Sullair 125 Operators Manual And Parts Lists page 17

Figure 2-2 Compressor Cooling and Lubrication System
Sullair compressor unit discharges compressed
air/fluid mixture into the sump. The sump has three
functions:
1. It acts as a primary fluid separator.
2. Serves as the compressor fluid sump.
3. Houses the air/fluid separator.
The compressed air/fluid mixture enters the sump
and is directed against the side of the sump. By
change of direction and reduction of velocity, large
droplets of fluid separate and fall to the bottom of
the sump. The fractional percentage of fluid remain-
ing in the compressed air collects on the surface of
the final separator element as the compressed air
flows through the separator. As more and more fluid
collects on the element surface, the fluid descends
to the bottom of the separator. A return line (or scav-
enge tube) leads from the bottom of the separator
element to the inlet region of the compressor unit.
Fluid collecting on the bottom of the separator ele-
ment is returned to the compressor by the pressure
difference between the area surrounding the sepa-
rator element and the compressor inlet. An orifice
DESCRIPTION
(protected by a strainer) is included in this return
line to assure proper flow.
The sump is ASME code rated at 200 psig (13.8
bar) working pressure. A minimum pressure device
located downstream from the separator, assures a
minimum receiver pressure of 85 psig (5.9 bar) dur-
ing all conditions. This pressure is necessary for
proper air/fluid separation and proper fluid circula-
tion.
A pressure relief valve (located on the wet side of
the separator) is set to open if the sump pressure
exceeds 200 psig (13.8 bar). A temperature switch
will shut down the compressor if the discharge tem-
perature reaches the specified limit given in Section
3, Specifications.
Fluid is added to the sump via a capped fluid filler.
WARNING
DO NOT remove caps, plugs, and/or other com-
ponents when compressor is running or pres-
surized.
Section 2
11