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 CHAPTER 5.
COMPRESSED AIR DISTRIBUTION
APPLICATIONS AND SYSTEMS
Section 1.
1 COMPRESSED AIR USES. Compressed air is a form of power
which is very
u s e f u l in both mi l i t a r y a n d i n d u s t r i a l a p p l i c a t i o n s . " I t i s
of particular
advantage in appl i c a t i o n s that require intermittent power a
some distance
f r o m its source, as the air pressure can be maintained near
y constant during
w o r k intervals. Compressed air uses fall into one of three
power
categories:
service, process s e r v i c e , or control purposes.
Power S e r v i c e . In this application compressed a r either moves
something or exerts a force. Examples of power service uses are
p n e u m a t i c tool operation, air lifts, clamps, and cylinders.
Process Service. Compressed air used in this application becomes a
p a r t of the process itself. An example is the use of compressed air
in a combustion process. Compressed air provides oxygen for the
combustion process, and in turn it becomes a part of the combustion
p r o d u c t s and is no longer identifiable as air.
Control Purpose. Extensive use is made of compressed air to govern
and/or regulate various equipment by monitoring pressure or flow
rates of some substance. A pneumatically controlled combustion
system is an example of such an application.
2 COMPRESSED AIR DISTRIBUTION SYSTEM.
Compressed air d i s t r i b u t i o n systems
c o n s i s t of the following equipment:
Piping required to transport the compressed a i r from a central
compressor plant to the consumers
E q u i p m e n t , instrumentation, and related fat' l i t e s r e q u i r e d t o
accomplish the above described purpose safely a n d e f f i c i e n t l y
3 SUPPLY PRESSURE. C o m p r e s s e d air is distributed at low, medium, or high
pressures. I t must be dry and free of oil, dust. or other contaminants.
Refer to NAVFAC MO-206, Operation and Maintenance of Air Compressor Plants,
for methods of producing compressed air and removing moisture, oil, dust, and
other contaminants.
3.1 Low-Pressure Compressed Air Systems. These systems provide compressed
air at pressures up to 125 psig. When several air pressures are required
w i t h i n that range, t h e plant is usually designed for the highest pressure,
p r e s s u r e reducing stations supplying the lower pressures as required. Typical
l o w - p r e s s u r e applications follow.
5-1
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