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Section 4
COMPRESSOR SYSTEMS
Figure 4-3B Silencing/Discharge Air and Cooling Systems
noid, removing LP pilot air pressure from the pneu-
matic blowdown valve, opening the valve so that
process air will be evacuated to the silencer.
4.6 COOLING AND SILENCING SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to
Figure
4-3A,
charged by each compressor stage, it is sequen-
tially routed to:
· a silencer/dampener to reduce noise and pressure
pulsations caused by the compressor.
· heat exchangers to cool the compression process.
· combination separator/drains to remove liquids
condensed in the heat exchangers.
The LP stage silencer is a reactive pipework sized
to dampen lower frequency air pulses, while the HP
stage silencer is a reactive vessel sized to dampen
16
4-3B
and 4-4. As air is dis-
higher frequency pulses.
4.7 LUBRICATION SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to
Figures 4-4
Compressor delivers oil-free compressed air, but it
requires lubricant to maintain its high speed bear-
ings and gears in running order.
A gear-type pump draws lube oil from the base-
frame mounted sump and delivers it at a rate of
25gpm (79Lpm), and a pressure equal to approxi-
mately 100 psig (6.9 barg). An external bypass
valve maintains the set flow, while protecting the
pump against undesirable over-pressures. A ther-
mal mixing valve, set to open at 85°F (29°C)
ensures fast oil warm-up by bypassing oil around
the heat exchanger. The lube oil is sequentially
pumped through a heat exchanger, the first and
second stage compressor cooling jackets, a high
and 4-5. The DE-18 Series
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