NETZSCH Marine Pump
Spare Parts Supplier
NEMO progressing cavity pumps on engine-room sludge, bilge, oily water and sewage · NOTOS screw · TORNADO rotary lobe
NETZSCH pumps met in engine-room and deck enquiries
NETZSCH Pumpen & Systeme, headquartered in Waldkraiburg, Germany, with manufacturing sites on several continents, puts three working principles at the centre of its marine material. NEMO progressing cavity pumps take the awkward fluids — oil sludge, bilge water, oily water on its way to the separator, sewage and waste oil. NOTOS multi-screw pumps carry fuel and lube oil, and TORNADO rotary lobe pumps handle wastewater and transfer work where space is tight. Each principle has its own wear list, so the plate is read for the range before any part is named.
NEMO BY
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
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
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
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
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
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.
NETZSCH · NETZSCH-Mohnopumpen
NEMO production began in 1952. From 1962 the pumps came from NETZSCH-Mohnopumpen GmbH in Waldkraiburg, renamed NETZSCH Pumpen & Systeme GmbH in 2012, so older plates and manuals may carry the earlier name. The word Mohno does not settle the maker on its own: Heishin in Kobe sells its progressing cavity pumps as Mohno Pumps, and NETZSCH names Heishin as its cooperation partner in Japan.
Where a NEMO pump on sludge and bilge duty gives up
A progressing cavity pump seals by interference: the rotor presses into the elastomer along a continuous line, and the cavities between them carry the fluid from suction to discharge. Anything that changes the elastomer — heat, swelling, hardening, tearing — opens that line, and delivery falls at unchanged speed. On an engine-room sludge or bilge pump the first sign is usually a tank that takes longer to empty than it used to.
Tanks pumped to empty
Sludge, bilge and oily-water pumps draw from tanks and wells that are emptied to the bottom, and an elastomer stator running without fluid overheats along its own seal line. NETZSCH describes its dry-running protectors as guarding the elastomer parts against thermal damage and lists them as optional on its marine pumps, so whether one is fitted, and whether it tripped, belongs in the enquiry.
A stator chosen for one fluid, run on another
In NETZSCH's NEMOLAST chart for industrial applications the natural-rubber, chlorinated-polyethylene and EPDM grades are rated insufficient against oil and petrol, while the fluorine-rubber grade is rated very good. A pump specified for sewage and later moved to oily water or sludge can see its stator swell and grip the rotor. The medium on today's duty, not the one in the original order, decides the replacement compound.
Scored rotors and scrubber service
Tank scale and sand score the rotor surface, and a scored rotor will damage a new stator in short order. NETZSCH also shows NEMO pumps on magnesium-oxide service in a scrubber system, a solids-laden duty where the rotor is inspected at every stator change rather than assumed sound.
Joint seals before joints
NETZSCH's B universal pin joint is oil-filled and closed by a NEMO SM seal; the V pin joint carries hardened bushes that can be replaced at maintenance. Once a joint seal is cut, the joint runs in the pumped medium and pins and bushes wear until play shows at the coupling rod. Joint seals are worth inspecting whenever the stator is out.
NETZSCH pump components that appear on RFQ lines
The NEMO groups run from the drive end — coupling rod and joints, rotor and stator, shaft seal, housings — with the NOTOS, TORNADO and macerator groups after them, so each line can carry the sectional-drawing position number NETZSCH itself asks for.
- Coupling rods, including split rods with the sleeve coupling on FSIP pumps
- Pin joint sets — pins, bushes and SM seals
- K-joint seals and flexible coupling rods
- Rotors in metal executions and NEMO CERATEC ceramic rotors
- Conventional stators by NEMOLAST compound
- iFD-Stator elastomer parts and two-part stator housings
- xLC stator adjustment unit parts
- Single-acting mechanical seals and cartridge seal units
- Double-acting seals, quench and barrier-system items
- Gland packing for stuffing-box executions
- Bearing-housing bearings and shaft seals on SY pumps
- Inspection-cover seals and housing gaskets
- Dry-running protection devices
- NOTOS spindle sets, bearings and shaft seals
- TORNADO lobes, elastomer inserts, cartridge seals and synchronising belts
- Macerator cutting elements for N.Mac and M-Ovas units
Plate data that makes a NETZSCH enquiry quotable
NETZSCH identifies a spare part from the machine number, the sectional-drawing position number and the machine type or material number. A buyer who sends the same three things, plus what the pump handles today, has given what is needed to quote the right rotor, stator or joint. Size and design letters alone do not do it: all four NEMO rotor/stator geometries share the same external dimensions and connections, so the housing cannot show which pair is inside.
- Type designation exactly as stamped, every character — NEMO codes begin NM, followed by the size figure and design letters such as BY or SY
- Machine number, from the plate or the pump documents — the first item NETZSCH itself asks for on a spare-parts order
- Maker name as written: NETZSCH Pumpen & Systeme, NETZSCH-Mohnopumpen, or a Heishin plate reading Mohno
- Sectional-drawing position numbers from the spare-parts list or the pump manual
- Material numbers from an earlier order confirmation or parts list, where kept
- Stator build — conventional tube or iFD two-part housing — and whether an xLC unit is fitted
- NEMOLAST compound from the documentation or any marking on the stator
- Joint type where known — B, V, K or flexible rod — with a photograph of both rod ends
- Suction housing photographed: standard, or FSIP with the large inspection cover
- Pumped medium and duty today, and whether a dry-running protector is fitted
Tools for this equipment: the mechanical seal material code for the seal faces and the flange identifier for the suction and discharge flanges.
Supply route review for NETZSCH pump equipment.
Four geometries behind one housing, two ways of building a stator and three pump principles under one maker name: geometry, stator build and medium are settled before anything is priced, and each line is offered as OEM-route or verified alternative, stated on the line itself.
Geometry from the documents, not the housing
S, L, D and P rotor/stator pairs fit the same NEMO housing and change what the pump delivers. The geometry is confirmed from the type designation, the machine number or the parts list before a rotor or stator is priced.
Stator build named on the line
A complete vulcanised stator and an iFD elastomer part are separate items. A request that just says stator is queried back before any supplier is approached.
Compound checked against today's medium
The compound on the original order is a starting point, not the answer. If the pump has moved from sewage to oily water or sludge, that is raised before a like-for-like stator is quoted.
FSIP conversions recognised
Installed BY and SY pumps can be upgraded to FSIP, so the housing photograph is compared with the order documents. A split coupling rod or a cartridge seal on the pump changes the parts list.
NEMO, NOTOS and TORNADO kept apart
A progressing cavity pump, a screw pump and a lobe pump can carry the same name on the plate and stand in the same engine room. The wear list follows the principle and the designation, not the maker name.
Registered in Tallinn, Estonia
Vessel Core OÜ is an Estonian company, Reg. 17028043, VAT EE102773714. Supply route, handover and documentation for each line are confirmed in the quotation.
NETZSCH pump parts — questions from the engine room
Can a NEMO stator be ordered from the pump size alone?
No. NETZSCH builds four rotor/stator geometries — S, L, D and P — with identical external dimensions and connections, so one housing can carry any of them, and the compound and stator build vary as well. The full type designation and the machine number, or the material number from an earlier order, settle the geometry; the pumped medium settles the compound.
What changes in the order between a conventional NEMO stator and an iFD-Stator?
A conventional stator has its elastomer vulcanised into the tube, so the whole stator is replaced. The iFD-Stator 2.0 has a reusable two-part housing with a polygonal profile, and only the NEMOLAST elastomer part inside it is renewed. Say which build is fitted — a photograph of the outside of the stator usually shows it — because the two are separate parts lines.
Our pump plate says Mohno — is it a NETZSCH pump?
Not necessarily. NETZSCH's pump company traded as NETZSCH-Mohnopumpen GmbH until 2012, so older NETZSCH plates and manuals may carry that name; Heishin in Kobe sells its progressing cavity pumps under the Mohno Pump name, and NETZSCH names Heishin as its cooperation partner in Japan. The type designation decides: NEMO codes begin NM, while the Heishin progressing-cavity codes include NHL, NVL, NTH, NY and 2NL.
Why did our sludge pump stator fail soon after the tank was pumped dry?
An elastomer stator relies on the pumped fluid to carry away the heat of its own seal line, and running dry damages it thermally. NETZSCH offers dry-running protection to guard the elastomer parts, but on marine pumps it is optional. Send photographs of the stator ends and the rotor surface and say whether a protector is fitted; if the rotor is marked, rotor and stator are quoted together.
Can Vessel Core also review NETZSCH NOTOS and TORNADO pumps?
Yes. NOTOS multi-screw pumps on lube oil, fuel, steering gear and bunkering duty, and TORNADO rotary lobe pumps on sewage, ballast and oily-water transfer, are reviewed from the same evidence — designation, machine number and drawing position numbers. Their wear lists differ: spindles, bearings and shaft seals on NOTOS; lobes, elastomer inserts, seals and the synchronising belt on TORNADO.
Is Vessel Core connected to NETZSCH?
No, and there is no agreement of any kind. Vessel Core holds no distribution, representation or partnership agreement with NETZSCH, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Send the plate, the machine number and the medium.
List the type designation, machine number, stator build and the fluid the pump handles today, with the components required and the port. Rotor, stator, joint parts and shaft seal are quoted as separate lines, so the ship can decide what to fit now and what to carry as a running spare.
