Modular S S32-25-110N
DESMI Modular S S32-25-110N — Bilge pump, self-priming, super bilge.
Inspector Detail
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Common issues
- Mechanical seal leakage from dry-running or debris passing through the pump
- Loss of prime after standstill, often due to a worn foot valve or air trapped in the casing
- Impeller and wear-ring erosion from grit, rust scale and rag/debris in bilge water
- Bearing wear or overheating from misalignment or blocked cooling flow
- Strainer/suction line clogging causing cavitation and reduced flow
- Coupling misalignment leading to vibration and premature seal failure
- Motor overheating or tripping from prolonged dry running
Inspection checklist
- Check mechanical seal area for weeping or staining
- Verify self-priming time against the maker's baseline figure
- Inspect suction strainer and clear of debris
- Check coupling/shaft alignment
- Listen and check for cavitation noise or vibration at running speed
- Check bearing housing temperature and audible condition
- Inspect discharge non-return valve for correct seating
- Check foundation bolts and pipework supports for looseness
- Megger-test motor insulation resistance
- Confirm local/remote start and bilge alarm interlocks operate correctly
Service intervals
| Mechanical seal inspection | annually, or sooner if leakage is noted |
| Suction strainer cleaning | monthly, more often if bilges are dirty or oily |
| Bearing condition check | annually as part of running gear survey |
| Coupling alignment check | annually or after any pump/motor removal |
| Insulation resistance test | annually |
| Impeller/wear-ring clearance check | at overhaul, typically every 3-5 years depending on running hours |
Typical wear limits
| Impeller-to-casing running clearance | typically a few tenths of a millimetre for this pump size class - confirm against DESMI's own manual before renewing wear parts |
| Shaft runout at seal area | small fractions of a millimetre are normal; excessive runout drives seal leakage - check against maker tolerance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal kit
- Impeller
- Wear ring / casing ring set
- Shaft sleeve
- Gasket and O-ring set
- Bearing set
- Coupling element (flexible insert)
Safety
- Bilge water frequently carries oil residue - slip and fire hazard around the pump seat
- Rotating shaft and coupling must have guards fitted before running
- Electrical hazard at the motor terminal box during maintenance - isolate and lock out first
- Pinch points at the coupling during alignment work
Class survey
Bilge pumps are part of the vessel's bilge and ballast pumping arrangement reviewed under SOLAS/class rules; surveyors typically check pump capacity/duty during periodic bilge system tests and confirm the pump can be run independently of the main engine per the approved bilge pumping arrangement.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of impeller blade surfaces for pitting, erosion, material loss, or uneven wear patterns; listen for cavitation noise during operation; monitor flow rate reduction
Check for liquid dripping at seal housing, visual inspection of seal faces for scoring/wear, verify seal pressure and condition; replace if leakage exceeds acceptable limits
Monitor bearing temperature (should not exceed 80°C), listen for grinding noise or vibration, check lubrication levels in larger bearing types with lubrication points
Verify suction strainers are clean and not restricted, check NPSH margin at operating point, monitor for cavitation symptoms or reduced prime capability
Test priming capacity and time to full prime, inspect check valve operation and seal integrity, verify diffuser passages are not blocked (for SA and Modular S series)
Type-general inspection and maintenance points for this equipment category — not model-specific.
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