POOR PROCESS PRESSURE
I
I
PROBABLE CAUSE
I
SYMPTOMS AND SOLUTIONS
I
Leak. Leak check system and compare to original rate
of rise pressure test. Look for damaged
gaskets and leaks in checldisolation valves.
Check for leaks in inlet valve, and piping to
airend.
Pump is cold. Allow adequate warm-up time for pump to
reach operating temperature.
Low fluid level.
Fill fluid reservoir to proper level,
Condensation or contamination in fluid.
Replace pump fluid.
Shaft seal leak.
Replace shaft seal.
Drive motor RPM too low.
Check and replace motor as necessary.
Excessive back pressure/separator clogged.
Replace separator element-keep exhaust at
Iatmospheric pressure.
I
Temperature of system or process gas
Increases in temperature translate into ACFM
increasing. load. Keep temperatures constant.
Vapor load being generated.
Possible leak in water cooling jacket or water
piping in vacuum system. Leak check.
Materials of construction.
Materials not compatible with vacuum service.
Observe all vacuum engineering conventions.
\Clogged inlet filter.
lReplace inlet filter element.
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nlet valve not opening filly. Correct the situation in accordance with the
instructions in “Inlet Valve Not Opening or
Closing in Relation to Demand” section of the
trouble-shooting guide.
Differential pilot valve not set correctly.
Readjust differential pilot valve to achieve
desired modulation range.
Vacuum switch not set correctly.
Readjust the vacuum switch to the desired
I
cut-in and cut-out pressures.
Faulty vacuum gauge.
Replace vacuum gauge.
Wrong fluid.
Replace with recommended fluid.
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