WP 275 L Marine
Sauer Compressors WP 275 L Marine — Starting Air Compressor - Commercial Shipping (Levante Series).
Inspector Detail
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Common issues
- Valve plate wear or carbon buildup causing loss of capacity or stage overheating
- Piston ring wear leading to increased blow-by and reduced final pressure
- Intercooler/aftercooler fouling reducing cooling efficiency between stages
- Automatic condensate drain blockage or failure, allowing water carryover
- Safety/relief valve sticking or set-point drift
- Excessive oil carryover fouling the air receiver and starting air system
Inspection checklist
- Check final stage discharge temperature and pressure against baseline
- Inspect and clean intercoolers and the aftercooler for fouling
- Test automatic condensate drains on each stage
- Check safety/relief valve function, lift test where fitted
- Inspect valve plates for wear, carbon deposits, or breakage
- Check lubricating oil level, condition, and change per interval
- Check drive belt/coupling condition and alignment
- Inspect the air intake filter for fouling
- Check the unloader/capacity control system function
- Verify starting air receiver relief valves and pressure gauges are in test and in date
Service intervals
| Lubricating oil change | per the manufacturer's interval, commonly 500-2,000 running hours or annually, whichever comes first |
| Air/oil filter change | per the manufacturer's interval, commonly every 500-1,000 running hours |
| Valve inspection/overhaul | per the manufacturer's interval, commonly annually or per running-hour schedule for the duty |
| Condensate drain function test | monthly, or per the PMS |
| Safety/relief valve test | annually, per class/flag requirement |
| Intercooler/aftercooler cleaning | annually or on a rising discharge temperature trend |
Typical wear limits
| Piston ring end gap | increases progressively with running hours; rejection is commonly several times the new-build gap for this class - confirm the exact figure in the WP-series manual rather than assuming a fixed value here |
| Valve plate lift/wear | reject on visible pitting, cracking, or seat wear affecting sealing - no universal numeric limit; follow the manufacturer's inspection criteria |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Valve plate sets, per stage
- Piston rings and gasket set
- Intercooler/aftercooler element, if the design uses a replaceable core
- Automatic condensate drain valve
- Safety/relief valve
- Lubricating oil filter elements
Safety
- Starting air is stored at high pressure (this unit to 40 bar) - never work on the compressor or receiver without full depressurisation and isolation
- Risk of piping/receiver deposit ignition from excessive oil carryover - keep to oil change and carryover limits
- Hot surfaces on cylinder heads and interstage piping
- Never bypass or disable relief valves or unloader safety interlocks
- Follow lock-out/tag-out before any mechanical or electrical work
Class survey
Starting air compressors typically fall within the ship's essential auxiliary machinery survey scope; class expects evidence of periodic valve/piston inspection and safety valve testing. The associated starting air receivers carry their own periodic internal/external and hydraulic test regime - confirm this compressor's inclusion in the PMS and the receiver survey records separately.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Check oil level in pressure oil lubrication system and verify direct-drive gearwheel pump operation
Inspect safety valve, thermometer, and pressure gauges on all stages for proper function
Monitor lubrication oil pressure and compressed air outlet temperatures (as standard safety equipment)
Examine air filter element for clogging and replace if necessary to maintain charging capacity
Verify three-phase AC motor voltage (IP54 rated), frequency, and proper grounding
Check compressor cylinder walls and piston rings for wear; inspect gaskets and seals
Test final pressure setting (30 or 40 barg) against shipbuilding regulations requirements
Verify flexible mounting system integrity and vibration isolation
Type-general inspection and maintenance points for this equipment category — not model-specific.
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