Section 5
COMPRESSOR SYSTEMS
20
Figure 5 ---3 Compressor Cooling and Lubrication S ystem (200, 250, 300HP/150, 187, 225KW Water---cooled)
The receiver(s) is an ASME pressure vessel. A
combination minimum pressure/check valve, lo-
cated downstream from the separator, assures a
minimum receiver pressure of 50 PSIG (3.4 bar)
during full load operation. This pressure is neces-
sary for proper air/fluid separation and proper fluid
circulation while supplying air to the system. This
valve also acts as a check valve preventing com-
pressed 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 if the sump pressure
exceeds 150 PSIG (10.3 bar).
All Sullair compressor models are equipped with
high pressure shutdown protection to shut down
the compressor at 135 PSIG (9.3 bar). This pre-
vents the pressure relief valve from opening under
normal conditions, thereby preventing fluid loss
through the pressure relief valve. A temperature
switch will shut down the compressor if the dis-
charge temperature reaches 235_F (113_C).
WA R N I N G
!
DO NOT remove caps, plugs, and/or other com-
ponents when compressor is running or pressur-
ized.
Stop compressor and relieve all internal pres-
sure before doing so.
Fluid is added to the sump via a capped fluid filler
opening, placed low on the receiver tank to prevent
overfilling of the sump. A sight glass enables the
operator to visually monitor the sump fluid level.
5.6 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION (400, 500 AND
600HP/300, 375 AND 450KW)
R e f e r t o F i g u r e s 5 --- 4 a n d 5 --- 7 . T h e c o m p r e s s o r
unit discharges the compressed air/fluid mixture
through a discharge check valve into the sump.
The air/fluid mixture enters the sump and is di-
rected against the tank. Its direction of movement
is changed and its velocity significantly reduced,
thus causing the large droplets of fluid to fall to the
bottom of the tank. The compressed air with the re-
maining fluid enters the receiver. As the com-
pressed air passes through nested separators (pri-
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