Industrial marine process instrumentation

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.

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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

All 282 designations we quote against, in one table.

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282 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.
TPL65 / TPL67	ABB TPL Series	ABB	Turbochargers	Compact radial 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.
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 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.
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 PureNOx scrubber wash 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 / S867	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.
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.
Single-helix rotor in a double-helix stator	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 is the reason it is chosen, and the reason wear is noticed late.
Standardised single-stage units	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 to about 700 m³/h. 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 dry running up to roughly 30 minutes. Reaches about 300 m³/h and 105 m and passes soft solids to 10 mm. 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 and reaches roughly 1500 m³/h, 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, DN25 to DN80, up to about 75 m³/h and 50 m, 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 up to about 500 m³/h and 10 bar, dropping into existing DIN 24255 pipework. Impeller, casing and cover wear rings, mechanical seal and shaft sleeve dominate the wear list.
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 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)	Caterpillar	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	38-litre 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	50-litre 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 19-litre with advanced fuel management. Cylinder heads, injector cups, valve seat inserts, camshaft followers, lube oil system components.
QSK38	Cummins QSK Quantum	Cummins	Engines	QSK 38-litre V12 Quantum high-power engine. Piston assemblies, exhaust valve rotators, fuel injectors, turbocharger nozzle rings, cooling system spares.
QSK60	Cummins QSK Quantum	Cummins	Engines	60-litre 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.
BRC hydraulic actuators	Actuators - BRC series	Damcos	Valves	BRC actuators sit on the valve itself and turn hydraulic pressure from the power unit into valve movement. This is the layer opened most often on board, and the layer where seal kits and rebuild kits are the usual first line on an enquiry.
BRCF HT high-torque execution	Actuators - BRCF HT	Damcos	Valves	Where a valve asks for more torque than the standard execution provides, the high-torque BRCF HT variant is the one fitted. Because HT is a distinct build, it is worth reading the marking rather than assuming the standard variant when the request is written.
BRCF hydraulic actuators	Actuators - BRCF series	Damcos	Valves	The BRCF range covers the same job in a different execution. Read the series marking off the actuator body before a kit is described, since the kit is matched to the actuator series rather than to the size of the valve underneath it.
Damcos control cabinets	Control cabinets	Damcos	Valves	The cabinet is where valve commands originate and where position feedback arrives. Cards and interface modules inside it are replaceable items, and a fault on this side can look identical, on the mimic panel, to a fault out at the valve.
LPU-S, LPU-D and LPU Plus local power units	Power units - LPU series	Damcos	Valves	The LPU series are the electro-hydraulic power units of a Damcos valve remote control system: the layer that generates hydraulic pressure and holds it available for the actuators it serves. State which execution is on board, because the pump, motor, solenoid and manifold parts inside follow the execution rather than the vessel type.
Valve remote control systems	Complete systems	Damcos	Valves	Power unit, actuators and cabinet together form the Valve Remote Control System. Documented duty covers ballast valves, cargo valves, hatch covers, steering gear and bilge systems on tankers, bulk carriers, LNG carriers and cruise ships.
AGC 150 standalone controller	Genset controllers · AGC 150	Deif	Control and governors	The standalone, non-synchronizing member of the AGC range, typically seen on an emergency generator. Because it does not parallel, its spare scope differs from an AGC-4 on the main switchboard even where the panel cut-out looks the same.
AGC-4 and AGC-4 Mk II	Genset controllers · AGC-4	Deif	Control and governors	Genset, mains, bus-tie, group and plant controllers on the main switchboard. One hardware family covers several controller roles, so the role a unit fills on board belongs in the request beside the type designation.
Delomatic-3 and Delomatic-4	Power management · Delomatic	Deif	Control and governors	Platform modules coordinating synchronizing, load sharing, load reduction and shedding, and covering shaft-generator or DP-interface duty. What is usually needed is an individual card out of the cubicle rather than a complete controller.
Multi-line 2 GPU and GPC	Generator protection · Multi-line 2	Deif	Control and governors	Multi-line 2 in its Generator Protection Unit (GPU) and Generator Paralleling Controller (GPC) variants, fitted as a module set for standalone generator protection or paralleling.
MVR-200, MDR-2, GPU-3, MTR-4 and APU-4	Protection relays · multi-function	Deif	Control and governors	Busbar, generator, motor, transformer and grid protection modules. Several of these often sit side by side in one switchboard, so a request naming only the vessel and the symptom rarely narrows to a single module.
PPM 300 genset controllers	Paralleling & protection · PPM 300	Deif	Control and governors	PPM 300 genset controllers, including the PPM 300 Emergency marine and offshore variant. These are the units met inside a PLC-based power management system rather than on a standalone panel.
PPU-3 and PPU 300 units	Paralleling & protection · PPU	Deif	Control and governors	Synchronizing and load-sharing units. On board they sit in the same paralleling and protection duty as PPM 300, which is why the designation read off the fascia decides the parts list rather than the function described over the phone.
RMC, RMP, RMQ, RMV and LMR-1xx	Protection relays · RM-series	Deif	Control and governors	Single-function current, power, loss-of-excitation, loss-of-mains, voltage and frequency relays, handled alongside genset controller and power-management requests rather than as a separate enquiry.
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 — these are 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.
Pac series - the instrument in a pocket	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 and the signal it sends	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 transmitters in the machinery spaces	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 - enclosed-space and tank entry	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.
Anti-Heeling Pumps	Stability system	Framo	Pumps	Submerged pumps able to run in both directions, so heel is corrected by reversing the pump rather than by a changeover valve arrangement. Enquiries usually mix pump wear parts with heel-sensor and control-system components.
Cofferdam Barrier and Drain Arrangement	Barrier system	Framo	Pumps	The dry barrier space between hydraulic oil and cargo, drained to a shut-off valve and collecting point at deck level. Cofferdam drain lines, drain valves and deck drain-point fittings, with the purging connection used to clear the line.
Hydraulic Motor Assemblies	Hydraulic drive	Framo	Pumps	The motor on top of each pump head. Piston and cylinder-block wear, valve plate scoring, shaft seal leakage and bearing play are the usual reasons a unit is landed for overhaul.
Hydraulic Power Packs	Hydraulic drive	Framo	Pumps	Engine-driven or electrically driven pack feeding a constant-pressure ring line through pressure-compensated main pumps that destroke on demand. Feed and main pump elements, pressure and return filter elements, relief valves, oil coolers and header-tank components.
SB Series Submerged Ballast Pumps	Ballast duty	Framo	Pumps	Hydraulically driven ballast pumps — SB125, SB200, SB300 — in segregated ballast tanks and on anti-heeling service. Seawater duty changes the corrosion picture: bearing wear, impeller erosion and shaft sleeve condition dominate the parts list, alongside seal kits and hydraulic motor service components.
SD Series Submerged Cargo Pumps	Submerged cargo	Framo	Pumps	Single-stage centrifugal cargo pumps hung in the tank on the discharge pipe, designated as series plus size — SD100, SD125, SD150, SD200, SD250, SD300. The series covers full cargo tanks down to slop and small parcel tanks. Impeller and wear ring, top and bottom bearings, cofferdam seal arrangements, hydraulic motor internals.
TK Series Portable Hydraulic Pumps	Portable equipment	Framo	Pumps	Hose-fed TK80, TK100 and TK150 units used for stripping, residue and washings removal, dewatering and emergency transfer, driven from the ship's hydraulic system or a portable power pack. Service kits, quick-couplings, hose sets, impeller and seal components are the recurring items.
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 that a buyer should expect 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.
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, a higher separating temperature or a lower throughput all point toward a smaller bore. 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.
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.
Power packs and control gear	Hydraulic systems	Hatlapa	Air compressors	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	Air compressors	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 element requests 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	Air compressors	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.
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. IHI's separate Diesel United business licence-builds large, slow-speed two-stroke MAN B&W and WinGD main engines — a different business, unrelated to the RH-series turbochargers on this page.
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-family marine turbochargers	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 — it is not interchangeable with the RH133-283 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 sits in the 200 to 330 bar band and the stage count rises accordingly. 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 the 30 to 40 bar of a starting-air machine. 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.
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 — it changes 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, covering roughly 500–3,000 kW per unit — the duty band the later ST generation went on to cover at 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 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 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, covering roughly 500–6,000 kW per unit on medium-speed auxiliary sets and main engines. Typical items are cartridges, shaft assemblies, plain bearings, sealing bushes, nozzle rings and filter silencer elements.
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	MAN Four-stroke	MAN / MAN B&W	Engines	Compact auxiliary diesel. Piston rings, cylinder liners, fuel injection pumps, intercooler elements, crankshaft 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	MAN / MAN B&W	Engines	Medium-speed auxiliary engines. Cylinder heads, connecting rod bearings, injection nozzles, turbocharger cartridges, gasket sets.
M20 · M25 · M32 · M43	MaK Medium-speed	MAN / MAN B&W	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.
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.
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.
BR 4000 C (Rolls-Royce era)	MTU BR 4000 C	MTU	Engines	BR 4000 C series covering Rolls-Royce Power Systems-era production. 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 obvious from 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 the seat variant is worth stating 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.
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	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, rigid coupling and its 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.
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 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 a damaged set 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.
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.
Multi-gas and VOC portables	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 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 kit, gasket set 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.
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 commonly rated for 30 bar starting air. 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 lose clearance, 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	Pumps	The measuring cell, its optics or sensing window, and the alarm unit form their own identity 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	Pumps	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	Pumps	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	Pumps	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.
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, 370 hp. Pistons, cylinder liners, injectors, turbocharger components, heat exchanger elements, gasket sets.
D8-510	Volvo Penta D-Series	Volvo Penta	Engines	8-cylinder commercial inboard, 510 hp. 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, 670 hp. 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, 1000 hp. 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.
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 34DF	Wärtsilä Dual-fuel	Wärtsilä	Engines	Dual-fuel medium-speed engine. Standard mechanical parts — pistons, liners, cylinder heads, injection pumps — sourced on request.
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 and governors	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 and governors	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 and governors	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 and governors	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 and governors	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 and governors	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 and governors	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 and governors	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 and governors	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.
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.
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.

This list indicates coverage. It is not stock on hand and not a claim of affiliation with any manufacturer. A model missing from the table does not mean we cannot source it.

Useful evidence

Send the maker together with the model, serial, equipment tag, part reference and quantity.

Equipment-level sourcing guides — pumps, separators, turbochargers, boilers, fuel injection and more — are collected in the marine spare parts guide index.

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All 282 designations we quote against, in one table.

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