CEH 6108
Sterling SIHI CEH 6108 — Cooling water pump - side channel self-priming.
Inspector Detail
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Common issues
- Mechanical seal wear/leakage, particularly during the self-priming phase
- Side-channel ring/impeller wear reducing capacity and head
- Bearing wear from misalignment or cavitation-induced vibration
- Cavitation from insufficient NPSH during self-priming
- Coupling wear or misalignment
- Seal overheating in high-temperature service if the seal cooling/flushing flow is lost
Inspection checklist
- Mechanical seal leakage check
- Coupling alignment check
- Bearing vibration and temperature monitoring
- Casing/side-channel ring clearance check against the maker's tolerance
- Self-priming time check against the pump curve/spec
- Capacity/head performance check against the original curve
- Seal cooling/flushing line condition where fitted for high-temperature service
- Foundation bolts and pipe strain check
Service intervals
| Mechanical seal inspection | annually or per running hours per maker's guidance |
| Bearing grease/oil renewal | per maker's schedule, typically every 2,000-4,000 hours or annually |
| Full overhaul (seal, bearings, wear rings) | typically every 3-5 years or per condition/running hours |
| Coupling alignment check | after any work disturbing the coupling, and at least annually |
Typical wear limits
| Side-channel ring/impeller clearance | renew once clearance exceeds the maker's specified limit - confirm the exact figure against the pump manual |
| Mechanical seal | renew at the first sign of leakage beyond an acceptable drip rate |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal kit
- Bearing set
- Coupling element
- Casing wear ring/side-channel ring
- Gasket set
Safety
- High-temperature service (rated up to 180 C) - burn hazard from casing and piping surfaces
- Side-channel pumps generate high head (this unit up to roughly 354 m per the data sheet) - overpressure risk if deadheaded against a closed discharge
- Coupling guard must be fitted and in place during operation
Class survey
Cooling water pumps in essential services are typically under Continuous Machinery Survey; class expects evidence of standby pump availability, seal/bearing maintenance records, and a performance check against the original curve after overhaul.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect sealing surfaces for weeping or spray; verify seal cooling/quench system operational; check packing gland for proper compression and water drips
Check oil level in bearing reservoirs; inspect for water ingress or discoloration; verify oil ring/paddle wheel rotation; measure bearing temperature and noise signature
Monitor suction gauge readings; check inlet screens and strainers for blockage; inspect impeller for pitting/erosion patterns; verify NPSH requirements are met
Measure clearances between impeller and casing wear-rings with feeler gauge; inspect for erosion grooves; verify pressure test integrity; check for internal leakage indicators
Verify water cooling system flow and temperature differential across jacket; inspect for salt deposits or corrosion in cooling passages; flush cooling circuits if operation in seawater
Type-general inspection and maintenance points for this equipment category — not model-specific.
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