Section 5
COMPRESSOR SYSTEMS
22
Figure 5 ---5 Compressor Cooling and Lubrication S ystem (400, 500, 600HP/300, 337, 450KW Water---cooled)
mary and secondary), the remaining fluid is re-
moved from the air. The fluid removed in the re-
ceiver in turn flows to the bottom of each separator
which is in turn returned back to the compressor
through two scavenger lines. Some fluid will drop
to the bottom of the receiver prior to the air entering
the separator elements. This fluid is also returned
to the compressor via another scavenger tube.
Sight glasses are provided in the scavenger lines to
observe this fluid flow. There are also orifices on
these lines (protected by strainers to assure proper
flow). By pressing the ∆P1 pad on the Supervisor,
the operator may monitor the condition of the sepa-
rator elements by reading differential pressure 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. All tanks, sump
and receiver are ASME pressure vessels.
A minimum pressure valve is provided to assure
minimum sump pressure of 50 PSIG (3.5 bar). This
pressure is necessary for proper air/fluid separa-
tion and to assure proper fluid circulation while
supplying air to the system. Also, a check valve is
provided to prevent compressed air in the service
line from bleeding back into the receiver during
shutdown, as well as in the unload operation.
A pressure relief valve (located on the sump) is set
to open if the sump pressure exceeds 150 PSIG
(10.3 bar).
The compressor is also equipped with high pres-
sure shutdown protection to shut down the com-
pressor at 135 PSIG (9.3 bar). This prevents the re-
lief valve from opening and dumping fluid under
normal conditions. Also, a high discharge tempera-
ture switch with three (3) sensing probes is pro-
vided to shut down the compressor if the discharge
temperature reaches 235_F (113_C).
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