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Figure 2-2 Compressor Cooling, Lubrication and Discharge System
• Serves as the compressor fluid sump.
• Houses the final fluid separator elements.
The compressed air/fluid mixture enters the receiv-
er and is directed against the ends of the tank. The
direction of movement is changed and its velocity
significantly reduced, thus causing large droplets of
fluid to form and fall to the bottom of the
receiver/sump. The fractional percentage of fluid
remaining in the compressed air collects on the sur-
faces of the dual separator elements as the com-
pressed air flows through them. Two return lines (or
scavenge tubes) lead from the bottom of each sep-
arator element to the interstage of the compressor
unit. Fluid collecting on the bottom of each separa-
tor is returned to the compressor by a pressure dif-
ference between the receiver and the compressor.
Sight glasses are located in the return lines to
observe this fluid flow. There are also orifices in this
return line (protected by strainers) to assure proper
flow. By pressing the "
II, the operator may monitor the condition of the
separator elements by reading differential pressure
" pad on the Supervisor
DESCRIPTION
on the digital display. At a differential of 10 psid (0.7
bar) or greater, the operator will be told to service
the separator element. At this time, separator ele-
ment replacement is necessary.
The receiver is an ASME pressure vessel. A combi-
nation minimum pressure/check valve, located
downstream from the separator, assures a mini-
mum receiver pressure of 160 psig (11bar) during
full load operation. This pressure is necessary for
proper air/fluid separation and proper fluid circula-
tion while supplying air to the system. This valve
also acts as a check valve preventing compressed
air in the service line from bleeding back into the
receiver on shutdown and during operation on the
compressor in an unloaded condition.
A pressure relief valve (located on the wet side of
the separator) is set to open at rated tank pressure.
The compressor is also equipped with high pres-
sure shutdown protection to shut down at high MAX
P1 setpoint. This prevents the relief valve from
opening. High temperature probes are provided to
shut down the compressor.
Section 2
7
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