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Oil Free Air Compressors
Ambient air — The air
around or surrounding you.
Aftercoolers — Heat
exchanger that cools discharge air from the compressor (provides
the most effective
means of removing moisture from compressed air approximately.
70% of water is removed).
Air-cooled compressors — Atmospheric air is circulated
to cool the
unit and /or the compressed air.
Air end — Compression chamber (chamber where air is compressed).
Approach temperature — Temperature above ambient.
Boosters — Increase air pressure (usually four times inlet
PSI).
Boss hose fitting — Threaded fitting to connect hose from
compressor or extend
the length of hose used to flow gases.
Chicago Fitting (crows foot) — 1/4 turn fitting that can connect
hose to
the compressor or extend the length of hose used to flow gases.
CFM — Cubic feet per
minute.
Centrifugal compressors — Compression of
air/gas through
turning impellers.
Condensate — Liquid discharged from compressor and /or
air treatment equipment.
Dew point — Temperature that moisture changes from vapor
to liquid.
Dew point suppression — Temperature below ambient.
Dynamic-type compressors — Air or gas is compressed by
rotating vanes or
impellers.
Filters — Devices that separate and /or remove undesired
liquids and particulates
from compressed air. High-pressure air — Compressed
air above 150 PSI.
Instrument-quality (IQ) air — Treated compressed
air from
an oil-flooded
compressor (aftercooled, filtered).
Low-pressure air — Compressed air 150 PSI or lower.
Multicasting compressors — One
motor can run
two or more
compression chambers.
Multistage compressor — Compressor
with two or more stages.
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Microns — Measurement
used to define particulates in the air stream (one
micron = one millionth of a meter,
about one eighth the
thickness one
human hair).
Oil-flooded air — Compressed air produced by a compressor
that utilizes lubricating
oil in the compression cycle.
Oil-free air — Compressed air produced by a compressor
with no oil present
in the compression cycle.
Oil separator — Device used in an oil-flooded system to
recycle oil back to
the air end.
OSHA valve — Valve used to depressurize a system when
pressure
drop is noticed.
PSI — Pounds per square inch (unit for pressure of compressed
air).
Particulates — Any solid material, such as dirt, rust,
weld
fines, pollen, etc., that is in the air stream.
PPM — Parts per million, measurement of the oil present
in compressed air.
Receivers — Tanks
used to store compressed air and help dampen discharge
line pulsations.
Reciprocating compressor — A piston in a cylinder produces
compression.
SCFM — Standard cubic feet per minute.
Standard air — Air
at a temperature of 68° F, 14.70
PSI atmospheric pressure, and relative humidity of 36% (per ASME). In the
gas industry, temperature is
60° F.
Standard compressed air — Untreated compressed air
from an oil-flooded system
(not after-cooled or filtered).
Rotary compressors — Compression
is produced by the positive action of rotating
elements.
Two-stage compressors — Two-compression chambers
(initial to intermediate) with
one air discharge.
Whipcheck — Safety cable used to restrain air hoses
if an end breaks.
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