FAULT
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LIKELY CAUSE
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Safety valve of 1st stage blows off (pressure exceeds blowing off
pressure 8 bar)
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2nd stage valve not working properly.
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Sealing between inlet and outlet of 2nd stage is faulty.
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Safety valve of 1st stage blows off (pressure below blowing off
pressure 8 bar)
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Safety valve faulty
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Safety valve of 2nd stage blows off (pressure below blowing
off, ultimate pressure+ 5%)
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Safety valve set too low or is faulty
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Safety valve of 2nd stage blows off (pressure above blowing
off, ultimate pressure+5%)
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Valve in air line to compressed air receiver closed.
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Pressure switch set too high.
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Pressure in 1st stage excessively high.
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2nd stage valve leaking.
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Pressure gauge in 1st stage indicates lower pressure.
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1st stage valve leaking.
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Air filter very dirty.
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No pressure indicated in 1st and 2nd stage
pressure gauges.
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No power at solenoid valves.
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Solenoid valve faulty.
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Temperature control responded.
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Due to cooling water deficiency.
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Poor heat transfer in cooler as a result of boiler scale formation.
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Oil pressure monitor has responded.
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The oil level is too low.
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The oil pump is faulty or leaking.
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Bursting disc in the cooling water circuit responds.
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Leakages in cooler.
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Pressure peaks in the cooling water circuit.
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Drain valve does not close.
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No supply voltage.
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Solenoid faulty.
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Foreign matter in
solenoid valve.
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Compressor makes loud noises.
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Connecting rod bearing faulty.
Gudgeon pin bearing faulty.
Crank shaft bearing faulty.
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Water in oil.
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Compressor over cooled because of :-
·
Too high cooling water flow rate
·
Improper room ventilation.
·
Very short compressor running time.
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Insufficient drainage.
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Untimely breaking of valve plates, valve springs or valve discs
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Insufficient drainage.
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Oil leaking from crank case.
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Gasket or shaft seal faulty
Screws loosened.
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Compressor shut down by over current relay of control system.
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The motor is overheated. Excessive current drawn.
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Piston seizure.
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Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
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