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Section 4
COMPRESSOR SYSTEMS
Figure 4-5 Lubrication System
efficiency, replaceable element filter, and a multi-
port manifold, where the100°F (38°C) filtered out-
flow is distributed to bearing and gear lubrication
points on the compressor and the gear box.
Filtered oil is also used to actuate the hydro actua-
tor linked to the inlet control valve.
The controller senses and displays the filter outlet
pressure and temperature. As a safety measure,
unless oil pressure builds up to 30 psig (2.1 barg)
within 15 seconds after startup, the controller shuts
down the unit. In addition, if the pressure drop
across the filter ports exceeds 20 psig (1.4 barg),
the controller displays a maintenance requirement
message.
All lubricated points return the oil to the sump by
gravity. Vents on the compressor timing gear cov-
ers and the gear box are also piped into the sump,
18
to avoid releasing oil vapor. The sump is vented to
atmosphere via a breather which includes an oil
vapor trap.
4.8 BUFFER AIR SYSTEM, FUNCTIONAL
DESCRIPTION
A small supply of cooled, compressed air is taken
downstream of the aftercooler moisture separator,
and used to feed the buffer air system. This com-
pressed air goes through a control air filter, and
then through a pressure regulator, where the pres-
sure is reduced from the compressor operating
pressure to 2-4 psig (0.14-0.28 barg) unloaded
(read from locally-mounted pressure gauge). This
clean, compressed air supply is fed to both first and
second compression stages. This air provides a
positive pressure buffer to the seals between the
compression air and oil sides of the stages, assur-
ing oil-free air. The buffer air is then drained from
each stage.
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