*TM 5-810-4/AFM 88-8, Chap. 3
under heavy dust conditions.
c. Dry filters have an efficiency of 99 percent of particles
larger than 10 microns. Because of their high filtration effi-
ciency, these filters are the best selection for rotary and
reciprocating compressors. They must be used for nonlubri-
cated compressors and whenever air must be kept oil-free.
d. Two-stage dry filters, to provide 99 percent efficiency
of particles larger than 0.3 micron. will be used for cen-
trifugal units
e. With all types of filters, a means of monitoring the air
pressure drop through the element must be provided. which
indicates element contamination.
2-6. Dust and vapors.
All air compressors are sensitive to dust and airborne vapors
which can form adhesive, abrasive, and corrosive mixtures
within the compressor. These contaminants build up in rotat-
ing parts and can induce excessive wear and mechanical
unbalance, thereby damaging the compressor.
2-2
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