SEEPEX BNM Pumps
Spare Parts for SEEPEX BNM Maintain-in-Place Pumps
Product Summary
Genuine and compatible spare parts for the SEEPEX BNM, the large maintain-in-place standard pump with Rotor Joint Access and Drive Joint Access, so the rotor, stator, seal and joints can be serviced without removing pipework. Tick the parts you need and we’ll match them to the type code on your nameplate.
Spare Parts List
✓ Tick the parts you need. SEEPEX parts are matched to the pump range, size, rotor/stator geometry, stator elastomer and shaft seal, so the type code and the commission number on your nameplate are all we need to get them right. Not sure which items? Add a photo of the nameplate and we’ll work it out for you.
| Select | Wear / Service Item | Function & when to replace |
|---|---|---|
| Common Service Kits | ||
| Rotor & Stator Set | The pumping elements, swapped through the sliding Rotor Joint Access housing without dismantling the pipework. Replace together when output has dropped or the rotor is scored. | |
| Joint Parts Set (rotor and drive side) | Wear parts for both pin joints. Drive Joint Access lets the drive and coupling rod unit come out the back of the suction casing for joint service. | |
| Shaft Seal & Gasket Set | The mechanical seal and the housing gaskets and O-rings. Renew whenever the pump is opened or the seal weeps. | |
| Wear & Consumable Parts | ||
| Stator | The elastomer-lined pumping element and the part that wears most. Replace when flow or pressure drops, after a dry run, or if the elastomer has swollen or torn. | |
| Rotor | The helical rotor inside the stator. Replace if scored, pitted or worn through its coating. | |
| Mechanical Seal | Replace at the first sign of leakage at the drive end of the suction casing. | |
| Joint Grease | Fresh grease at every joint service; SEEPEX specifies its own grease. | |
| Other Core Parts | ||
| Coupling Rod | Carries the drive to the rotor through the pin joints. Replace if the bores are worn or the rod is bent. | |
| Plug-in / Drive Shaft | Connects the drive to the coupling rod and carries the shaft seal. Replace if worn under the seal. | |
| Rotor Joint Access Housing Parts | The sliding housing section and its seals that open for rotor, stator and seal service. Replace damaged seals or guides. | |
| Drive Unit (gearmotor) | The flanged gearmotor (block design) or the separate drive train on bare-shaft builds. Matched to your kW, output speed and mounting so the replacement bolts straight on. | |
| Complete Replacement Pump | When a rebuild doesn’t stack up, we quote a like-for-like SEEPEX BNM pump from the type code and commission number on your nameplate. | |
How we confirm the exact part: BNM parts depend on size, rotor/stator geometry, stator elastomer, joint type and seal. Your nameplate carries the type code and the commission number, which together pin down the build. Tick the items above and add a nameplate photo, and we’ll confirm the correct parts for your exact pump.
Models
BNM is SEEPEX’s large standard pump with maintenance access; read the size code from your nameplate and select it below, or choose “Not sure”.
Models & Key Specifications
| Feature | Detail |
|---|---|
| Conveying capacity | 3–300 m³/h |
| Pressure | up to 48 bar |
| Rotor Joint Access | sliding housing for rotor, stator and seal service |
| Drive Joint Access | drive and coupling rod unit removed from the rear of the suction casing |
From seepex.com. No public BNM operating instructions, so parts are listed by function; we confirm the exact items from your nameplate.
Troubleshooting
Pump runs but delivers little or nothing
Likely cause: worn stator and rotor, a blocked suction line, or speed too high for a viscous product (cavitation). Action: clear the suction line and check the speed against the duty; if output is still down, replace the stator (item 601), and the rotor (item 600) if it is scored.
Stator wears quickly or burns out
Likely cause: dry running, solids or grain size too large for the pump speed, or product temperature too high for the elastomer. Action: fit a new stator, reduce speed or screen the feed, keep the pump full at start-up and fit dry-run protection; SEEPEX also suggests an undersize rotor for hot duties.
Pump hard to turn or will not start after a stator change
Likely cause: stator swollen by an incompatible product, or product that has settled, gummed up or set inside the pump while it stood. Action: check the stator elastomer against the product and select a suitable material; rinse and clean the pump immediately after stopping, and heat it if the product hardens when cold.
Knocking or noise from the suction casing
Likely cause: worn joint parts or too much joint play, often with grease lost through a split joint sleeve. Action: renew the complete set of joint parts with SEEPEX pin joint grease and check the coupling rod bushings are correctly fitted.
Leaking at the shaft seal
Likely cause: a worn mechanical seal (sliprings or O-rings) or packing that is worn or set too tight. Action: check the sliprings and O-rings for wear and chemical resistance and renew the seal; on packed pumps adjust the gland or renew the packing rings.
Motor runs hot or trips
Likely cause: over-pressure against a closed or blocked discharge, a swollen stator, or worn bearings in the drive. Action: check discharge pressure and motor current, inspect the stator for swelling, and renew the drive bearings if they are rough; fit pressure protection on the discharge.
Request for Quotation
Selected Parts:
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Not sure which parts? Just send a photo of the nameplate or part below.