	LT is the two-stage oil-lubricated piston range, the one reached for on starting air duty, with LE naming the lower-pressure counterpart in the same programme. Concentric valve assemblies, piston ring sets, gasket and seal kits and cooler elements are the recurring lines; the frame size in the type code is what the parts follow.
LT KE	LT · water-cooled cast iron	Atlas Copco	Air compressors	The KE execution is the water-cooled cast iron build for marine starting air systems, and it is a different machine from the air-cooled aluminium one under the same LT letters. State which is fitted before valves, rings or cooler parts are quoted.
Valve, ring and gasket sets	Overhaul items	Atlas Copco	Air compressors	On a starting air compressor the parts that decide whether the main engine turns are the valve assemblies, the rings and the gaskets, and they are ordered as sets against the compressor serial. Add the safety valve, the unloader and the oil level items to the same list, since a stripped machine is open only once.
BM 5.1/30-7.5-V · BM 6.1/30-11-V · BM 10.1/30-15-V	Bauer BM series · two-stage	Bauer	Air compressors	Bauer's air-cooled, direct-coupled starting-air compressors for shipping, built with two stages in the lower pressure class. Every stage has its own safety valve, an integrated oil pump lubricates the main components, and intermediate separators with automatic condensate drainage are standard. Requests usually cover the valves for each stage, ring sets, drain valves and the elastic coupling element.
BM 20.1/40-30 · BM 30.1/40-45 · BM 60.1/40-90 · BM 70.1/40-110	Bauer BM series · three-stage	Bauer	Air compressors	The larger three-stage BM frames, which Bauer presents for ship installations, use on board and offshore duty. Classification approval by DNV, ABS or RINA is listed as an option, so a unit delivered with a class certificate is quoted with that certificate in view. A third stage means a third set of valves, rings and a third safety valve on the list.
I 15.1-7.5-V · I 15.11-11-V · I 18.1-15-V	Bauer VERTICUS series	Bauer	Air compressors	Air-cooled high-pressure units for air and nitrogen in a vertical layout, with a self-tensioning V-belt drive and the B-DRAIN automatic drain on the intermediate and final separators. Bauer's tables list some of these designations, such as I 15.11-11-V, in two pressure classes, so the final pressure from the plate has to travel with the designation.
I 100-3-MV · I 120-5.5-MV · I 12.14-7.5-MV	Bauer MINI-VERTICUS series	Bauer	Air compressors	Compact vertical high-pressure units for air and nitrogen. Bauer offers an integrable P 61 or P 81 purification system on them, so the cartridge type and the filter housing belong in the same request as the valves, piston rings and V-belt.
PE 100-3-VE · PE 120-5.5-VE · PE 180-15-VE	Bauer PE-VE series	Bauer	Air compressors	Bauer's compact high-pressure package for air and nitrogen where space is tight, delivered with B-CONTROL MICRO control and B-DRAIN as standard. The -VE-420 builds are separate designations in Bauer's tables, so copy the ending in full rather than shortening it to the family name.
IB 23.0-30 · I 26.0-55 · I 52.0-110 · B 26.4-55	Bauer I and IB series · water-cooled	Bauer	Air compressors	Water-cooled high-pressure units for air and nitrogen, plus the B 26 medium-pressure counterpart. Bauer describes targeted water cooling of the block, the valve heads, the intercoolers and the aftercoolers on these series, built on its BK 23 to BK 52 blocks, and says its block design makes cylinder water jackets unnecessary. A plate heat exchanger set is offered to keep seawater out of the compressor circuit.
2L · 3L · L3 · L4 · L2-20 · L2-35	L · starting air piston	Deno	Air compressors	The L codes are the multi-stage direct-driven starting air piston machines, written both as 2L and 3L in front of the size and as L2 and L3 with the size after it. Valve assemblies, piston and ring sets, crankshaft and connecting rod bearings, gasket sets and cooler elements are the usual scope.
DSA · DSD	Screw compressors	Deno	Air compressors	DSA is the belt-driven and DSD the direct-driven rotary screw programme. A screw machine is enquired about differently from a piston one: the air end, the oil separator element, the filters, the thermostatic valve and the coupling are the items, and the drive execution is part of the identity.
DPA	Service air piston	Deno	Air compressors	The DPA machines are the air-cooled belt-driven piston compressors on service air duty. Belts, valve assemblies, rings, gaskets and the intake filter are the recurring lines, and the service air machine is worth naming separately from the starting air one when both are on the same request.
Four-stroke, medium-speed duty	Scope note	IHI	Turbochargers	The IHI RH-series turbochargers described here serve four-stroke, medium-speed engines on auxiliary gensets, workboats, fishing vessels and tugs. Large, slow-speed two-stroke main engines are a different business, unrelated to the RH-series turbochargers on this page. Diesel United, which licence-builds such engines to WinGD designs, was once part of IHI but has belonged to the Mitsui E&S group since April 2023 as Mitsui E&S DU.
NIIGATA-brand HX and AHX engines	Corporate connection	IHI	Turbochargers	NIIGATA-brand medium-speed diesel engines — the HX and AHX series used on tugs, offshore support vessels and harbour craft — are built by IHI Power Systems Co., Ltd. (formerly Niigata Power Systems, now part of the IHI Group). A turbocharger request against a NIIGATA nameplate is reviewed with that corporate link in mind.
RH series	IHI RH Series	IHI	Turbochargers	The core marine range — RH133, RH143, RH163, RH183, RH203, RH233, RH253 and RH283 — sized across a small, medium and large frame family. Requests typically open with a rotor shaft assembly, nozzle ring or bearing set rather than a single fastener.
RH133 / RH143 / RH163	Frame range	IHI	Turbochargers	The smaller-to-medium RH frames, most often requested against auxiliary genset and workboat duty. State the exact frame number as it appears on the nameplate before a rotor or bearing line is quoted.
RH183 / RH203 / RH233 / RH253 / RH283	Frame range	IHI	Turbochargers	The larger-frame RH machines, typically overhaul-driven: nozzle ring, turbine blade and bearing casing lines quoted together against one docking window.
RHB, RHC and RHE small-frame variants	IHI RH Series — Yanmar duty	IHI	Turbochargers	A separate small-frame line built specifically for Yanmar marine diesel engines: RHB31, RHB52, RHC61 and RHE62, for example RHB31GW fitted to the Yanmar 4JH-HTE and RHE62W fitted to the 6LP-STE. Copy the full type suffix exactly as stamped — this line is not interchangeable with the RH133–RH283 frame family.
RU series	High-pressure-ratio family	IHI	Turbochargers	IHI also lists an RU high-pressure-ratio family (RU110, RU120/122, RU124, RU125). Ratings and dimensions are confirmed against the specific plate before anything is quoted — this page does not carry assumed specifications for the RU line.
Yanmar marine diesel engines	Engine duty	IHI	Turbochargers	Yanmar marine diesel engines are OEM-fitted with IHI RH-series turbochargers across auxiliary and propulsion duty. Provide the Yanmar engine type alongside the turbocharger plate — the same RH frame is built to different specifications for different engine applications.
ACD — high-capacity frames	IMO ACD Series	IMO AB	Pumps	Double-suction construction feeds both rotor ends and discharges in the centre, which doubles displacement for a given rotor size and cancels axial thrust between the two halves rather than raising differential pressure. Typical duties are high-flow, moderate-pressure lube oil and transfer service. High-pressure hydraulic duty is met by single-suction frames with a short rotor lead and more sealed closures in series.
ACE — transfer and booster frames	IMO ACE Series	IMO AB	Pumps	Compact single-suction three-screw pumps on fuel oil transfer, separator feed, burner supply and hydraulic power pack duty, where a short rotor lead and more sealed closures in series carry the high differential pressure. Requests commonly resolve to a matched rotor set, the idler bearing surfaces, the pump insert, or a mechanical seal and bearing kit.
ACG — lube oil service frames	IMO ACG Series	IMO AB	Pumps	Larger single-suction frames on four-stroke and geared plants for engine and gearbox lubricating oil circulation, on stern tube and prelube service across ship types, and on heavy fuel booster and hydraulic power pack duty. On large two-stroke installations the main LO circulating pumps are centrifugal; the screw pumps sit on stern tube, prelube, transfer and purifier feed. Housing liners, cartridge assemblies and relief valve internals are the recurring lines on this family.
Built-in relief and bypass valves	Protection device	IMO AB	Pumps	Spring, cone or piston, seat and adjusting parts of the integral relief valve. It is an over-pressure protection device for a positive displacement pump — not a flow regulator — and its condition is worth stating in the request.
Mechanical seal variants	Sealing arrangement	IMO AB	Pumps	The seal execution is encoded in the designation suffix, not the size figure — two ACG pumps of identical bore can carry different faces and elastomers because one was built for heated HFO at the booster and the other for distillate transfer. Give the suffix characters and the working temperature; where the plate is gone, the medium and the line temperature substitute for them.
Pump inserts and cartridges	Rotating assembly	IMO AB	Pumps	IMO supplies the rotating assembly as a unit on most ACE and ACG frames: matched rotors in their liner, dropped into the casing that is already bolted to the foundation. Ordering at insert level reduces the clearance guesswork of rebuilding a worn body around new rotors, and on a pump whose casing is welded into a fuel line it is often the only route that does not need the pipework broken.
Air-cooled and water-cooled builds	Build variants	J.P. Sauer	Air compressors	Sauer normally carries the cooling arrangement in the type code itself — the suffix on the WP designation distinguishes the air-cooled build from its water-cooled equivalent. Send the full designation including suffix letters, since cooler elements, fan wheels, cooling water connections and temperature switches do not cross between the two builds.
Breathing-air packages	Duty variants	J.P. Sauer	Air compressors	Where the machine feeds SCBA or escape-set charging, final pressure is well above a working-air unit's and the stage count rises accordingly — state the rated pressure from the plate. Filter cartridges, separator elements and moisture-monitoring items carry documentation expectations that plain working-air spares do not.
Hurricane series	Series	J.P. Sauer	Air compressors	High-pressure arrangements used where breathing air or elevated final pressure is required, reaching well beyond a starting-air machine's rated pressure. Purification-stage cartridges, separator elements and high-pressure fittings sit alongside the usual mechanical wear items.
Other WP designations	Type designation	J.P. Sauer	Air compressors	The WP designations span many intermediate sizes and build revisions. A type code on its own rarely settles a part; the series name, the serial and the stage count decide which of several superseded assemblies applies.
Passat series	Series	J.P. Sauer	Air compressors	Starting-air and control-air packages built around the same reciprocating core. Valve plates, springs, unloader components and pressure switches are the recurring consumables.
WP15L	Type designation	J.P. Sauer	Air compressors	Compact low-throughput unit typically found on emergency and topping-up duty. Requests usually concentrate on suction and delivery valve assemblies, first- and second-stage rings, and the small-bore liner.
WP81L	Type designation	J.P. Sauer	Air compressors	Mid-range machine built for starting air and general working air. Piston and guide rings, stage valve sets, intercooler elements and condensate drain components dominate the RFQ traffic on this size.
WP311L	Type designation	J.P. Sauer	Air compressors	Larger WP unit charging main-engine air receivers. Crankshaft and connecting-rod bearings, cylinder liners, aftercooler elements and safety valve components appear more often here because duty cycles are longer.
Screw compressor for X-DF and ME-GA fuel gas	Oil-injected screw · fuel gas	Kobelco	Air compressors	Kobelco calls these oil-injected, or oil-flooded, screw compressors; in 2016 Kobe Steel announced the first order for screw compressors to supply fuel to X-DF dual-fuel engines. Boil-off gas is warmed in a pre-heater, passes a filter and a check valve and is compressed in a single stage, and Kobelco's oil-injected screw range sets capacity with a slide valve. Typical items are suction filter elements, coalescing elements for the secondary oil separator, oil cooler and pre-heater parts, and temperature control valve parts.
Six-stage reciprocating compressor for ME-GI gas supply	Vertical reciprocating · ME-GI	Kobelco	Air compressors	A vertical machine that raises boil-off gas to the injection pressure of the ME-GI engine and also feeds the dual-fuel generator engines and the re-liquefaction plant. Stages one to five run with non-lubricated cylinders; only stage six, where friction is highest, receives lubricating oil, with an oil separator after it. Resin piston rings, rider rings and piston rod packings are the main consumables.
Three-stage non-lubricated compressor for X-DF re-liquefaction	Vertical reciprocating · re-liquefaction	Kobelco	Air compressors	Where an X-DF ship boosts its surplus gas for re-liquefaction with a reciprocating compressor, Kobe Steel's machine for that duty takes the gas from the screw compressor and works without any cylinder lubrication. Kobe Steel standardised its cylinder design with stages three to five of the ME-GI machine to keep the range of consumables small, so a ring or packing request should name the machine and the stage, not only the maker.
MSO compressor (FSRU)	Vertical reciprocating · FSRU	Kobelco	Air compressors	Kobelco also lists vertical reciprocating machines as MSO compressors on floating storage and regasification units. Treat one as a machine in its own right: send the plate and the parts-list page rather than assuming it shares items with an LNG carrier fuel gas unit.
4NES · 6FE	Semi-hermetic reciprocating	Bitzer	Refrigeration compressors	The semi-hermetic reciprocating frames met on provision and air-conditioning plants. Valve plates, gasket sets, piston and ring sets and the oil pump items are the usual lines; the refrigerant and the oil charge belong in the request with the type.
Motor inside the housing	Semi-hermetic identity	Bitzer	Refrigeration compressors	On a semi-hermetic machine the motor sits inside the compressor body, so a winding fault is answered as a unit matter rather than as a component one. That is the fork in the request: valve plate, gaskets and rings are parts, a burnt motor is an exchange, and the two are quoted differently.
Open-drive reciprocating units	Open drive	Bock	Refrigeration compressors	Bock machines are met in the open-drive reciprocating group, where the motor is separate and the crankshaft passes through a shaft seal. That seal is the wear item an open machine adds over a semi-hermetic one, and it belongs on the request beside the valve plate, gaskets and ring set.
5F 20 · 5F 30	5F · reciprocating	Carrier	Refrigeration compressors	The 5F frames are long-serving reciprocating machines, and parts lists for them are drawn per frame rather than per plant. Oil pump, crankshaft, bearings, pistons, valve assemblies and the discharge valve set are the recurring lines.
5H series	5H · reciprocating	Carrier	Refrigeration compressors	The 5H frames sit beside the 5F in the same programme and share the way they are enquired about: frame size, refrigerant and the driver arrangement. State the frame from the compressor plate rather than from the plant nameplate, because one plant can hold more than one machine.
C 55 · 4C 55 · 6C 55 · 8C 55	C series · reciprocating	Daikin	Refrigeration compressors	The C codes are written with the cylinder count in front of the size, and the letters and figures after it carry the execution. Valve plates and reeds, piston and ring sets, gasket kits, shaft seals and bearing sets are the usual scope.
HC 55 · 4HC 55 · 6HC 55	HC series · reciprocating	Daikin	Refrigeration compressors	The HC codes are the neighbouring family, and the extra letter is not decoration: parts are drawn per code. Longer strings such as 4HC552B-UC appear on parts lists, so copy the marking in full from the compressor plate.
V · VT	Open-drive reciprocating	GEA Grasso	Refrigeration compressors	The V and VT series are open-drive reciprocating machines met on larger refrigeration plant. Shaft seal, valve plates, piston and ring sets, connecting rod bearings and the oil pump are the recurring lines; on ammonia plant the refrigerant and the approval paperwork held aboard belong with the request.
Air handling units	Accommodation air · AHU	Heinen & Hopman	Refrigeration compressors	The central units that treat and move air for the accommodation: fan and motor, cooling and heating coils, filters and dampers in one casing. Fan bearings, belts, filters and coil repairs are the recurring lines. The unit plate fixes the drawing they are read against, and where a frequency drive runs the fan, its own plate goes in the request too.
Cabin units	Accommodation · cabins	Heinen & Hopman	Refrigeration compressors	Cabin and room units take conditioned air from the central plant and finish it locally; on some passenger ships they work with variable air volume. Dampers, reheaters where fitted, small fans and the room controller are the usual items, and the controller may carry another maker's label.
Ventilation fans	Supply and exhaust air	Heinen & Hopman	Refrigeration compressors	The fans that move supply and exhaust air through the ship, built into Heinen & Hopman systems. Impeller, bearings, motor and, on belt-driven fans, belts and pulleys are the parts lines. The fan plate and the motor nameplate are read separately, because the motor is often a standard frame from a motor maker.
LeBlanc · Teknotherm on the plate	Maker identity	Heinen & Hopman	Refrigeration compressors	Two companies joined the Heinen & Hopman group and kept their own names: LeBlanc & Associates of Houma, on the US Gulf coast, in 2014, and the refrigeration maker Teknotherm Marine, in which Heinen & Hopman took a majority stake in 2015. A plate reading either name is read as it stands, with its own serial.
N4B · N6BM · N12B	N · reciprocating	MYCOM	Refrigeration compressors	The reciprocating codes are written with the cylinder count between the letters, and a trailing letter marks the execution. Valve plates and springs, piston and ring sets, shaft seal, gasket kits and bearing sets are the usual scope.
Screw compressor frames	Screw	MYCOM	Refrigeration compressors	A screw-programme enquiry starts from the frame and the drive arrangement rather than from the plant. Rotor sets, bearings, shaft seal, the oil separator element and the slide valve items are the components, and the frame designation on the compressor plate is what they follow.
CMO 24 · CMO 26 · CMO 28	CMO · reciprocating	Sabroe / York	Refrigeration compressors	The CMO units are the smaller reciprocating machines of the programme, met as stand-alone or backup compressors. Valve plates, piston and ring sets, shaft seal, gasket kits, oil pump items and bearing sets are the recurring lines.
SMC 104 · SMC 106 · SMC 108	SMC · reciprocating	Sabroe / York	Refrigeration compressors	The SMC frames are the medium-sized reciprocating machines and the ones met most often on marine plant, with TSMC and TCMO naming related builds. Requests cover valve plates and springs, liners and pistons, the shaft seal, connecting rod bearings and complete gasket sets.
SBO 21 · SBO 22	SBO	Sabroe / York	Refrigeration compressors	SBO is an older group still read off plates on working plant, and parts lists for it are drawn per frame. Send the frame from the compressor plate together with the refrigerant, because the elastomers in a gasket set follow the refrigerant and the oil.
BFO 3 · BFO 4 · BFO 5	BFO	Sabroe / York	Refrigeration compressors	The BFO frames are enquired about as complete overhaul scopes more often than as single items: valve assemblies, pistons and rings, bearings, shaft seal and the gasket set together. The designation is written both as BFO 3 and BFO3 on parts lists, so both spellings find the same machine.
SAB · SGC	Screw compressors	Sabroe / York	Refrigeration compressors	Larger screw compressor units used on bigger reefer and industrial installations, less common on general cargo tonnage. Rotor sets, bearings and shaft seal parts are ordered against the unit serial rather than the family name.
Sabroe plate, York or Johnson Controls paperwork	Maker identity	Sabroe / York	Refrigeration compressors	The compressor plate, the plant documentation and the invoice can each carry a different one of these names, and the type designations did not change between them. Send the plate as it reads and the type code beside it; the corporate name is context rather than identity.
Auxiliary and main engine fits	Engine context	KBB	Turbochargers	The same frame size behaves differently on a constant-speed generator set and on a variable-load propulsion engine. Tell us the duty, the fuel in use and the hours since the last overhaul — these change which wear items are worth reviewing together.
Bearing bushes and thrust bearing	Rotor support	KBB	Turbochargers	Radial bearing bushes run in the bearing casing on engine lube oil, with an axial thrust bearing taking the pressure difference across the rotor. Clearance growth here typically shows up as rising vibration and noise, increased oil throughput, and — once rotor position degrades enough to allow rubbing — loss of charge air pressure. Report rotor axial and radial clearance readings with the RFQ.
Cartridge group requests	Assembly level	KBB	Turbochargers	A cartridge group carries the rotor, bearing casing, bearing bushes and sealing bushes as one balanced assembly. State in the RFQ whether the vessel plans an exchange overhaul or a component-level rebuild, because the two produce completely different item lists.
Casings, nozzle rings and shroud rings	Gas path	KBB	Turbochargers	The gas inlet casing carries a turbine nozzle ring that sets the flow geometry into the wheel, with a separate shroud ring protecting the casing itself. Thermal cycling on heavy fuel distorts and cracks these parts, and deposits on the nozzle ring reduce effective turbine area, which drives turbocharger speed and charge air pressure up and shifts exhaust temperatures across the engine.
Filter silencer and oil supply	Intake and oil	KBB	Turbochargers	The filter silencer element is the simplest part on the machine to renew and the one most often left too long; a blocked mat raises exhaust temperatures across every cylinder. Oil inlet fittings, restrictors and screens belong in the same RFQ, because bearing life follows oil condition.
HPR frames — the earlier radial generation	KBB HPR series	KBB	Turbochargers	HPR designations are the family letters plus a size number, for example HPR3000 through HPR6000 — the earlier generation that ST went on to replace at a higher pressure ratio. ST designations may additionally carry a variant suffix. Either way it is the specification number on the plate, not the designation, that defines the build.
Legacy R-series	KBB R series	KBB	Turbochargers	Older R-series machines are still running on long-lived medium-speed installations, and they use a water-cooled bearing housing, so cooling-side parts belong in the same request. These requests usually need more evidence than those for current frames — plate photographs, a component photograph and the engine type — because the printed spares documentation on board is often the only remaining reference.
Nozzle ring and diffuser variants	Matching-critical	KBB	Turbochargers	Turbine nozzle rings and compressor-side diffusers exist in more than one variant per frame, and the specification number is what separates them. A part that bolts up correctly can still shift the matching of the engine, so the matching reference from the technical file belongs in the RFQ next to the designation.
One-piece turbine wheel	Turbine side	KBB	Turbochargers	Exhaust gas enters the wheel radially at its periphery through the gas inlet casing and nozzle ring, turns, and discharges axially through the exducer at the wheel eye. The wheel is a single nickel-alloy casting joined to the shaft, so a bent or eroded blade is not an individual blade order — it moves the request to a shaft assembly or a cartridge.
Radial compressor wheel	Compressor side	KBB	Turbochargers	The aluminium compressor wheel is a life-limited item on many KBB installations, counted in running hours rather than replaced on condition. Bore and back-face fatigue, plus foreign-object damage from debris drawn through a tired filter silencer, are the usual reasons a wheel comes off before its hour limit.
Sealing bushes at both ends	Sealing	KBB	Turbochargers	Sealing bushes separate the oil space from the gas and air sides. When they wear, oil migrates towards the compressor casing or into the exhaust — oily charge air, deposits in the cooler, or a smoking uptake are the symptoms an engineer reports before the parts list is written.
ST frames — the principal radial family	KBB ST series	KBB	Turbochargers	ST-series machines, including the current ST27 and ST27-EP, are KBB's principal radial family on medium-speed auxiliary sets and main engines. Typical items are cartridges, shaft assemblies, plain bearings, sealing bushes, nozzle rings and filter silencer elements.
NA series	NA · axial	MAN	Turbochargers	The NA units have been in service for decades on two-stroke and four-stroke engines and are still the plate read on many installations. Rotor blades, nozzle rings, labyrinth seals, diffusers, journal and thrust bearings and complete cartridge assemblies are the recurring lines.
NR series	NR · radial	MAN	Turbochargers	The NR units cover the small and medium frames, and their bearing arrangement was carried forward into the later programme. Nozzle rings, compressor wheels, bearing bushes and thrust rings, seal sets and cartridge assemblies are what an overhaul on these units usually needs.
TCA series	TCA · axial	MAN	Turbochargers	TCA is the axial-flow programme that followed NA, offered for diesel, dual-fuel and gas engines. Wide-chord turbine blades, nozzle rings, compressor wheels and volutes, bearing housings and seal sets are the usual scope; the type plate on the casing carries the frame size the parts follow.
TCR series	TCR · radial	MAN	Turbochargers	TCR is the radial programme of the same generation, offered with variable turbine geometry and with turbine cooling as options. Because those options change the turbine end, state whether they are fitted before a nozzle ring, rotor or cartridge is quoted.
The turbocharger has its own plate	Unit identity	MAN	Turbochargers	On an engine of any real size the turbocharger is a separate assembly with a type designation and a serial of its own, and the engine identity alone does not reach the parts. Read the unit plate, and note whether the request is for a cartridge exchange or for loose components, because the two are quoted differently.
Compact Performance series	Spring-loaded & Compact Performance series	LESER	Valves	The compact line, quoted against the type designation and the orifice designation carried on the valve itself rather than against the series name. Where a valve of this line is on a machinery-space position, the orifice designation is the field that keeps a disc or seat component on the right size.
High Performance series	Spring-loaded & High Performance series	LESER	Valves	Scoped from the type designation, the orifice designation and the set pressure recorded for the position the valve protects. On this line the same body size is built in more than one internal arrangement, so the type designation has to be sent in full — every character of it, as stamped.
Modulate Action series	Modulate Action series	LESER	Valves	The modulating line. As with the spring-loaded series, it is the type designation and the orifice designation on the valve that decide the internals, not the series name, and the medium the valve sees decides the soft-seal specification.
Series 810 and 820 — pilot-operated relief valves	Pilot-operated & series 810 and 820	LESER	Valves	Pilot-operated relief valves carry pilot components in addition to the main valve internals, so they are scoped differently from a spring-loaded valve: the pilot is a request line of its own. LESER holds a DNV GL Type Approval Certificate for the series 810 and 820 pilot-operated relief valves; that certificate applies to those series and is not read across to the other lines.
Steam, water, fuel, lubrication and cargo duty	Systems protected on board	LESER	Valves	The same valve series turns up on steam, water, fuel and lubrication systems, and on LNG/LPG cargo systems including FPSO installations. The system a valve protects, and the medium and temperature it actually sees, decide the soft-seal and bellows specification — which is why the duty is asked for before any seal item is put on a line.
Types 526 and 441 — horizontal and suspended installation	Marine installation & types 526 and 441	LESER	Valves	Types 526 and 441 are documented for horizontal and suspended marine installation. Where one of these is fitted, state the installation arrangement alongside the type designation, since mounting-related components and the way the valve is supported belong in the same enquiry as the internals.
D2866 · D2876	MAN High-speed	MAN / MAN B&W	Engines	High-speed marine diesels for fast craft and service vessels. Pistons, liners, injectors, turbocharger units, water pump assemblies.
G80ME-C / S90ME-C	MAN B&W ME-C Series	MAN / MAN B&W	Engines	Electronically controlled 2-stroke engines. HCU components, exhaust valve actuators, Alpha lubricators, cylinder liner kits.
L16/24 · L21/31	MAN Four-stroke · Holeby	MAN / MAN B&W	Engines	Compact Holeby genset engines. Piston rings, cylinder liners, fuel injection pumps, charge-air cooler elements, main bearing shells.
L27/38 · V28/32S	MAN Four-stroke · L/V	MAN / MAN B&W	Engines	In-line and V-form medium-speed engines for genset and propulsion duty. Cylinder liner sets, fuel injection equipment, valve-drive components, cooling circuit overhaul kits.
L28/32 · L23/30	MAN Four-stroke · Holeby	MAN / MAN B&W	Engines	Medium-speed auxiliary engines. Cylinder heads, connecting rod bearings, injection nozzles, turbocharger cartridges, gasket sets.
L23/30H · L23/30H-Mk2 · L23/30H-Mk3	MAN Four-stroke · Holeby	MAN / MAN B&W	Engines	Auxiliary GenSet: the engine and an alternator from another maker share one base frame, and the Mk after the H is part of the designation. Cylinder heads, liners, pistons stated by Mk, connecting rods and bearing shells, fuel injection pumps, injector nozzles, turbocharger cartridges, overhaul gasket kits.
M20 · M25 · M32 · M43	MaK Medium-speed	MaK	Engines	MaK in-line and V-type diesels. Cylinder heads, valve seat inserts, injection equipment, governor parts, cooling system spares.
S70MC / S80MC	MAN B&W Two-stroke	MAN / MAN B&W	Engines	Large-bore slow-speed main engines. Cylinder liners, piston rings, stuffing box seals, turbocharger nozzle rings, camshaft drives.
S50MC · S50MC-C	MAN B&W Two-stroke	MAN / MAN B&W	Engines	Camshaft-controlled super-long-stroke main engine; on the S50MC-C the Mark number changes components within one designation, and the plate often names the licence builder. Cylinder liners, piston crowns and rings, stuffing box parts, exhaust valve spindles and seats, fuel pumps, injector nozzles, crosshead and main bearings.
S60ME-C	Two-stroke, ME-C electronic	MAN / MAN B&W	Engines	The ME-C generation replaced the camshaft with a hydraulic-electronic system on both the fuel and exhaust sides. HCU units, control valves, boosters and exhaust valve actuators have no MC-series equivalent, and an MC or MC-C part number does not necessarily work on an ME-C engine of the same bore.
D2676 LE4xx	In-line six	MAN Engines	Engines	The current in-line six-cylinder engine with common-rail injection, in light, medium and heavy duty versions. It took over from the D2866 and D2876. Filters, injectors, cooler elements and gasket sets are quoted against the full LE version and the serial.
D2862 LE44x · LE446 · LE456	V12	MAN Engines	Engines	The twelve-cylinder V engine, offered in light, medium and heavy versions and as a heavy-duty engine for tugs and cargo vessels. Versions such as LE446 and LE456 are separate builds of the same type, so the version number goes into every line.
D2868 LE4xx	V8	MAN Engines	Engines	The eight-cylinder V engine of the same generation, in marine versions for lighter duty among others. Parts are quoted against the complete code and serial, with the duty class noted in the enquiry.
D2866 · D2876 LE4xx	Earlier in-line six	MAN Engines	Engines	The in-line sixes the D2676 replaced, still common on fishing vessels and workboats; the D2876 ran in LE401, LE402, LE404 and LE405 versions among others. The version is copied from the plate, and items revised since the build are named in the reply.
D2842 LE4xx	Earlier V12	MAN Engines	Engines	The earlier V12 marine engine, met in versions such as LE409 and LE410. Photographs of the plate, the engine and the removed part support the enquiry when the plate is hard to read.
M 32 C	In-line long-stroke, medium-speed	MaK	Engines	The M 32 C is MaK's in-line long-stroke build; the V-form VM 32 C is a separate engine under the same family name and not automatically interchangeable on cylinder-head or liner parts. MaK is now a Caterpillar programme, and parts are still supplied even though the M-series is out of production.
6L35MC · 5L35MC MK6	MC type · camshaft-controlled	Makita	Engines	The engine Makita's two-stroke business grew from. B&W approval for the L35MC/MCE came in 1981, the first 6L35MC built anywhere left the Takamatsu works in 1982, and the 5L35MC MK6 power-up version followed in 1993. Makita still calls the L35MC the world standard for small bore. Fuel injection, starting air and exhaust timing all run off the camshaft, so a fuel pump or cam line on this engine has no ME-B counterpart.
4S26MC · S42MC · 6S50MC MK6	MC type · super-long-stroke	Makita	Engines	The S frames Makita built on the camshaft principle: the 4S26MC completed in 1988, the S42MC that still appears on its MC product page, and the 6S50MC MK6, which Makita's history records in 2001, the year a test bed for the S50MC was completed at the works. An S50MC from Makita is reviewed against the type described on our S50MC page, with Makita's own build data added.
S30ME-B9 · 6S30ME-B	ME-B type · electronic control	Makita	Engines	Makita completed the first 6S30ME-B anywhere in 2014 and presents the S30ME-B as the successor to the L35MC. Injection and cylinder lubrication are timed electronically instead of by cam, which brings control and actuation components that no MC engine carries, and an Alpha lubricator, for which Makita has published its own emergency-operation video.
6S35ME-B · 6S46ME-B	ME-B type · electronic control	Makita	Engines	Both were completed at Makita in 2013 as the first of their type built in Japan, the year the company began producing electronically controlled engines. An ME-B plate is a parts route of its own: a part number taken from an MC engine of similar bore is not carried across without a check.
L21/31 Mk2 · L21/31 Mk2 PLO	MAN Four-stroke · Holeby	MAN	Engines	Second build of the Holeby GenSet; PLO is the part-load optimised version. Cylinder heads and valves, liners, pistons and ring sets, bearing shells, injection pumps and injectors, charge air cooler elements. State Mk2 and PLO.
L21/31DF-M	MAN Four-stroke · methanol dual-fuel	MAN	Engines	Methanol GenSet built on the L21/31 Mk2 with port fuel injection. Methanol injectors and supply items, plus cylinder-unit and running-gear parts of the base engine, quoted against the DF-M documents.
S6R-MPTK	Mitsubishi S-series 4-stroke	Mitsubishi	Engines	S6R-MPTK RFQs can include cylinder-liner kits, valve seat inserts, fuel injection pumps, governor parts and gasket sets. Confirm serial/build and generator-set evidence.
S6U-MPTK	Mitsubishi S-series 4-stroke	Mitsubishi	Engines	S6U-MPTK RFQs can include cylinder heads, piston kits, connecting rod bearings, injection nozzles, turbocharger parts and cooling-system spares. Confirm serial/build and generator-set evidence.
UEC33LSE	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC33LSE RFQs can include cylinder liners, pistons, exhaust valves and fuel injection pumps. Confirm serial/build, installed configuration and part evidence.
UEC37LA	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC37LA RFQs can include piston rings, cylinder heads, turbocharger nozzle rings, stuffing-box seals and crosshead bearings. Confirm build evidence.
UEC45LA	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC45LA RFQs can include liners, piston crowns, exhaust valves, fuel injection equipment and camshaft-drive components. Confirm the approved overhaul scope and build evidence.
UEC50LSE	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC50LSE RFQs can include cylinder-liner kits, piston assemblies, exhaust valve spindles and seats, turbocharger cartridges and connecting-rod bearings.
UEC52LA	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC52LA RFQs can include main bearings, crankpin shells, cylinder heads, fuel injection pumps and plungers, and governor components. Confirm build evidence.
UEC60LS	Mitsubishi UEC 2-stroke	Mitsubishi	Engines	UEC60LS RFQs can include pistons, liners, exhaust valves, turbocharger interface parts, stuffing-box seals and overhaul gasket kits. Confirm build evidence.
S90ME-C · G95ME-C	MITSUI-MAN B&W · ME-C	Mitsui E&S	Engines	Electronically controlled ME-C engines are what Mitsui's own milestone releases name: an 11S90ME-C10.5 in 2018 and a 7G95ME-C10.6-EGRTC in 2024. The Mark number after the designation and a suffix such as EGRTC are part of the type, and they decide which variant of an item fits.
ME-GI · ME-GIE · ME-LGIM · ME-LGIP	MITSUI-Everllence B&W · dual fuel	Mitsui E&S	Engines	Mitsui lists dual-fuel B&W engines for methane, ethane, methanol and LPG, and records the first methanol dual-fuel engine anywhere in 2015 and the first ethane dual-fuel engine anywhere in 2016. GI and LGI valve items follow the fuel suffix, which is why it belongs in the enquiry.
MC	MITSUI-MAN B&W · camshaft generation	Mitsui E&S	Engines	Mechanically controlled MC engines are the generation before ME, and Mitsui's main engine remote control series was supplied for both. On an MC engine the fuel pump, its roller guide and the camshaft drive do the work of the hydraulic items on an ME-C, so the generation changes the parts list as well as the type.
X · X-DF · X-DF-M · X-DF-A	DU-WinGD · Mitsui E&S DU	Mitsui E&S	Engines	Since April 2023 the former Diesel United works at Aioi has belonged to the group as Mitsui E&S DU, building WinGD designs. In 2026 the first WinGD engine was also completed at Tamano, a DU-WinGD 6X82DF-M-1.0 LP-SCR. A DU-WinGD plate is a WinGD design, so the X or X-DF type decides the catalogue, not the B&W one.
SJ-G · SJ-H	Selfjector purifier, four generations	Mitsubishi	Separators	Four Selfjector generations answer to the SJ prefix, and a Korean-built vessel may carry a plate reading Samgong-Mitsubishi rather than Mitsubishi outright — the same machine under a licence-build name. Bowl components, disc stacks, the gravity disc and operating-water items are the recurring lines.
8V 2000 M70/M72	MTU Series 2000	MTU	Engines	Compact 8-cylinder Series 2000 for fast craft and service vessels. Cylinder heads, fuel injectors, pistons, cooling system parts, electronic control modules.
12V / 16V 2000 M70/M72/M86/M93	MTU Series 2000	MTU	Engines	Mid and large Series 2000 configurations. Injection nozzles, cylinder liners, turbocharger cartridges, fuel pump assemblies, gasket and seal kits.
12V 4000 M70/M73/M90	MTU Series 4000	MTU	Engines	High-power 12-cylinder Series 4000. Injectors, cylinder heads, piston and liner kits, turbocharger components, fuel system parts, ECS control units.
16V 4000 M90/M93	MTU Series 4000	MTU	Engines	16-cylinder high-speed marine engine. Cylinder heads, pistons, liners, common rail fuel system components, cooling circuit parts, bearing shells.
20V 4000 M90/M93	MTU Series 4000	MTU	Engines	20V 4000 M90/M93 RFQs can include injectors, cylinder heads, turbocharger assemblies, piston and liner kits, fuel-system and electronic-control spares.
Series 4000, C variants	MTU Series 4000	MTU	Engines	Series 4000 C-suffix builds (industrial and workboat applications), produced under the Rolls-Royce Power Systems structure. Cylinder heads, injectors, pistons, liners, turbocharger cartridges, electronic control.
Series 396	MTU Series 396	MTU	Engines	Series 396 RFQs can include injectors, cylinder heads, pistons, liners and turbocharger components. Confirm the complete model and serial/build evidence.
Series 8000	MTU Series 8000	MTU	Engines	Large-displacement high-speed marine diesel. Injector assemblies, cylinder heads, turbocharger components, fuel system, cooling system, ECU parts.
Control valves, cylinder valves, regulating valves and safety valves	Control and line valves	Nakakita	Valves	Alongside the butterfly line, Nakakita builds control valves, cylinder valves, regulating valves and safety valves. Documented service for the control valves and their controllers includes main-engine fuel-oil heating, cooling fresh-water and lube-oil systems, where the valve and the controller are two halves of one loop and are best identified together.
Metal-seated valves with Stellite seat facing	NS-C — metal-seated execution	Nakakita	Valves	The metal-seated execution uses a Stellite seat facing. Where a valve has been opened and the seat face is marked, the disc is normally inspected in the same breath, because the two components decide together whether the valve will hold once it is closed up again.
NS-C double-eccentric butterfly valves	Butterfly valves — NS-C series	Nakakita	Valves	The NS-C series is Nakakita's double-eccentric butterfly valve line, with more than 100,000 units delivered according to the manufacturer. Double-eccentric geometry lifts the disc clear of the seat as it opens, which is why the seat face, rather than the disc, is usually the first component discussed when one of these valves is opened up.
PTFE-seated valves	NS-C — PTFE-seated execution	Nakakita	Valves	The PTFE-seated execution is the third seat variant offered on the NS-C series. It is the execution most often mis-stated in an enquiry, since a PTFE seat and a rubber seat are not always easy to tell apart in a photograph taken with the valve closed; a photograph of the seat face with the disc part-open removes the doubt.
Resilient-seated valves	NS-C — rubber-seated execution	Nakakita	Valves	The rubber-seated execution of the NS-C series takes its own seats and seat rings. Two valves of the same nominal size will not share seat parts across executions, so it is worth stating the seat variant in the first message rather than discovering it after a quotation has been prepared against the wrong build.
Valve remote-control systems	Remote control — cargo, ballast, bilge	Nakakita	Valves	Nakakita also supplies valve remote-control systems for cargo and ballast lines and for bilge piping. On these installations the fault reported from the console and the fault present at the valve are not always the same one, so the actuator, the control medium and the valve itself are described as a set when the request is prepared.
STK	Centralized hydraulic VRC — rotary	Pleiger	Valves	Rack-and-pinion hydraulic actuators for butterfly and ball valves, double- or single-acting, designed for dry, submerged or hazardous-area positions; in an emergency every one can be worked by hand pump. Single-acting units add a spring assembly, and Pleiger lists that spring-return version of the STK as STKG. Seal kits, indication items and the coupling to the valve are the lines a request usually covers.
PVK	Centralized hydraulic VRC — linear	Pleiger	Valves	Hydraulic linear actuators for globe valves, double-acting or single-acting with fail-safe spring return, with a hydraulic override available. Seal kits, override items and the spring set on single-acting units are the recurring lines.
EHS-D3	Electro-hydraulic VRC (EHS) — rotary	Pleiger	Valves	An EHS power pack on a double-acting STK actuator in one closed unit, for open/close and continuous duty, with electric limit switches, an optical position indicator and hand-pump emergency actuation. Limit switches, the indicator and terminal box items are looked at before the power pack.
EHS-SG · EHS-S/G	Electro-hydraulic VRC (EHS) — spring return	Pleiger	Valves	Single-acting electro-hydraulic actuators with spring return: EHS-SG in rotary form, EHS-S/G in linear form. State which of the two is fitted, because the rotary and linear units take different seal and spring items.
EHS-Q	Electro-hydraulic VRC (EHS) — separate power pack	Pleiger	Valves	A power pack unit installed apart from its linear or rotary actuator, for valve positions that are dry, submerged or in a hazardous area. The request names both halves, the power pack and the actuator it drives, with a photograph of each plate.
EHS-EX · EHS-UM	Electro-hydraulic VRC (EHS) — special duty	Pleiger	Valves	EHS-EX covers explosion-proof double- and single-acting rotary and linear actuators, and the maker presents an arctic EHS-EX power unit for hazardous areas under its LNG heading; EHS-UM is a double-acting rotary actuator for permanent submersion. The Ex marking or the submerged execution is part of the identification.
RK 16/8 · CCM · CM4 · BI	Valve cabinets and control modules	Pleiger	Valves	Pleiger Control Modules for solenoid valve cabinets and consoles: BI bus interface, RK 16/8 relay module for centralized actuators, CCM Conti Control Module for continuous position, CM4 for EHS units, IO 8/8/4 and IO/TII input-output modules, and CM-ExE for explosion-proof EHS. Each module is identified by its type designation and the cabinet it sits in.
PCL · PPC	Control systems	Pleiger	Valves	Pleiger Control Loop (PCL) carries power and data to EHS actuators, pumps and tank sensors on one cable loop; Pleiger Process Control (PPC) is the PC-based control system for valve and pump automation, tank measuring, bilge automation, ballast water exchange and heeling automation. Requests name the node or station, not only the system.
FT14	Ball float traps	Spirax Sarco	Valves	A float and thermostatic trap with an integral automatic air vent, for coils and heat exchangers where the condensate load varies. Float and valve assemblies, air vent elements and cover gaskets are quoted against the trap type and the body marking.
TD52 · TD52M · TD52L	Thermodynamic traps	Spirax Sarco	Valves	Thermodynamic traps for small loads such as steam main drainage, including a low-capacity TD52L and the TD52M. Discs, caps and strainer screens are matched to the exact variant on the body, which is part of every order line.
BPT13 · BPT13A · BPT13S	Thermostatic traps	Spirax Sarco	Valves	Balanced pressure thermostatic traps, standard as the BPT13A with angled connections, with a version offered for shipboard steam lines. Capsules, valve seats and gaskets are quoted against the full type and the body marking.
700G	Rubber-seated · wafer body	Tomoe	Valves	Tomoe's rubber-seated butterfly valve for general service, built as a wafer body clamped between two pipe flanges. Supply records show it with an NBR seat and a stainless steel disc, worked by hand or by an actuator. Seat rings, discs, stems with their seals and the operator are the recurring lines, each read against the full 700G code on the valve.
705G	Rubber-seated · semi-lug body	Tomoe	Valves	The semi-lugged version of the 700G. Ship-supply catalogue entries carry it with a worm gear, a lock lever or a centre handle, and with an NBR seat. A 705G is not ordered from a 700G list of the same size: seat ring, disc and operator parts are taken from its own code and plate.
Ballast service	Vertical centrifugal	Naniwa	Pumps	Intermittent, high-flow duty with sediment and shell growth in the water. Over service life, wear ring clearance and impeller eye erosion decide how much of the rated duty the pump still delivers. Within a single deballasting operation the limit is different — as tank level falls, available NPSH drops and the pump approaches cavitation or loses suction, which is why ballast sets are commonly backed by a vacuum priming system for stripping.
Bilge & general service	Self-priming	Naniwa	Pumps	A recirculation chamber lets the pump clear air from a lifted suction line. Failure to prime is usually traced to loss of the liquid charge in the priming chamber, air ingress at suction line joints, mud box covers or valve glands, or a leaking gland and scored sleeve. Worn impeller front clearance also matters directly here — in a self-priming pump that clearance is what generates the vacuum, so it is checked before the pump is condemned.
Central fresh water cooling	Vertical centrifugal	Naniwa	Pumps	Closed-circuit duty running near-continuously. Wear is slower than on the sea water side, so the recurring items are the mechanical seal, bearings and casing gasket rather than the hydraulic parts.
Close-coupled vs separately coupled	Drive arrangement	Naniwa	Pumps	Some units carry the impeller on an extended motor or stub shaft; others use an intermediate shaft, a rigid coupling and their own bearing housing on the pump. The two arrangements need different shafts, sleeves and bearing covers even at the same hydraulic size.
Fire & emergency fire	Vertical centrifugal	Naniwa	Pumps	Class-surveyed duty tested against a required pressure at a stated number of jets. Restoring a failed pressure test is generally a wear ring, impeller and seal question, and the survey context decides which route is acceptable. Note the split: the main fire pump sits in the machinery space, while the emergency fire pump is a separate unit sited outside it with an independent driver and its own priming arrangement, so its parts list and its survey context are not the same.
Packed gland vs mechanical seal	Sealing arrangement	Naniwa	Pumps	Older units frequently left the yard with a packed gland and lantern ring; many have since been converted to a cartridge mechanical seal. Confirm what is actually installed — the conversion changes the sleeve and the stuffing box parts, not only the seal.
Sanitary & domestic water	Self-priming / centrifugal	Naniwa	Pumps	Small-frame units cycling on a pressure switch. Frequent starts load the bearings and seal faces, so ball bearings, seal kits and the lip seals and O-rings in the bearing covers are the common replacements. Short-cycling on this duty usually points at a waterlogged hydrophore tank rather than the pump.
Sea water cooling	Vertical centrifugal	Naniwa	Pumps	Motor mounted on top of a lantern-type motor stool, single-stage impeller drawing from the sea chest line. Typically a cast iron casing with bronze (BC6 / CAC406) impeller and wear rings, stainless steel shaft, and a renewable sleeve through the stuffing box. Some sea water builds are all-bronze or aluminium-bronze — confirm from the nameplate or the section drawing. Impeller vane erosion and wear ring opening dominate the overhaul list.
NEMO BY	Progressing cavity · block design	NETZSCH	Pumps	The compact NEMO execution: the drive is flanged straight onto the pump lantern, and a coupling rod with two joints carries the drive to the rotor. The rotor turns eccentrically inside a fixed stator, so on oil sludge, bilge and oily-water duty the wear concentrates in the stator and in the joints that drive the rotor.
NEMO SY	Progressing cavity · bearing housing	NETZSCH	Pumps	A NEMO with its own bearing housing: a large double bearing, a two-part shaft and a free shaft extension, so the pump can take an electric, hydraulic or diesel drive. An SY adds bearing-housing bearings and seals to the parts list; rotor, stator and joint parts are read the same way as on a block pump.
NEMO FSIP · FSIP.ready · FSIP.advanced · FSIP.pro	Progressing cavity · Full Service in Place	NETZSCH	Pumps	FSIP gives the suction housing a large inspection cover. FSIP.ready adds the cover; FSIP.advanced adds a split coupling rod, joined to the rotor by a sleeve coupling on a single screw, so rotor and stator are changed with the pump left in its pipework; FSIP.pro adds a cartridge mechanical seal that comes out through the same opening. Installed BY and SY pumps of the sizes NETZSCH lists can be converted, so the housing on board may be newer than the order documents.
iFD-Stator 2.0 · xLC	Stator builds	NETZSCH	Pumps	A conventional NEMO stator has its elastomer vulcanised into the tube with seals at both ends, and the whole stator is the spare. The iFD-Stator 2.0 keeps a reusable two-part housing with a polygonal profile and renews only the NEMOLAST elastomer part inside it. Where an xLC unit sits on the stator flange, it compresses the elastomer axially to restore the preload between rotor and stator as wear sets in.
NOTOS 2NS · 3NS · 4NS	Multi-screw	NETZSCH	Pumps	NETZSCH's marine material puts NOTOS 2NS and 3NS pumps on lube oil, hydraulic units and fuel transfer and supply to the engines, the 3NS on lube oil for steering gear and controllable pitch propellers, and the 2NS and 4NS on bunkering. The 4NS is a geared twin-screw pump. A NOTOS request is read against spindles, bearings and shaft seals, never against a stator.
TORNADO T.Envi · N.Mac · M-Ovas	Rotary lobe and grinding	NETZSCH	Pumps	TORNADO rotary lobe pumps turn up on sewage, wastewater and ballast duty and on waste-oil and oily-water transfer; NETZSCH presents the T.Envi as the execution adapted to service at sea, with metal-elastomer lobes, elastomer inserts and an oil-free toothed-belt synchronising drive. On passenger ships an N.Mac or M-Ovas macerator is often fitted ahead of the sewage pump to cut solids.
297 frames	Frame range	Napier	Turbochargers	297-frame requests arrive written as NA297 or simply as “297” copied from a stores list. The 297 and 357 frames belong to the NA 7 Series (NA297, NA307, NA357, NA397); Napier’s NT machines are designated differently (NT1-10, NT1-12, NT1-14, NT2-26, NT2-28), so confirm the full designation as stamped before a rotor, cartridge or nozzle ring line is quoted.
357 frames	Frame range	Napier	Turbochargers	Larger-frame 357 requests are typically overhaul-driven: blade sets, nozzle rings, thrust arrangements and casing hardware quoted together against one docking window.
Blading and nozzle ring	Gas side	Napier	Turbochargers	Heavy fuel ash and unburnt residue build up on the turbine blades and on the nozzle ring vanes, then erode them. Thermal cycling adds cracking at the vane trailing edges and root fillets. Blades sit in machined roots with locking hardware, so damaged blading is normally treated as a set, not as a single replacement blade.
Complete cartridge requests	Assembly level	Napier	Turbochargers	A cartridge line covers the balanced rotor with its bearing housing and seals as one package. Exchange or core-return conditions attached to that route are read line by line during review.
Compressor wheel and diffuser	Air side	Napier	Turbochargers	Oil mist, salt and dust glaze the compressor wheel and the diffuser passages, blunting the blading and pushing the machine toward surging. Tip rub after a bearing problem leaves witness marks on the shroud line. Wheel and diffuser are matched to the frame build, so both are usually reviewed together.
Filter silencer and casing hardware	Intake and casings	Napier	Turbochargers	A loaded filter silencer starves the machine of air and drags efficiency down before anything mechanical fails. On the hot side, gas-inlet and gas-outlet casings suffer distortion, gasket-face erosion and stud damage over repeated overhauls, and casing hardware is worth listing in the same RFQ as the rotating parts.
Journal and thrust bearings, seals	Rotor support	Napier	Turbochargers	Plain journal bearings and the thrust arrangement depend on clean, uninterrupted oil. Contamination, a short oil interruption on shutdown or a blocked supply line shows up as bearing wear, rising vibration and then rotor contact. Worn labyrinth seals let oil migrate toward the gas path or exhaust gas into the bearing space.
Medium-speed auxiliary sets	Engine duty	Napier	Turbochargers	Auxiliary and propulsion four-stroke installations. Provide the engine make and type alongside the turbocharger plate — the same frame is built to different specifications for different engine applications.
Multi-engine gensets and propulsion sets	Engine duty	Napier	Turbochargers	Where several medium-speed engines in one machinery space carry the same frame, state whether the RFQ covers one machine or the full set, and whether the units carry different build or rotation records after earlier renewals.
NA axial machines	Napier NA 7 Series	Napier	Turbochargers	The long-running axial family — NA297, NA307, NA357 and NA397 — found on both propulsion and generator duty. Requests usually open with a rotor assembly, turbine blading, a nozzle ring or a bearing set rather than a single fastener.
NT axial machines	Napier NT Series	Napier	Turbochargers	A separate, later axial product line (NT1-10, NT1-12, NT1-14), not a continuation of the 7-Series frames. Higher pressure ratios and its own sizing and drawing set — nothing crosses over from an NA machine. Copy the NT designation exactly as stamped, including the size suffix, for example NT1-12.
Older and out-of-production frames	Legacy frames	Napier	Turbochargers	Machines no longer in current production are reviewed against the evidence the vessel actually holds: plate photographs, old overhaul reports and clearance records rather than assumed catalogue continuity.
MET-MA · MET-MB	Axial turbocharger, plus earlier MET-SE	Mitsubishi MET	Turbochargers	MET-MB is Mitsubishi's current axial turbocharger family, fitted on MAN B&W, WinGD and J-ENG two-stroke engines; MET-MA is the generation it replaced and MET-SE is earlier again, both still found on plates in service. State which engine platform the turbocharger serves alongside the MET type, since mounting and casing interfaces follow the engine, not the turbocharger type alone.
GX-3R and GX-3R Pro — compact personal instruments	Portable · GX-3R series	Riken Keiki	Gas detection	Small enough to be worn rather than carried. The Pro can be configured for as many as five gases, combining LEL, oxygen, hydrogen sulphide and carbon monoxide with a toxic option such as HCN, NH3, NO2, PH3, SO2 or CO2, which is why two instruments with the same name on the case can need entirely different cells.
GX-9000 and GX-9000H — expandable four to six gas	Portable · GX-9000 series	Riken Keiki	Gas detection	Leaves the works with the four standard gases O2, H2S, CO and HC and two further sensor slots that may or may not have been filled on board. The GX-9000H is a high-range hydrogen sulphide variant aimed at oil tankers, so the range, not only the gas, has to be stated when a cell is requested.
GX-6000 · GX-Force	Portable · GX-6000 & GX-Force	Riken Keiki	Gas detection	The GX-6000 covers as many as six gases including volatile organic compounds, which brings a different sensor family into the same instrument. The GX-Force is a four-gas instrument. Both are ordered by the gases actually fitted rather than by the maximum the body will accept.
RX-8500 — LNG cargo monitoring	Portable · cargo duty	Riken Keiki	Gas detection	Built for LNG carrier cargo monitoring with an infrared methane sensor covering 0-100% LEL and 0-100% by volume with autoranging. An infrared sensor is a different part from the catalytic element used elsewhere for combustibles, and is treated as its own line on an enquiry.
SC-01 — single toxic-gas monitor	Fixed · single-gas	Riken Keiki	Gas detection	Built around interchangeable smart sensors that the monitor recognises automatically, so changing the target gas does not call for reconfiguration. That design turns the sensor into a routine consumable, and makes the target gas and range the decisive fields on the RFQ line rather than the monitor type.
SD-1 — smart transmitter and detector head	Fixed · detector heads	Riken Keiki	Gas detection	A fixed head with an integrated display, measuring combustibles such as methane and other hydrocarbons alongside toxic hydrogen sulphide and carbon monoxide. Because the head carries its own display and smart sensor, the sensor and the transmitter are separable items on a parts list.
SD-3 — fixed marine detection system	Fixed · ship systems	Riken Keiki	Gas detection	Installed for engine rooms, pump rooms, bilge areas, ballast tanks and accommodation spaces. A system enquiry usually reaches a supplier as a list of heads, sensors and calibration items for several spaces at once rather than as a single part.
Ballast service	Duty	Shinko	Pumps	Intermittent, heavily loaded, often run with air entrained during stripping. Seal faces and shaft sleeves take the damage, and wear ring clearance opens faster than the running hours alone would suggest.
Bilge and general service	Duty	Shinko	Pumps	Solids in the pumped medium score seal faces and sleeves. Many of these units still run gland packing, so packing rings, the lantern ring and the sleeve are listed together with the gland studs and nuts.
Cooling seawater service	Duty	Shinko	Pumps	The hardest life of any pump on board. Bronze impellers suffer cavitation and erosion-corrosion at the vane inlet edges and in the suction eye, wear rings open up, and seal faces suffer from silt drawn through the sea chest. Casing material on the nameplate must be read before any wetted part is requested.
Fire service	Duty	Shinko	Pumps	Rarely run, surveyed regularly, and expected to reach rated head on demand. Requests are usually driven by a survey finding on capacity or on gland leakage, so the head and capacity figures on the nameplate belong in the RFQ.
Fresh water cooling service	Duty	Shinko	Pumps	Cleaner water, longer intervals, but seal faces still glaze and coupling rubbers still harden with engine-room heat. Requests here are typically seal kits, gasket sets and bearings rather than complete hydraulic components.
Horizontal single-stage designations	Horizontal	Shinko	Pumps	Horizontal single-stage set on a bedplate with a flexible coupling to the motor. Bearings sit in a separate bracket and the set is back pull-out, so the rotating element, sleeve and bearings can be withdrawn with the casing and pipework left connected. Casing and cover gaskets are usually renewed at the same opening. Designations vary across the horizontal range, so the code cast or stamped on the machine is read from the pump rather than assumed from the duty.
KV designation	Vertical	Shinko	Pumps	Vertical arrangement with the shaft carried on bearings in the bracket above the casing. Where the design includes a priming arrangement, the priming chamber joints, the non-return valve and the air separator internals belong in the same request; whether they apply is read from the pump section drawing rather than assumed. Seal face condition, wear ring clearance and bearing bracket wear drive most of the requests raised against these pumps.
RVP designation	Vertical in-line	Shinko	Pumps	Motor mounted above the casing on a spacer bracket, suction and discharge on a common horizontal axis. Chosen where floor plate space is short. Wear parts move as a group: impeller, casing wear ring, mechanical seal, shaft sleeve and coupling rubbers.
DW Gas · DWG	DW Cargo Gas Pumps	Svanehøj	Pumps	Lineshaft-driven deepwell cargo pump that discharges through its own column, built for gas carriers from small fully pressurised ships to fully refrigerated VLGCs; the maker lists LPG, ammonia, ethane, ethylene, LNG and CO2 among the cargoes it handles without component changes. The maker's deck-level service schedule names the flexible coupling element, the bearing arrangement, the sealing liquid and the anti-rotation device; the double mechanical seal set comes in when the seal system shows a fault.
NMB Booster Pump	Booster pumps	Svanehøj	Pumps	Raises discharge pressure when a fully refrigerated carrier offloads lighter cargoes, and is also built as an in-line vertical unit. The maker describes its shaft bearings and seals as easy to reach and its drive as a heavy-duty flexible coupling to the electric motor, so seal items, bearings and the coupling element are the parts to name.
DW Fuel Pump	Fuel gas pumps	Svanehøj	Pumps	The DW gas pump downsized for fuel gas supply: a multistage centrifugal pump in cryogenic stainless steel with the motor outside the fuel tank, offered for LNG and also for LPG, ethane, methanol and ammonia. The maker states that the pump can be retracted even with gas in the tank, which is what its foot valve system is for; name those parts first, then seal and bearing items.
CS Fuel Pump · HPP Triplex Pump Unit · HP NH3 Booster Pump	Fuel gas pumps	Svanehøj	Pumps	The CS Fuel Pump is the maker's all-electric submerged design for LNG fuel, with a self-cleaning filter; the HPP Triplex Pump Unit is a high-pressure piston pump unit for LNG; the HP NH3 Booster Pump for ammonia, also presented as the HP NH3 Fuel Pump, is hermetically sealed and has no mechanical shaft seals. Name the unit exactly, since the three are built on different principles.
30 bar starting-air duty	Duty context	Sperre	Air compressors	Starting-air frames are normally rated around 30 bar to the receiver, with an interstage relief valve, a final safety valve and a non-return valve in the delivery line. Relief settings and the delivery-line arrangement belong in the enquiry.
HL2/77	Sperre HL family · air-cooled	Sperre	Air compressors	Compact air-cooled two-stage frame typical of smaller vessels, standby duty and topping-up service on a second receiver. There is no cooling-water jacket to drain here — the cylinders are finned castings. Short filling cycles make valve plates and piston ring sets the items most often replaced on this frame.
HL2/105 · HL2/120	Sperre HL family · air-cooled	Sperre	Air compressors	Mid-range HL2 frames. Requests can cover valve plate and spring sets, piston ring sets, gudgeon-pin bushes, and the gasket and O-ring set needed to close the unit after a top overhaul. State whether the frame is splash-lubricated or carries a crankshaft-driven oil pump.
HV1 / HV2 — vertical two-stage, water-cooled	Sperre HV family · water-cooled	Sperre	Air compressors	Vertical frames with a large-bore first stage and a small-bore second stage on one crankshaft, jacket-cooled and coupled to a foot-mounted motor. Wear concentrates in the valve plates and in the second-stage ring pack, which works against the highest differential pressure in the machine and takes any moisture carried over from the intercooler.
HV2/120 · HV2/140	Sperre HV2 series	Sperre	Air compressors	Mid-capacity twin-cylinder frames on general cargo, ferry and offshore tonnage. Enquiries usually cover suction and discharge valve assemblies for both stages, ring sets, and the intercooler nest between the stages.
HV2/210	Sperre HV2 series	Sperre	Air compressors	A larger water-cooled HV2 frame on starting-air duty, with the rated working pressure stamped on the crankcase plate rather than published here. HV2/210 requests can include first- and second-stage liners, complete valve assemblies, connecting-rod bearing shells and the crankshaft seal. Confirm the serial and rated pressure from the plate.
Moisture carryover into the second stage	Cooling and drains	Sperre	Air compressors	If the intercooler drain is neglected the separated condensate is carried forward with the charge; and if cooling water runs hotter than the design point, moisture stays as vapour past the separator and condenses in the second stage and the receiver. Water strips the oil film off the second-stage bore, accelerates ring and liner wear, scores the running surface and corrodes the valve seats. The same neglect leaves oil carryover and carbonised deposits in the delivery line, the recognised precursor to a starting-air line explosion. A unit that consumes rings twice as fast as its sister machine is usually telling you about drains, not about the rings.
Older HV1 and HL2 frames	Earlier builds	Sperre	Air compressors	Long-serving HV1 and HL2 units still run on coasters, fishing vessels and harbour craft. Valve and liner details changed across build years, so a part-book page or an earlier order line for the same serial carries more weight than the frame name.
Ring pack and bearing wear	Running gear	Sperre	Air compressors	Blow-by past the first-stage rings shows up as crankcase pressure and rising oil consumption before it shows up as lost capacity. Once the ring pack collapses, blow-by and skirt contact scuff the bore and the piston has to come out with the rings. Further down, big-end shells and gudgeon-pin bushes wear past their clearance limits, oil delivery to the running gear falls off, and the crankshaft seal begins to weep onto the tank top.
Unloader and safety valve faults	Control and protection	Sperre	Air compressors	A sticking unloader lets the machine start against full delivery pressure, which trips the motor overload and loads the bearings on every start. Safety and relief valves that have been lifting repeatedly rarely reseat cleanly afterwards. Both belong on the parts list whenever a top overhaul is planned rather than being left for a second enquiry.
Valve plate fatigue from short cycling	Valve gear	Sperre	Air compressors	The thin concentric plate flexes against its seat on every revolution. When a receiver non-return valve leaks back, or when air consumption keeps the machine cutting in and out, the plate accumulates cycles far faster than the running-hour counter suggests. The result is a fatigue crack, then a broken plate, then debris carried into the second stage. Symptoms are longer filling time and a hot delivery line. The interstage gauge tells you which stage: pressure below normal points to a first-stage valve, pressure above normal — up to the interstage relief lifting — points to a second-stage valve or a fouled intercooler.
Working and service-air frames	Duty context	Sperre	Air compressors	Lower-pressure service-air machines from the same families use a different unloader arrangement and pressure-switch setting. State the duty, because two frames with the same designation can carry different control components.
15 ppm bilge alarm and oil-content meter	Taiko separator line · monitoring	Taiko Kikai	Oily water separators	The measuring cell, its optics or sensing window, and the alarm unit are identified in their own right on board, usually with a separate plate and a separate type approval certificate from the separator itself.
Solenoid and three-way valve group	Taiko separator line · control group	Taiko Kikai	Oily water separators	Automatic oil discharge to the sludge tank, flushing-water admission where the arrangement includes it, and the overboard-or-recirculate decision run through this group. The automatic stopping device that returns flow to the bilge holding tank on a 15 ppm alarm sits here too. Coil voltage, port size and body material must be read from the fitted item, not inferred.
Taiko cooling circulation unit	Taiko pump line · jacket and central cooling	Taiko Kikai	Pumps	A jacket or central cooling unit runs continuously, so its request pattern is bearings, seal and coupling insert on a running-hours interval rather than hydraulic wear. Send running hours since the last seal change and say whether the weep shows at the seal or at the casing joint — that single observation decides whether the shaft sleeve goes into the request alongside the seal.
Taiko fire and combined bilge/fire unit	Taiko pump line · fire and emergency	Taiko Kikai	Pumps	On a Taiko fire or combined bilge/fire unit the number that decides the job is not rated head but the pressure held at the two most remote hydrants during the drill, because that is the figure the attending surveyor writes down. Ring clearance is what erodes it between drills. Send the drill pressure reading with the ring and impeller request and the scope usually settles in one exchange.
Taiko self-priming unit on bilge and drain duty	Taiko pump line · bilge and drain	Taiko Kikai	Pumps	Self-priming construction clears air from a dry suction line only as long as the priming chamber holds its liquid charge. So the request here is almost never the impeller: it is the priming-chamber internals, the non-return seat and the casing joint gasket — a Taiko unit on drain duty loses prime through a weeping joint long before it loses hydraulic performance. Send the suction lift the unit is asked to hold and the priming time recorded at the last test.
Taiko single-stage seawater centrifugal on ballast and GS duty	Taiko pump line · ballast and general service	Taiko Kikai	Pumps	The renewable ring pair is what an overhaul on this line consumes, not the impeller. Record the diametral ring clearance measured at the last opening and the shaft diameter at the seal from the Taiko sectional drawing — those two figures alongside the plate capacity in m³/h close a ring-and-impeller request with no part number at all.
US series 15 ppm bilge separator	Taiko separator line · US series	Taiko Kikai	Oily water separators	Coalescer-type 15 ppm bilge separator: gravity stage, coalescing stage, oil-collecting space, level sensing and an automatic oil drain to the sludge tank. Rated throughput is read from the plate, because element sizing and cartridge count follow it. The series designation on the fitted unit is taken from the plate photograph rather than from the spares list.
USH series 15 ppm bilge separator	Taiko separator line · USH series	Taiko Kikai	Oily water separators	The same 15 ppm bilge discharge task under a second Taiko series designation. What the suffix encodes is confirmed against the maker's own literature for the fitted unit rather than inferred here, and rated throughput is again read from the plate because element sizing and cartridge count follow it.
OG120C	OG series	TeamTec	Oily water separators	OG120C is the first size in TeamTec's OG range. Its burner, sludge dosage and combustion chamber items carry their own item numbers, so a part is never carried over from an OG200 or OG400 list on the strength of a similar name. The type and serial from the plate open the right list.
OG200C · OG200CS · OG200CW	OG series · versions	TeamTec	Oily water separators	The OG200 appears with several version suffixes, both in the maker's range and in parts listings elsewhere. The suffix belongs to the type and changes what is fitted on the unit, so each line is quoted against the full designation on the plate, never against the size number alone.
OG400C · OG400CS · OG400CW · OG400CSW	OG series · versions	TeamTec	Oily water separators	The OG400 shares its set of version suffixes with the OG200, so the same care applies to the letters. Its sludge dosage pump is a progressive cavity pump, and the stator, rotor, joints and pump seal are wear lines quoted against an OG400C next to burner and door items.
GS500C · GS500CS · GS500CSW	GS series · versions	TeamTec	Oily water separators	The GS500 is listed in more versions than any other GS model, so the suffix carries real weight here. Burner, sludge dosage, combustion chamber and flue gas fan items follow the same four assemblies as on the OG units, but with their own item numbers and sizes.
GS900CX	GS series	TeamTec	Oily water separators	GS900CX is the GS900 designation that the maker and independent parts listings spell the same way; other GS900 suffixes are written differently from one source to the next, so the plate decides. Sludge burner, dosage pump and refractory lines are read against the serial.
CNLB · CNLe	Centrifugal pump families	Iron Pump	Pumps	CNLB and CNLe are two of Iron Pump's centrifugal families, alongside BDV piston pumps, QT anti-heeling sets and the Ellehammer ejector range under the same maker. The pump itself is stamped IRON on the casing rather than the full Iron Pump name, a detail worth checking before a different maker is assumed.
Bilge ejectors	Water-driven · bilge duty	Körting	Pumps	Bilges and engine rooms come first among the spaces Körting names for its bilge ejectors. The ejector is driven by seawater from one of the ship's own pumps and has no motor or shaft of its own, so ejector parts and anything needed on the supplying pump are separate lines.
Ballast tank, cofferdam and forepeak ejectors	Water-driven · ballast duty	Körting	Pumps	Körting lists ballast tanks, cofferdams and the forepeak among the spaces its ejectors empty. An ejector reaches the residual water a centrifugal pump leaves behind, which is why one often sits on the stripping side of a ballast system and appears on the ballast piping diagram rather than in the engine-room drawings.
Chain locker and bow thruster ejectors	Water-driven · fore-ship spaces	Körting	Pumps	Chain lockers and bow thruster rooms are on Körting's list too. These ejectors sit far from the engine room, often in spaces that are hard to reach, and the photograph of the plate is usually the first thing missing from the enquiry, so ask for it before the ship leaves port.
Grey and black water ejectors	Water-driven · sewage duty	Körting	Pumps	Körting also names grey and black water among the media its ship ejectors handle. Here the suction side carries solids and fibre, so a blocked nozzle or mixing section is a more likely cause of lost suction than on a clean ballast line, and the medium belongs on the request.
CGA 50 · CGA 65	CG · vertical single-stage	Hamworthy	Pumps	The smaller CG frames of the vertical single-stage centrifugal family. Impeller, casing and cover wear rings, mechanical seal, shaft and sleeve, bearings and the casing gasket are the wear set; the figure after the letters is the connection size carried in the type code, not a capacity.
CGB 80 · CGB 100	CG · vertical single-stage	Hamworthy	Pumps	Mid-size CG frames on cooling, ballast and general service duty. Requests cover the impeller, the wear-ring pair, the mechanical seal assembly, drive-end and non-drive-end bearings and the shaft; state the execution suffix that follows the size, since it separates builds.
CGC 125 · CGC 150	CG · vertical single-stage	Hamworthy	Pumps	The larger CG frames, where a worn wear ring is felt as lost delivery before it is heard. Impeller, wear rings, seal assembly, bearing housings and the shaft sleeve are the recurring lines, and the pump serial rather than the size decides which drawing the parts come from.
CGD 200 · CGD 250 · CGE 300 · CGE 350	CG · vertical single-stage	Hamworthy	Pumps	The top of the CG range, met on main cooling and ballast duty. Impellers, wear rings, mechanical seals, bearings, shafts and sleeves are the usual scope; on these frames the coupling element and the driver identity are worth listing separately from the pump.
Eureka, Thune Eureka and Kværner Eureka on the same casing	Maker identity	Hamworthy	Pumps	CG pumps were sold under several plates as the business changed hands, and parts lists for the family are shared across those names. A CG casing with a Eureka or Thune plate is the same pump identity for RFQ purposes, so send the plate as it reads and the CG code beside it.
DL · DW · DWK/P · DWG · CKL · Dolphin	Deepwell and submerged cargo pumps	Hamworthy	Pumps	Here the code is a letter group and a cargo, not a size: DWK/P is the nitric acid and VCM variant, DWG carries an inducer for ammonia and gases, CKL is the oil-lubricated family for crude and refined cargoes and Dolphin is the centrifugal line. A DL is line-shaft driven, so the drive shaft column, slide bearings and the deck arrangement belong in the request beside the wet end.
2TM · 2TF	Starting air compressors	Hamworthy	Air compressors	Starting air compressors on Hamworthy enquiries appear as 2TM, with variants such as 2TM6, 2TM62, 2TM63, 2TM67 and 2TM68, and as 2TF with 2TF5 and 2TF54. These designations come from third-party parts listings rather than maker documentation, and the support lineage for these machines ran from Hamworthy KSE to Hatlapa to MacGregor, so the plate and the supporting house no longer carry the same name.
RV · RVA · RVD	RV series	Heishin	Pumps	The RV group is the Heishin code met most often on parts enquiries, RVA and RVD naming separate executions of it. Requests are written from the letters together with the size figure stamped after them, and cover the rotating set, the shaft seal, bearings and the casing gasket.
VSK · VDK · VK	VSK / VDK series	Heishin	Pumps	Three neighbouring letter codes that are easy to transpose, and a transposed code lands on a different pump. VDK sizes are written with a letter suffix after the figure, so copy the whole string; the wear scope is the rotating set, the seal, bearings and static gaskets.
CY	CY series	Heishin	Pumps	A short code with executions written as CY and CY-F-MN, and the suffix is part of the identity. Send the plate as it reads: on a two-letter code, a suffix dropped in transcription is the most common reason a quotation has to be reopened.
PV · PVN	PV series	Heishin	Pumps	PV and PVN sit next to each other in the programme and are not interchangeable. Requests cover the rotating element, the shaft seal arrangement, bearings and the gasket set, listed against the pump serial rather than the code alone.
NHL · NVL · NTH · NY · 2NL	Progressing-cavity ranges	Heishin	Pumps	The N codes are the progressing-cavity ranges, where a rotor turns inside an elastomer stator and the stator is the consumable. State the medium and the stator compound with the request, because on sludge, bilge and waste-oil duty the compound, not the pump size, sets the replacement interval; the drive shaft joints and the shaft seal belong on the same list.
VID · VIB	VID / VIB series	Shin Shin	Pumps	Two of the Shin Shin letter codes met on Korean-built tonnage. The code and the size figure stamped after it are what identify the pump, and the wear scope is the impeller, the wear-ring pair, the mechanical seal, the shaft with its sleeve and the bearings.
SVF 150 · SVS-100 · SVS-150	SVF / SVS series	Shin Shin	Pumps	The SV codes are written with and without a hyphen before the size, and both forms appear on parts lists for the same pump. Impeller, wear rings, mechanical seal, shaft sleeve and casing gasket are the recurring lines.
VF 125 · MLO 200A1	VF and MLO series	Shin Shin	Pumps	Two more codes from the same programme, MLO carrying a letter-and-figure suffix after the size. The suffix separates executions, so a request written from the first three characters narrows to a family rather than to a part.
EHS 50B · EHC 40A · SHC 40A	EHS / EHC / SHC series	Shin Shin	Pumps	Three codes that differ by one letter and are frequently mixed up in transcription. Send a photograph of the plate with the request where possible; the parts asked for are the impeller, the seal, bearings, shaft components and the gasket set.
Reading a Shin Shin code	Type designation	Shin Shin	Pumps	The code carries no capacity and no duty: it is a family letter group followed by a connection size and, on many executions, a suffix. That is why the pump serial and the system it serves are worth sending with it — the same code covers builds with different seal and material executions.
2VCS · VCS · 2VSR	Canned motor · VCS	Teikoku	Pumps	On these pumps the size figure is written in front of the code, as in 250-2VCS or 200 VCS, and the whole string is the identity. A canned motor pump has no shaft seal, so the items that wear are the plain bearings and thrust surfaces, the rotor and stator cans and the internal circulation parts.
300 VCD · 350 VCD-B2 · 450 VCD-A	Canned motor · VCD	Teikoku	Pumps	VCD units are met on central cooling fresh water duty, and the suffix after the code separates executions. Bearings, thrust washers, the liner, internal filters and the wear monitor components are the recurring lines; quote the suffix, because a VCD-A and a VCD-B2 are not the same build.
BF · TVC · VCB · TVD	Canned motor · BF / TVC / VCB / TVD	Teikoku	Pumps	Four neighbouring codes in the same programme, met with the size figure in front and an execution suffix behind. The internal parts follow the exact string rather than the family, so a code shortened by one letter routinely reaches the wrong bearing set.
CSM 50 · CSM 65 · CSM 80	Canned motor · CSM	Teikoku	Pumps	A compact family written with the size after the letters. Bearings, thrust plates, cans and the gasket set are the usual scope, and the motor and the pump are one sealed body, so a winding fault is quoted as a unit matter rather than as a component one.
40X25 MSS · 50 MSS-J · 100 MSS-BH1M · MS · MSN	Canned motor · MS / MSS	Teikoku	Pumps	The MS group is written in several forms, including a two-figure inlet and outlet pair in front of the letters. Copy the string exactly as it stands on the plate: the suffixes on this group are long, and they carry the execution the internal parts follow.
Atmos GIGA-I	In-line · single stage	Wilo	Pumps	Glanded in-line centrifugal pump with flanged suction and discharge on one centre line, a lantern, a coupling and an IEC standard motor. Wilo builds it for heating water, chilled water and water-glycol mixtures. The designation gives the connection size, impeller size, motor power and number of poles, and a suffix marks the variant: -L1 for a bronze impeller, -L4 for a stainless steel impeller, -P6 for back pull-out with a cartridge mechanical seal.
Atmos GIGA-N	End suction · back pull-out	Wilo	Pumps	Long-coupled end-suction standard pump on a baseplate, which Wilo describes as its entry-level model among glanded pumps. The rotor unit pulls out to the back, and the spacer coupling lets the mechanical seal be changed without moving the motor. Impellers are made in grey cast iron, bronze or stainless steel, so the material belongs on the request.
SCP	Axially split case	Wilo	Pumps	Horizontal split-case pump, single- or two-stage, with a volute casing split along the shaft axis and a double-suction impeller (Wilo's type key also lists single-suction versions). The suction and discharge branches are cast with the bottom half, so the top half lifts off while the pipework stays in place. The shaft runs in a mechanical seal or in stuffing box packing.
Helix FIRST V · Helix V	Vertical multistage	Wilo	Pumps	Vertical high-pressure multistage pumps with in-line connections and stainless steel impellers, stage housings and guide vanes. Helix FIRST V has a grey cast iron pump housing; on Helix V the pump housing is stainless steel as well. Both take either a plain mechanical seal or a cartridge seal, and the type string says which one is fitted.
SiBoost Smart (FC) Helix V	Pressure-boosting set	Wilo	Pumps	A factory-built water pressure set: two to four Helix V pumps in parallel on a galvanised frame with vibration absorbers, a diaphragm pressure vessel, a pressure sensor and gauge, shut-off and non-return valves for each pump and the Smart Controller SC. The FC version adds a frequency converter for the base-load pump. Set parts and pump parts are separate lines.
H-63	H-series	Tanabe	Air compressors	Two-stage water-cooled starting-air compressor in the H family. Valve assemblies, ring sets and intercooler tube stacks are the recurring line items on requests naming this machine.
H-64	H-series	Tanabe	Air compressors	H-family machine in a different size band from the H-63, so seat diameters and ring sections can differ between the two. Confirm the machine number stamped on the crankcase before rings or liners are ordered.
H-73	H-series	Tanabe	Air compressors	Larger H-family frame, seen where the main engine air receivers call for a higher charging rate. Requests commonly cover main and crankpin bearing shells, ring sets and delivery valve assemblies.
H-74	H-series	Tanabe	Air compressors	H-family machine in the larger size band. Aftercooler tube stacks, unloader components and lubricating oil pump parts appear alongside the standard valve and ring scope.
Nameplate missing	Unlabelled or repainted units	Tanabe	Air compressors	Where the plate has been painted over or replaced, the machine can still be narrowed down from crankcase casting marks, cylinder centre distance, flywheel diameter and photographs of the valve cages and cooler end covers.
D6-370	Volvo Penta D-Series	Volvo Penta	Engines	6-cylinder inline marine diesel. Pistons, cylinder liners, injectors, turbocharger components, heat exchanger elements, gasket sets.
D8-510	Volvo Penta D-Series	Volvo Penta	Engines	In-line six-cylinder commercial inboard — the 8 is the displacement class, not the cylinder count. Cylinder heads, valve assemblies, fuel injection pumps, crankshaft bearings, intercooler components, overhaul kits.
D11-670	Volvo Penta D-Series	Volvo Penta	Engines	11-litre 6-cylinder heavy-duty marine diesel. Piston ring sets, liner kits, exhaust valve seats, injection nozzles, cooling water pump assemblies.
D13-800	Volvo Penta D-Series	Volvo Penta	Engines	D13-800 RFQs can include cylinder head gaskets, connecting-rod bearings, fuel-pump plungers, turbocharger cartridges and lube-oil-system parts. Confirm build evidence.
D13-1000	Volvo Penta D-Series	Volvo Penta	Engines	Top-output D13 configuration. High-performance piston crowns, exhaust valve assemblies, injection equipment, camshaft drive components, complete overhaul kits.
TAD series	Volvo Penta TAD Series	Volvo Penta	Engines	TAD1640, TAD1641, TAD1642, TAD1643 and related RFQs can include engine, fuel, cooling and overhaul components. Confirm the complete model suffix, serial/build and installed application.
TWD series	Volvo Penta TWD Series	Volvo Penta	Engines	Heavy-duty turbocharged and aftercooled industrial diesel — TWD1240, TWD1643 and variants. Cylinder liners, piston assemblies, heads, injection parts, cooling systems.
RATO S · RATO S+	RATO · highly flexible	VULKAN	Engines	Highly flexible couplings on ship propulsion engines. Torque passes through elastic elements that wear in service, and the coupling is built of several segments, so an element change can be handled one segment at a time. RATO S+ is a further member of the same family; read the plus sign from the plate, as the element sets are not assumed to match.
RATO R · RATO R+	RATO · high-speed drives	VULKAN	Engines	The RATO line for high-speed main and power take-off drives, with a diesel engine or an electric motor on the driving side. Element sets and bolting are read against the coupling type and size; the plate tells R from R+, and the drawing shows how the coupling is arranged between the machines.
VULASTIK L	VULASTIK	VULKAN	Engines	A VULKAN coupling met behind marine engines, built for bell-housing and freestanding installation. Its elements are made in natural rubber and in silicone, so two elements of the same size need not be the same part: the compound and any marking on the element or the drawing go on the request line.
VULKARDAN E · F · G	VULKARDAN	VULKAN	Engines	Highly flexible couplings whose plates read VULKARDAN with a letter. VULKARDAN G was developed for generators and Z-drives, and its elastomer can be changed without moving the connected machines. Rubber elements and the bolting that holds them are the usual lines; the letter on the plate selects the element design.
Natural rubber · silicone	Element compound	VULKAN	Engines	VULKAN elements are made in natural rubber and in silicone, and one is never swapped for the other on a request. The compound and any hardness marking on the old element are part of the part reference, not a detail to settle after the quote.
Sulzer RTA Series	Sulzer Two-stroke	Wärtsilä	Engines	Legacy slow-speed main engines — RTA48T, RTA52U, RTA58T, RTA72U. Cylinder liners, piston rings, fuel pumps, exhaust valves, crosshead parts.
Wärtsilä 20	Wärtsilä Medium-speed	Wärtsilä	Engines	Compact in-line auxiliary engine. Cylinder heads, piston rings, injection nozzles, camshaft bearings, turbocharger cartridges.
Wärtsilä 26	Wärtsilä Medium-speed	Wärtsilä	Engines	Auxiliary and propulsion diesel. Cylinder liners, exhaust valve assemblies, fuel pumps, crankshaft bearing shells, gasket sets.
Wärtsilä W32 · Vasa 32 · 32DF	Wärtsilä Medium-speed	Wärtsilä	Engines	The family began as the Vasa 32 in 1977, so one number can mean an early-1980s machine, a low-NOx build from the mid-1990s or a current-generation engine; the name on the plate and the year of build travel with every line. Cylinder head unit sets, liners and liner O-ring sets, piston crowns, skirts and ring sets per unit, injection pumps and plunger assemblies, turbocharger cartridges and nozzle rings, and on the 32DF gas admission valves and pilot injectors.
Wärtsilä 34DF	Wärtsilä Dual-fuel	Wärtsilä	Engines	Dual-fuel medium-speed engine. Standard mechanical parts — pistons, liners, cylinder heads, injection pumps — sourced on request.
Wärtsilä 46 · 46F · 46TS	Wärtsilä Medium-speed	Wärtsilä	Engines	Three machines carry this number: the original of 1987, the F generation and the TS platform. The injection equipment, turbocharging and fuels changed from one to the next, so the generation letters stay on the designation. Liners with O-rings and anti-polishing rings, piston crowns and ring sets per unit, big-end and main bearing shells, valve cages, injection pumps or common-rail components according to the build, turbocharger cartridges and charge air cooler elements.
Wärtsilä 50DF	Wärtsilä Dual-fuel	Wärtsilä	Engines	Large-bore dual-fuel main engine. Cylinder kits, fuel injection components, exhaust system parts, cooling circuit spares.
ZA40S	Sulzer / Wärtsilä	Wärtsilä	Engines	Medium-speed auxiliary and propulsion engine. Cylinder heads, fuel injection pumps, valve timing components, turbocharger parts, gasket sets.
723 Plus Digital Control	Reciprocating engine control · 723 Plus	Woodward	Control, governors and switchgear	Digital control for gas, diesel and dual-fuel reciprocating engines, used with its own compatible actuator. Control cards for these systems are requested separately from the control itself.
2301A and 2301D Load Sharing and Speed Controls	Digital speed & load control · 2301	Woodward	Control, governors and switchgear	Load Sharing and Speed Control systems, typically paired with an actuator such as an EGB or a UG-Actuator. The control and the actuator are separate items commercially, but they identify each other technically.
3161 Governor	Mechanical-hydraulic · legacy	Woodward	Control, governors and switchgear	The legacy 3161 governor, carried alongside the UG range in isochronous or droop configuration. Like the UG series it is still catalogued individually by marine parts brokers, so a nameplate photograph is often enough to begin identification.
easYgen 2000, 3000 and 3200XT controllers	Genset paralleling · easYgen	Woodward	Control, governors and switchgear	Paralleling and load-sharing controllers for genset switchboards. On these units the switchboard arrangement is part of the request, since the controller is identified by what it parallels as much as by its own type.
EG-3P and EG-3PC proportional actuators	Electronic actuators · EG series	Woodward	Control, governors and switchgear	Proportional actuators driven from an electronic speed control. They are frequently the retrofit half of an installation whose governor body is decades older, so the actuator and the control it answers to are worth naming together.
EGB actuators and the UG-Actuator retrofit unit	Electronic actuators · EGB and UG-Actuator	Woodward	Control, governors and switchgear	EGB actuators, and the UG-Actuator retrofit unit with its own self-contained oil sump. Both appear as the driven element under a 2301A or 2301D control, and both are also requested as standalone spares.
PGA-EG and PGG-EG governor bodies	Marine governor bodies · PGA-EG, PGG-EG	Woodward	Control, governors and switchgear	Hydro-mechanical governor bodies with electronic control and pneumatic backup tracking, rated for a range of marine engine sizes. The backup arrangement is part of the identity of the unit and should be stated on the enquiry.
ProAct Digital and Digital Plus, and LECM modules	Large-engine control · ProAct, LECM	Woodward	Control, governors and switchgear	ProAct Digital and Digital Plus controllers for governing, sequencing and protection on large reciprocating engines in marine propulsion, and LECM engine control modules with validated gas, diesel and dual-fuel application software.
UG-8, UG-10, UG-15 and UG-25 Universal Governors	Mechanical-hydraulic · UG series	Woodward	Control, governors and switchgear	Universal Governor units in isochronous or droop configuration, still catalogued individually as ship spares. They sit on older diesel drives and on steam-turbine drives, which is why the driven machine matters as much as the governor designation itself.
TemPower 2 AR	Air circuit breaker	Terasaki	Control, governors and switchgear	TemPower 2 AR covers Terasaki's air circuit breaker range for switchboard duty. The moulded-case TemBreak family is a separate line from the same maker, and the AGR overcurrent relay carries its own designation and is ordered separately from the breaker, so state which family the breaker belongs to before a trip unit or contact set is quoted.
KFB series	Spring-applied electromechanical brakes	Pintsch Bamag	Deck equipment	The KFB brakes are spring-applied and electromechanically released, fitted as safety brakes on deck machinery drives. Linings or brake shoes, the release unit, springs, pins and bushes are the items, and the brake is quoted from its own type plate rather than from the winch it sits on.
SFB series	Spring-applied electromechanical brakes	Pintsch Bamag	Deck equipment	The SFB brakes are the series long used on winch motors in shipbuilding and as service or holding brakes on crane installations, and the series includes a seawater-resistant execution. State whether the marine execution is fitted, since the corrosion protection changes the parts.
Pintsch Bamag or Pintsch Bubenzer on the plate	Maker identity	Pintsch Bamag	Deck equipment	Buyers reach for the Pintsch Bamag name, while the brake and its linings are usually plated Pintsch Bubenzer after the two brake houses merged, so both names belong on the request. Send the type plate, the disc or drum arrangement and whether the release unit or only the linings are needed.
SC 30T	Tank cleaning machine	Scanjet	Deck equipment	A Scanjet tank cleaning machine type. Give the type exactly as marked and photograph every serial on the machine; a nozzle, gear or seal for an SC 30T is matched to those, together with the nozzle size if it is known. Without a serial the line stays open until one is found.
SC 90T2	Tank cleaning machine	Scanjet	Deck equipment	A separate Scanjet type. Copy the full designation, digits and letters, because an SC 90T2 and an SC 30T are different machines and no nozzle, gear or seal passes from one to the other by assumption. Send the serials and the nozzle size if known.
Nozzle housing · gear	Spare items	Scanjet	Deck equipment	Nozzle housings, often supplied with their gear and pin, and loose gears are the items that come up for these machines. Each is matched by machine type, serial and nozzle size. Seals go on the same request from the parts list for the type and are checked against the liquid the machine washes with.
Scanjet · Alfa Laval	Maker identity	Scanjet	Deck equipment	Machines and their manuals carry the Scanjet name. Alfa Laval acquired the company in 2022, so newer paperwork may show either name. With the machine type, either is enough to start a request.
RC 400	Radio remote control systems	Scanreco	Deck equipment	The RC 400 systems are met on hydraulically driven cranes and deck machinery, and a replacement is paired to the receiver already fitted rather than simply ordered by model. Transmitter housings, joysticks and levers, membranes, battery packs and chargers, and the receiver cards are the recurring lines.
G2 · G2B receivers	Receivers	Scanreco	Deck equipment	The G2 receivers are supplied with proportional and digital outputs and with a CAN interface, and several can be linked in a master and slave arrangement. State the output type and the valve it drives, because a receiver ordered on the model name alone can arrive with the wrong interface.
Mini transmitters	Transmitters	Scanreco	Deck equipment	The Mini transmitters are modular, supplied with linear levers or with joysticks and additional buttons and switches, so two units with the same name can have different controls. Photograph the front panel and send it with the request; the function count is what identifies the unit.
SRP RudderPropeller	Azimuth propulsion units	Schottel	Deck equipment	Fully steerable unit that makes a rudder superfluous; SRP-U and SRP-D variants. Propeller shaft seals, gearbox bearings, bevel gear sets and steering drive items.
SRP-R · SRP-RT	Retractable azimuth units	Schottel	Deck equipment	Retractable RudderPropeller; the RT variant works as a transverse thruster when retracted. Seal, gearbox and steering items per serial.
SRP 1515	Older SRP designation	Schottel	Deck equipment	Schottel's own pages give the SRP 460 as the type formerly called SRP 1515. Send the designation as stamped with the serial; both names belong on one request.
SRE EcoPeller	Electric azimuth units	Schottel	Deck equipment	Azimuth unit developed for an electric drive, LE-Drive available. LeaCon seal items, gearbox bearings and steering drive parts.
STP TwinPropeller	Twin-propeller azimuth units	Schottel	Deck equipment	Two co-rotating propellers on one underwater unit. LeaCon seal items, DuroVario clutch parts, gearbox bearings.
STT TransverseThruster	Tunnel thrusters	Schottel	Deck equipment	Fixed pitch across the range, controllable pitch on part of it. Shaft seals, gearbox bearings, CP hub seals and hydraulic items.
SPJ PumpJet	Flush-mounted pump-jets	Schottel	Deck equipment	Installed flush with the hull behind an inlet grid. Seal sets, gearbox items and inlet grid parts.
SCP ControllablePropeller	Controllable pitch propellers	Schottel	Deck equipment	Shaft-line CP propeller, full-feathering optional. Hub seals, pitch mechanism and hydraulic items, stern tube seals.
SRT RimThruster	Rim-driven thrusters	Schottel	Deck equipment	Electric thruster with no gearbox or shaft, water-lubricated bearings. Stator, rotor and bearing items; no gear-oil lines.
Tenfjord rotary vane	Spherical rotor steering gear	Tenfjord	Deck equipment	The rotary vane actuator on a spherical rotor is Tenfjord's core design, built the same way across four generations of the lineage. A nameplate reading Rolls-Royce or Ulstein Tenfjord instead of Tenfjord is the same machine under a later ownership name. Actuator seals, bearing pads, distribution valves and feedback units are the recurring lines.
TOKIMEC on the plate	Maker identity	Tokyo Keiki	Deck equipment	Founded in Tokyo in 1896 as a pressure gauge works, the company began building gyrocompasses in 1918 and hydraulic equipment in 1954, and its own history records Japan's first marine autopilot in 1926. It traded as TOKIMEC from 1990 and restored the Tokyo Keiki name in 2008, so a plate reading TOKIMEC is the same maker. Send the type code as stamped; it reads the same way under either name.
SS · SL · TS · TL · SP types	Electro-hydraulic steering gear	Tokyo Keiki	Deck equipment	The current type list: SS is the standard form, SL carries an independent auxiliary steering hand pump, TS has the auxiliary steering built into the steering stand, TL has both, and SP is a main steering gear in two systems. A leading W, F or H marks a wider hard-over rudder angle and an M after the type letters a higher rudder speed, so HSLM and SL are one family in two executions. Requests concern solenoid valves and coils, pump and hand pump seals, and hose sets.
S/T · UN/TN/UP · MP/MU/MT · HMT/HMU	Earlier hydraulic steering gear	Tokyo Keiki	Deck equipment	The maker's list of discontinued marine products files its earlier steering gear under the autopilot each was supplied with: UN, TN and UP types for the PR-1000 Series, MP, MU and MT for the PR-1500, HMT and HMU for the PR-1600, and the S and T types, together with SS, TS, SL, TL and SP types without a closing S or R, for the PR-2000. All are shown as no longer maintained, and for the PR-2000 types the list names the current types for the PR-3000 Series as the successor.
RV · RM · RE · FM · FE types	Steering gear	Kawasaki	Deck equipment	Kawasaki's current steering gear lineup, descended from the Hele-Shaw type of 1925 through the BV and LV types to a 2024 Unified-Edition E-series that builds the control box and rudder angle indicator into the actuator. Actuator and pump assembly components, seals and control box internals are the recurring lines.
CH Series	Controllable pitch propellers	Kawasaki	Deck equipment	Kawasaki has built controllable pitch propellers under licence from Escher Wyss since 1956; the current line is the CH Series. The pitch mechanism is worked by a hydraulic unit built into the propeller assembly, with a gearbox-mounted oil distribution box offered on some installations.
Compact Seal CX · DX	Oil-lubricated stern tube seal	KEMEL	Deck equipment	Kobelco's lip-ring seal for oil-lubricated stern tubes, built in CX and DX types and fitted as an aft seal against the sea and a forward seal against the engine room. Several seal rings sit in line inside the seal casing and run on a chrome steel liner. Seal rings, liner, casing O-rings and gaskets are the recurring docking lines, and the type letters on the plate decide which ring set applies.
Air Seal AX	Oil-lubricated · air type	KEMEL	Deck equipment	The air-type aft seal of the same oil-lubricated range, run with an air supply from the ship. Rings, liner and the air control items are quoted together, and the plate or the seal drawing shows whether an AX seal or a Compact Seal is fitted at the stern.
Side-rolling hatch cover	Panel, cleat and hydraulic set	MacGregor	Deck equipment	A side-rolling hatch cover is one system built from three parts — panels, the rolling and cleating hardware, and the hydraulic drive — and the cargo carried, not the cover itself, decides which wears first. The plate may name a builder other than MacGregor outright; that does not stop the enquiry, since these covers are supplied and serviced under several yard-fitted names.
Fixed pitch propellers · keyless · high skew	Fixed pitch propellers	Nakashima Propeller	Deck equipment	Main propellers made as a single piece for the ship they were designed for, from tankers and container ships to passenger tonnage. Nakashima developed keyless propellers in 1971 and its high skewed propeller in 1981; current designs add tip rake and the minimum blade area NHV (Non-Hub Vortex) propeller. Requests cover a replacement propeller to the original drawing, repairs of bent or eroded blades, the propeller nut and the boss cap.
MODEL XL	Controllable Pitch Propeller	Nakashima Propeller	Deck equipment	The CPP model for large vessels. The hydraulic cylinder sits inside the outboard propeller hub and moves the blades directly, and proportional control valves allow fine pitch corrections such as Automatic Load Control. The hydraulics are doubled: normal and emergency control valves, and separate pumps for main and auxiliary pitch control oil. A request should say which circuit an item belongs to.
MODEL XS	Controllable Pitch Propeller	Nakashima Propeller	Deck equipment	The CPP model for medium and small vessels. The pitch cylinder sits in the inboard intermediate shaft; oil from the hydraulic unit passes a solenoid valve into the OD box, then a pilot check valve, and the piston turns the blades through the pitch rod and crosshead. The hub interior is lubricated with grease instead of oil, which is worth stating on any hub seal request.
MODEL NT-F · TFN types	Tunnel Thrusters	Nakashima Propeller	Deck equipment	Fixed pitch tunnel thrusters designated NT-F005 up to NT-F130, with the TFN-15S to TFN-75S types listed in the same range. Nakashima has built tunnel thrusters since 1976. The unit can be withdrawn from the hull for overhaul ashore, and its propeller shaft seal is the same type the maker fits as a main propulsion stern tube seal.
MODEL NT-C · TC-70N	Tunnel Thrusters	Nakashima Propeller	Deck equipment	Controllable pitch tunnel thrusters from NT-C010 to NT-C130, plus the TC-70N type. A high-performance filter in the gravity oil tank keeps the oil clean, and the remote-control unit at the bridge console has a touch-panel display. Nakashima also offers low-noise blades for ships such as research vessels and special shaft seals for ships with large draught changes; state either on the enquiry.
ECO-Cap · JET-CAP · Monster Package	Boss caps and stern devices	Nakashima Propeller	Deck equipment	Propeller boss caps that break up the hub vortex. ECO-Cap carries thin FRP blades on a copper alloy cap body; JET-CAP carries GFRP fins bolted to a bronze boss cap screwed onto the shaft nut, and a damaged fin can be replaced on its own. The Monster Package combines further flow-improving devices, among them the Ultimate Rudder Bulb and the Neighbor Duct, whose geometry Nakashima works on with Becker Marine Systems, a group company since 2021.
Shaft Horsepower Meter · NASCA	Shaft monitoring	Nakashima Propeller	Deck equipment	The Shaft Horsepower Meter, developed by group company Shoyo Engineering, uses a detection ring on the intermediate shaft, an electromagnetic induction unit and a processing and display unit; a shaft thrust load meter can be added. NASCA (Nakashima Ship Cruise Assist System) builds speed, shaft power and fuel consumption monitoring on top of it. Name the unit, not just the system.
Provision crane	Ship stores and spares	OPCO	Deck equipment	OPCO's provision cranes lift ship stores and machinery spares aboard. A provision crane works in short, frequent lifts at the side of the ship, so slewing, hoisting and limit items wear together. Send the crane plate, the SWL plate as it reads and the parts-list page with the item numbers.
Hose handling crane	Tanker cargo hoses	OPCO	Deck equipment	On tankers the hose handling crane lifts the cargo hoses to and from the manifold. Hook, rope and brake items on such a crane are load-bearing and follow the crane's certificate; hydraulic items are read against the power unit that drives the crane.
Deck crane	Cargo and general lifting	OPCO	Deck equipment	OPCO also builds deck cranes for cargo work. A deck crane is quoted from its own plate and parts list; nothing is carried over from a provision crane list on the strength of a similar part name.
Oriental Precision & Engineering or OPCO on the documents	Maker identity	OPCO	Deck equipment	Both names belong to the same Busan company, and the documents of one crane may use either. Send them exactly as written; the crane type, the serial number and the item numbers decide the part, not the form of the name.
6AYL-ET	Yanmar AYL Series	Yanmar	Engines	6AYL-ET RFQs can include cylinder heads, valve assemblies, injection pumps, heat-exchanger elements and mounting seals. Confirm the installed governor and build evidence.
6AYL-HT	Yanmar AYL Series	Yanmar	Engines	6AYL-HT RFQs can include piston rings, liner O-rings, crankshaft bearings, connecting-rod fasteners and lube-oil-system components. Confirm installed configuration.
6EY18	Yanmar EY Series	Yanmar	Engines	6EY18, 6EY18AL or 6EY18ALW — an in-line six-cylinder four-stroke trunk-piston diesel with direct fuel injection. Give the engine designation in full, including the build suffix.
6EY22	Yanmar EY Series	Yanmar	Engines	6EY22 RFQs can include pistons, exhaust valves, fuel pumps, turbocharger components, governor and speed-control parts. Confirm serial/build and part evidence.
6HAL-DT	Yanmar HAL Series	Yanmar	Engines	Direct turbocharged HAL auxiliary. Compact high-speed configuration. Piston ring sets, liner kits, injector nozzles, gasket sets, water pump assemblies.
6MAL-HT	Yanmar MAL Series	Yanmar	Engines	6MAL-HT RFQs can include cylinder head assemblies, valve seat inserts, injection equipment, turbocharger interface parts and overhaul kits. Confirm serial/build evidence.
6N18	Yanmar N Series	Yanmar	Engines	6N18 RFQs can include cylinder liners, piston crowns, exhaust valve seats, fuel injectors, intercooler elements and overhaul kits. Confirm serial/build evidence.
6N21	Yanmar N Series	Yanmar	Engines	6N21 RFQs can include cylinder heads, main bearings, camshaft-drive parts, fuel injection pumps and turbocharger cartridges. Confirm serial/build evidence.
ZF W17200 · ZF W340	ToughGear series	ZF	Engines	ZF presents ToughGear as cast-iron transmissions for continuous duty on tugs, ferries, offshore support vessels, fishing vessels and other workboats, with PTO, PTI and PTH options, AutoTroll for manoeuvring and positioning, and rotation concepts listed as CEW and CCEW. ZF's lubricant list covers W-prefixed units from ZF W220 upwards with variant letters C, NR, NC, DS and NR2H. Clutch plate sets, seals, bearings, filters and cooler elements are matched to the serial.
ZF 2050 · ZF 60000 NR2H	Numbered commercial gearboxes	ZF	Engines	ZF gearboxes without the W prefix; ZF's own list of commercial installations includes the ZF 2050 and the ZF 60000 NR2H. ZF's lubricant list groups the types from ZF 220 to ZF 83700 with suffix variants such as A, V, IV, C, U, D, NC, NR, NR2H and TS, and its hybrid range uses the A suffix for a down-angle unit. ZF data sheets rate a gearbox separately for each duty class, so the duty of the installation and the parts list number on the plate decide clutch, bearing and seal items, not the type number alone.
ZF 3300 PTI · ZF 8300 PTI · ZF 3000 NRD PTI	Hybrid transmissions	ZF	Engines	Gearboxes with a power take-in for an electric motor, listed by ZF for FPP, CPP and waterjet propulsion, in cast iron or light alloy housings, in parallel, A and V configurations and with DR and DL reversing layouts. ZF also supplies complete systems with flexible couplings, electric pumps, inverters and control units. The PTI and its clutch are quoted as separate lines.
ZF 400 IV · ZF 4 to ZF 115	Small-medium transmission range	ZF	Engines	ZF builds its small-medium range, shown with the ZF 400 IV, in a sea-water resistant aluminium alloy housing for pleasure craft as well as commercial duty cycles. Within it, the mechanically operated M-series is also used in lifeboats, the TS series is a two-speed design, and higher-rated models carry ZF's SuperShift2 clutch control. ZF's lubricant list groups the smallest numbered types, ZF 4 to ZF 115, with variant letters including M, A, IV and TS. Because ZF names lifeboats among the uses, such a gearbox can be found aboard a merchant ship as well as on small craft.
BW · HBW · HSW · IRM	Other designations in ZF's list	ZF	Engines	Plates reading BW, HBW, HSW or IRM instead of a ZF-prefixed type are covered by ZF's current lubricant list alongside its own ranges. They are identified the same way — type, serial number and, where stamped, the parts list number — and items are matched to that serial rather than to a newer model.
H21/32 · H25/33 · H32/40	HiMSEN four-stroke	HiMSEN	Engines	HiMSEN covers Hyundai's four-stroke auxiliary and propulsion range from H17/28 up to the H46/60V and H54DF frames. The V-form H32/40V is a separate build from the in-line H32/40 sharing the bore, and cylinder-head or liner parts are not interchangeable between them on that basis alone.
4045AFM85 · 4045TFM85	PowerTech 4045	John Deere	Engines	The four-cylinder marine engines. The 4045AFM85 is a propulsion engine introduced to take over from the earlier six-cylinder 6068TFM75 and 6068TFM76, and the 4045TFM85 is the generator-drive build. Filters, the sea water pump impeller, anodes and gasket sets are quoted against the full code and serial.
6068AFM85 · 6068SFM85	PowerTech 6068	John Deere	Engines	Six-cylinder marine engines with a high-pressure common-rail fuel system, offered for propulsion and, under the same code, as constant-speed auxiliary and generator engines. The use on board goes into the enquiry, since the two builds are set up differently.
6090AFM85 · 6090SFM85 · 6090HFM85	PowerTech 6090	John Deere	Engines	The middle six-cylinder family for propulsion and generator drive. The HFM85 build is the radiator-cooled engine for generating sets and auxiliary duty, so cooling items for it differ from those of a keel- or heat-exchanger-cooled propulsion engine.
6135AFM85 · 6135SFM85 · 6135HFM85	PowerTech 6135	John Deere	Engines	The largest PowerTech marine family, for propulsion and generator drive, with a radiator-cooled HFM85 build for generating sets. Injectors, cooler elements, turbocharger gaskets and filter sets are quoted against the complete code and serial.
6068TFM75 · 6068TFM76 · 6081AFM75	Earlier marine codes	John Deere	Engines	Engines from before the 85-coded generation, still at work on many vessels. TFM75 marked a propulsion build and TFM76 a generator-drive build of the 6068. Parts are matched to the old code and serial, and items revised since the build are named in the reply.
LH · LH-L · LA	Low-speed four-stroke main engines	Hanshin	Engines	Hanshin's low-speed four-stroke families power Japanese-built coastal tonnage, and an older vessel's plate may read LU or EL instead of the current family letters — the same maker under an earlier naming.
ME-C · ME-GI · ME-GIE · ME-GA · ME-LGIM · ME-LGIP	HD Hyundai Heavy Industries · Everllence licence	HD Hyundai / Doosan	Engines	MAN B&W two-strokes built by HD Hyundai Heavy Industries. Exhaust valve parts, cylinder covers, liners, piston ring sets, HCU and control valve items, gas and pilot fuel valve items. Give the builder's works number.
X92 · X-DF · RT-flex82C · RT-flex DF	HD Hyundai Heavy Industries · WinGD licence	HD Hyundai / Doosan	Engines	WinGD two-strokes built by the same Hyundai works. Exhaust valve parts, liners, piston ring sets, common-rail injection items, gas admission and pilot fuel items on X-DF. Read the type, not the builder.
ME-C · ME-B · MC · ME-LGIP · ME-GA	HD Hyundai Marine Engine · formerly STX Heavy Industries	HD Hyundai / Doosan	Engines	MAN B&W two-strokes built in Changwon. Exhaust valves, fuel valves, fuel pump parts, pistons, stuffing box rings, bearing shells, pipes and cylinder covers. Older documents may read STX.
ME-GI	Hanwha Engine · formerly HSD Engine and Doosan Engine	HD Hyundai / Doosan	Engines	MAN B&W two-strokes from the former Doosan works. Gas injection and pilot fuel valve items, exhaust valve parts, liners and piston ring sets. Plates may read Doosan, HSD or Hanwha.
Type A · AX · AT · K · E	Four-stroke, plus licence-built UEC two-stroke	Akasaka	Engines	Akasaka's own four-stroke types run alongside UEC two-strokes built under licence for Japanese coastal and fishing tonnage. Confirm which programme the plate belongs to, since the two draw from different parts catalogues under the same builder name.
VZO 20 · VZO 25 · VZO 40	CONTOIL VZO	Aquametro	Engines	Volumetric oil meters with a roller counter and an optional pulse output, in screwed and flanged builds. Counters, pulse transmitters, measuring chambers and strainers are quoted against the complete code on the label.
VZF II	CONTOIL VZF II	Aquametro	Engines	The second CONTOIL family for lubricating oils and fuels. The family is named in every line along with the full code from the label.
DFM 8ECO · DFM 12ECO	Differential measurement	Aquametro	Engines	Differential fuel measurement units with electronic readout, used where fuel returns from the engine. Sensors, the readout unit and the board computer that calculates consumption are quoted as separate lines.
M26.2 · M26.3	M26 series	Baudouin	Engines	A Baudouin commercial engine built in six, eight and twelve cylinders. The M26.3 is the later common-rail generation, so injection items for an M26.2 and an M26.3 are never assumed to match. Engines such as the 6M26.3 and the 12M26.3 serve as propulsion engines and generator engines, and the use goes into the enquiry.
6M33.2 · 6M33.3 · 12M33.2 · 16M33.3	M33 series	Baudouin	Engines	The larger commercial series, in generations .2 and .3 and in six, twelve and sixteen cylinders, used on tugs and pushboats among others. Cylinder heads, liners, pistons, bearings and injection parts are matched to the complete code and serial.
12M55	M55 series	Baudouin	Engines	The largest Baudouin commercial engine, built for sea-going tugs, deep-sea trawlers, dredgers and ferries. Enquiries are quoted line by line against the code, the serial and the parts catalogue the ship holds.
6F21	F series	Baudouin	Engines	The first engine of the F series, introduced after the M33. Filters, cooler elements and gasket sets are quoted against its code and serial like the larger engines.
DP · DNP	Older engines	Baudouin	Engines	Earlier Baudouin series still met on older fishing vessels. The type is copied from the plate exactly, and photographs of the plate, the engine and the removed part are the next evidence when a plate has worn.
B33:45L · B33:45V	B series, liquid fuel	Bergen	Engines	The current larger liquid-fuel engine, built in-line (L) and as a V engine. It succeeded the B32:40 as the main platform, so an enquiry states which of the two is on board. Cylinder heads, liners, pistons and rings, bearings and injection items are quoted against the full type and the serial.
B32:40	B series, liquid fuel	Bergen	Engines	The earlier liquid-fuel platform, in-line and V, used for propulsion and in generating sets. Many are still at work on ferries and offshore tonnage. The plate may carry a Bergen Diesel or Rolls-Royce name; cylinder heads, liners, pistons, bearings, nozzles and gasket kits are matched to the type and serial.
C25:33L	C series, liquid fuel	Bergen	Engines	The smaller in-line liquid-fuel engine, for propulsion and for generating sets, and able to run on heavy fuel oil. Pistons, fuel pump plungers, valves and gasket sets are quoted against the engine type, the serial and the duty, because a propulsion engine and a generating set are set up differently.
B36:45L · B36:45V	B series, gas	Bergen	Engines	The lean-burn gas twin of the B33:45. Its main structural parts are shared with the B33:45, but the gas admission, ignition and control items are its own, so the plate decides which list applies.
C26:33L · B35:40	Gas engines	Bergen	Engines	The gas twins of the C25:33 and the B32:40. Base engine items can resemble the diesel twin while gas valves, pre-chambers and ignition parts differ, so the gas type is named in every enquiry line.
K · K-G4 · BRM	Older engines	Bergen	Engines	Engines from before the B and C series: the K family and the K-G4 gas engine derived from it, and the BRM engines. Their plates often read Normo, BMV or Bergen Diesel. The full type with its letters and cylinder figure is copied exactly from the plate, and photographs of the plate and the removed part are the next evidence.
RT-flex	Two-stroke, electronically controlled	Sulzer	Engines	RT-flex replaced the mechanical RTA camshaft-driven running gear with a common-rail supply unit, rail unit and separate injection and exhaust valve control units — four assemblies with no RTA equivalent. An RTA part number does not cross over to an RT-flex engine on any of these.
ViscoSense 3 · ViscoSense 3D	Fuel viscosity · ViscoSense	VAF Instruments	Engines	In-line sensors that read fuel viscosity from a small pendulum vibrating in the fuel. The ViscoSense 3 reads viscosity and temperature; the 3D reads density as well. The sensor is wired to an interface box, and the viscosity controller uses the reading to trim the fuel heating. Sensor and box carry separate labels and part numbers, and a ViscoSense 3 box is not read as a 3D box. Older ViscoSense 2 installations are still met in service and are quoted from their own labels.
Viscotherm	Fuel viscosity · earlier VAF system	VAF Instruments	Engines	Viscotherm is the name of VAF's earlier fuel viscosity control equipment, in which a controller holds viscosity by regulating the fuel temperature. For Viscotherm installations VAF offers a retrofit: a housing of the same shape that takes a ViscoSense sensor. Whether a ship still runs the original unit or the retrofit is read from the labels and the housing, not from the name in the machinery list.
J5025PT2 · J5040PT2 · J5050PT2	Fuel flow meters · PT2	VAF Instruments	Engines	Positive displacement meters with sliding vanes, made for measuring fuel consumption on board. The full type is stamped on the meter body and is copied exactly, together with the serial; two meters on one fuel line are often of different types. The meter body and the pulse sensor that reports its count are separate lines on a request.
T-Sense	Shaft power meter · optical	VAF Instruments	Engines	An optical torque meter on the propeller or drive shaft that reports torque, shaft speed and shaft power. Some of its parts turn with the shaft and some sit beside it, and each carries its own label. The fault shown on the display and those labels decide which part goes on the request.
TT-Sense	Thrust and torque meter · optical	VAF Instruments	Engines	The same optical approach with propeller thrust measured as well as torque. A TT-Sense is quoted from its own labels and parts list, never from a T-Sense list, even though the two meters look alike on the shaft.
K, L and C series	Screw pumps	KRAL	Pumps	General-purpose K series, medium-pressure L series and the high-capacity C series (CK, CL, CG sub-types) cover fuel, lube oil, hydraulic and burner duty. State the sub-type letter on a C-series request, since housing material and screw set differ between CK, CL and CG.
OMP	Fuel flow meters	KRAL	Pumps	KRAL's own fuel-consumption flow meters, commonly fitted on the same line as a KRAL screw pump. The meter fails on its own schedule and is quoted as a separate item from the pump.
ILN, ILNS and ILNE	Centrifugal · vertical in-line	KSB	Pumps	Vertical in-line pump with a closed impeller and a mechanical seal, back pull-out. ILNS adds an auxiliary vacuum pump and ILNE an ejector, quoted as their own lines. Impeller, mechanical seal, shaft parts, bearings and casing joints.
Movitec	Multistage · vertical high-pressure	KSB	Pumps	Ring-section multistage pump, close-coupled, nozzles in line. Stage parts follow the complete designation on the plate rather than the family name; impellers, stage parts, shaft seal and O-rings.
Magnochem and Magnochem-Bloc	Seal-less · magnetic drive	KSB	Pumps	Seal-less volute casing pumps with a magnetic drive and no shaft seal. Requests centre on the containment shroud, the wetted-side bearings and the drive, quoted against the serial number and the shroud fitted.
L2 range (L2NG, L2NT)	Twin-screw pumps	Leistritz	Pumps	Single-volute twin-screw pumps with one shaft seal and spindles carried in bearing bushes; the L2NT is the semi-submerged cargo pump hung in a barrel. Spindle set, bearing bushes and the seal letter at the end of the type code.
L3 range (L3NG, L3NT, L3MF)	Three-spindle screw pumps	Leistritz	Pumps	Lube oil, fuel and hydraulic duty, including engine-mounted gear-driven main lube oil pumps without a shaft seal, submerged L3NT units and L3MF steering gear pumps. Give the engine maker for engine-mounted units.
L4 and L5 ranges	Double-volute and five-screw pumps	Leistritz	Pumps	The L4 is a timing-gear twin-screw pump with a replaceable insert and oil-lubricated bearings; the L5 is the five-screw cargo design. The range digit is not a spindle count.
FLEXCORE	Cartridge screw pumps	Leistritz	Pumps	The exchangeable pump cartridge is changed as one unit on fuel and lube oil service; confirm magnetic drive or mechanical seal before ordering.
NL Series	Current range · tool-light regasketing	Kelvion	Heat exchangers	A related current gasketed range using PosLoc plate alignment together with the EcoLoc gasket, aimed at a tool-light regasketing job. Plate and gasket references are series-specific and are not interchangeable with the NT range without confirming both plate corrugation and tightening dimension.
HT (high-temperature) duty	Jacket-water circuit	Kelvion	Heat exchangers	The plate exchanger cooling engine jacket water directly. It runs hotter and is typically smaller in plate count than the LT stage on the same vessel, with plate material and gasket compound chosen for the jacket-water treatment chemistry in use.
LT (low-temperature) duty	Central-cooling circuit	Kelvion	Heat exchangers	The intermediate fresh-water exchanger sitting between the HT circuit and the seawater circuit, often the largest plate pack in the central-cooling system because it serves multiple auxiliary coolers besides the jacket-water stage.
SW (seawater-cooled) duty	Seawater circuit	Kelvion	Heat exchangers	The final stage rejecting heat to seawater, where plate and gasket material selection carries the most weight — titanium or high-alloy stainless plates are common here specifically because of seawater corrosion risk, and a like-for-like material match matters more on this circuit than on the fresh-water stages.
Frame size & plate count	Duty context	Kelvion	Heat exchangers	Two frames in the same series can carry very different plate counts depending on the vessel's cooling load, so the frame's own plate count — not a generic figure for the series — decides how large a plate-pack or gasket-set order should be.
S7A · S9A · S14A · S20A	Gasketed plate heat exchangers	Sondex	Heat exchangers	Gasketed plate coolers in which the letter after the figure marks a build of the type; the type code from the frame is copied in full. Plates, gasket sets and tightening bolts are quoted against the type, the plate count and the drawing number.
SPS	Plate and shell	Sondex	Heat exchangers	Welded plate and shell heat exchangers, where the plate pack sits inside a shell. Shell gaskets and connection parts are quoted against the serial; a damaged plate pack is answered with the options the serial allows.

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765 entries in one table: 603 model designations, plus 162 duty and identification notes.

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