Minex
Grindex Minex — Drainage - Compact drainage pump.
Inspector Detail
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Common issues
- Mechanical seal wear allowing water ingress into the motor housing
- Impeller wear or clogging from solids beyond the pump's rated passage size
- Cable gland/entry seal degradation causing motor moisture ingress
- Thermal protector nuisance tripping from running dry or against a closed valve
- Bearing wear from prolonged operation in abrasive or dirty water
- Float switch/level control fault causing dry-running or overflow
Inspection checklist
- Check the oil chamber (seal housing) for water content or emulsification
- Insulation resistance (megger) test of the motor windings
- Inspect impeller and pump housing for wear, clogging, or solids damage
- Check cable and gland for cuts, abrasion, or perished insulation
- Function-test thermal protection and float switch, if fitted
- Check lifting handle/chain and discharge coupling for corrosion or wear
- Verify the pump runs within rated current draw at test flow
Service intervals
| Seal oil chamber check | typically every 1,000-2,000 running hours or every 6-12 months, whichever comes first |
| Insulation resistance test | every 6-12 months, or before returning to service after storage |
| Impeller/wear plate inspection | condition-based, typically annually or when flow/head drops off |
| Cable and gland inspection | every 6-12 months |
Typical wear limits
| Seal chamber oil water content | any significant water content or emulsification at inspection indicates seal wear and warrants seal replacement - no fixed percentage threshold published, follow maker's service manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical shaft seal kit
- Impeller
- Cable entry seal/gland kit
- Seal chamber oil (correct grade per maker)
Safety
- Electrically isolate before handling - a submersible pump with a failed seal presents a shock hazard
- Confined space/drainage pit precautions when retrieving or installing the pump
- Do not run dry or against a closed discharge valve - risk of overheating and seal damage
Class survey
Portable/emergency drainage pumps are often checked during fire and emergency equipment surveys for availability, condition and correct stowage rather than as a fixed CSM item; where fitted as a permanent bilge/drainage pump, verify against the vessel's approved bilge pumping arrangement.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of impeller surface, hard-iron coating integrity, and strainer perforations. Check for pitting in hydraulic surfaces.
Run pressure drop test across seal cavity; measure leakage rate at discharge. Inspect seal chamber for contamination ingress.
Megohm meter (insulation resistance test) across motor windings to ground at 500-1000VDC. Document baseline and trending.
Visual inspect cable jacket for cracks, UV damage, moisture ingress. Measure conductor resistance and insulation resistance annually.
Temperature monitoring of bearing housing (should not exceed 65°C). Visual inspection of oil color/clarity in accessible bearing cavities post-operation.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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