Friday, November 14, 2008

screw compressor-normal operation

Some conditions are subject to slight variations as listed below:

1. Process gas pressures and temperatures - changes in process requirements may cause a variation in operating temperatures and pressures. System temperatures will vary directly with incoming gas temperatures. Temperature differential between inlet and discharge nozzles should remain fairly constant. Pressures will be dependent upon and affected by incoming gas and barometric conditions.

2. Bearing temperatures - bearing temperatures will vary slightly with ambient temperature and with lube oil temperature. Higher lube oil temperatures will produce proportionately higher bearing temperatures. A variation of 6 C to 11 C in bearing o o temperatures is of no consequence.
A running plot of all temperatures and pressures is advisable. Log all gauge pressure and temperature readings at initial start after unit has reached normal operating conditions. Use these initial readings as a guide and check frequently as recommended in “operational inspection”

Any rapid or gradual change, not due to process conditions, may indicate a possible malfunction.

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