Sulzer GSA 400/300
Sulzer Pumps Sulzer GSA 400/300 — Pumps, cooling.
Inspector Detail
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Common issues
- Mechanical seal leakage from dry running or seal face wear
- Cavitation from insufficient NPSH - blocked strainer or low suction head
- Bearing overheating from misalignment or lubrication neglect
- Reduced flow/head from impeller and wear ring erosion
- Vibration from impeller fouling or cavitation damage
- Corrosion/erosion of wetted parts in seawater cooling service
Inspection checklist
- Check mechanical seal for leakage
- Measure bearing temperature and vibration under load
- Check coupling alignment
- Inspect and clean the suction strainer
- Check wear ring clearance at overhaul
- Verify pressure/flow readings against baseline commissioning data
- Check foundation and pipework for looseness or strain on the casing
- Confirm correct rotation direction after any electrical work
Service intervals
| Bearing lubrication | per the manufacturer's interval, typically annually or per running-hour schedule |
| Mechanical seal inspection | annually, or immediately on leakage |
| Coupling alignment check | annually or after disturbance |
| Strainer cleaning | weekly to monthly depending on water quality |
| Wear ring clearance check | at major overhaul, typically every 4-6 years depending on service |
Typical wear limits
| Impeller/wear ring radial clearance | typically doubles from new-build clearance before efficiency loss becomes significant for this pump class - confirm the specific figures in the pump's own manual, not a generic value |
| Shaft runout at coupling | keep within the manufacturer's alignment tolerance for smooth running rather than a generic figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal kit
- Impeller
- Wear rings
- Bearing set
- Shaft sleeve
- Gasket/O-ring set
Safety
- Isolate and depressurise before opening the casing or seal housing
- Hot surfaces possible if pumping heated media - allow cooldown before work
- Do not run against a closed discharge for extended periods - overheating and pressure risk
- Secure electrical isolation (LOTO) before any mechanical work on the driver
Class survey
If in essential cooling service (main engine, generator, or other class-relevant system), surveyors expect evidence of standby pump availability, overhaul records, and inclusion of the pump in the planned maintenance system (PMS) with completed job history.
Components & Design
Component data being added…
Technical Data
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