BE Pressure supply 80 Gallon Enclosed Rotary Screw Compressor AC1080SQ - Manual (Page 10)

10
Minimum Pressure Valve
As the compressed air leaves the compressor it goes through a minimum
pressure valve. This is set to maintain at least 85 psig (586kPa) in the
sump when the compressor is running. This is to insure that there is
pressure to force the oil out of the sump and through the oil system so
that sufficient oil is injected into the compressor. It is also necessary to
provide good air/oil separation. The valve acts as a check valve to
prevent back flow into the compressor from the plant system.
Cooling
The compressor has an air-cooled and after-cooler as standard. The
following are the heat loads and cooling airflow rates that must be
accommodated.
Head Load of Compressor
The compressor is an oil flooded unit. The oil lubricates, seals, and cools the
internals of the compressor.In cooling it picks up the heat generated by the
compression process and the mechanical friction from the bearings. So the oil
must be cooled to within 60 degrees Fahrenheit of the ambient temperature.
The after-cooler has been designed for a minimum approach of 15 degrees F
MODEL TOTAL HEAT LOAD REQUIRED FLOW
B/MIN CFM
5-7.5HP 805 1767
10HP 1064 2335
15HP 1587 3483
20HP 2104 4619
25HP 2727 5985
30HP 3250 7134
40HP 4256 9341
50HP 5325 11,700
60HP 6390 14,040
75HP 7988 17,550
100HP 10,650 23,400
125HP 13,313 29,250
150HP 15,975 31,100
200HP 21,300 46,800
250HP 26,625 58,500
300HP 31,950 70,200
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