Section 2
DESCRIPTION
8
Figure 2-4 Compressor Cooling/Lube and Discharge System (Water-cooled)
been shut down. The receiver has three basic func-
tions:
1. It acts as a primary fluid separator.
2. It serves as the compressor fluid sump.
3. It houses the final fluid separator element.
The compressed air/fluid mixture enters the re-
ceiver and is directed against the wall of the sump.
By change of direction and impingement action, the
larger droplets of fluid fall to the bottom of the sump.
The fractional percentage of fluid remaining in the
compressed air collects on the surface of the final
separator elements as the air flowsthrough the sep-
arators. As more and more fluid collects on the sur-
face of the elements, the fluid descends to the bot-
tom of the separators, where return lines (scavenge
tubes) lead from the bottom of the separator ele-
ments to the compressor unit. Fluid collected at the
bottom of the elements is returned to the compres-
sor unit by a pressure difference between the area
surrounding the separator elements and the com-
pressor. Orifices (protected by strainers) are in-
serted in the return lines to assure proper flow.
The sump is ASME code rated at 400psig (27.6bar)
working pressure. A minimum pressure valve, lo-
cated downstream from the separator, assures a
minimum receiver pressure of 160 psig (11 bar),
which is maintained during all conditions. This pres-
sure is necessary for proper fluid circulation and air/
fluid separation.
A pressure relief valve (located on the wet side of
the separator) is set to openif thesump pressureex-
ceeds 375 psig (25.9 bar). Also a temperature
switch will shut down the compressor when the dis-
charge temperature reaches 265ºF (130ºC) on first
stage or 265ºF (130ºC) on second stage.
All Sullair compressor models are equipped with a
high pressure shutdown switch to shut down the
compressor at 365 psig (25.2bar).This preventsthe
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