Screw Pump · Pumps
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| Suction strainer cleaning | per maker schedule or when differential pressure indicates fouling, typically monthly |
|---|---|
| Mechanical seal inspection | annually or at first sign of leakage |
| Coupling alignment check | annually or after any pump/motor removal |
| Relief valve function test | annually |
| Screw set clearance inspection (overhaul) | per maker interval, typically every 15,000-25,000 running hours - confirm against the maker's manual |
| Screw set radial clearance | bauart-typical allowance is a small fraction of a millimetre and highly size-dependent - confirm against this pump's own maker tolerance table |
|---|---|
| Volumetric efficiency drop before overhaul consideration | typically flagged when output falls more than roughly 10-15% below the rated curve at rated pressure and speed - confirm against maker guidance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveys typically confirm relief valve function test records and, where the pump serves an essential service such as main engine lube oil, verify standby pump availability and changeover arrangements per the vessel's approved machinery arrangement.
Estimated lifetime: Triple-screw lube oil pumps of this type typically run 20,000-30,000+ hours between major overhauls given clean oil and proper alignment, with a long overall service life given periodic screw-set renewal
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