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Compressed Air Glossary of Terms :: G ::
Glossary Index
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Gag
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A device attached to a safety or safety relief valve that
prevents it from opening at the set pressure.
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Galling
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A form of wear in which seizing or tearing of the gear or
bearing surface occurs.
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Gallon
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A unit of volume. A US gallon has 231 cubic inches or 3,785
liters.
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Gas
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A fluid (as hydrogen or air) that tends to expand
indefinitely. Is one of three basic phases of matter.
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Gas bearings
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Are load carrying machine elements permitting some degree of
motion in which the lubricant is air or some other
gas.
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Gas bypass
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A portion of the discharge gas is redirected through a heat
exchanger and then expanded back to suction pressure, where it is
mixed with normal suction gas stream and commonly used to
compensate for process flow demands.
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Gas compressor
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A machine that compresses gases. Divided into two groups;
process gas compressors and oil and gas field compressors.
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Gas drying
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The drying of compressed gases other than air. Equipment size,
choice of materials and other specifications may be decidedly
different for drying gases other than air because of the specific
properties of the gases. Properties include specific gravity,
specific heat, viscosity, thermal conductivity, explosive
characteristics, toxicity, corrosion and others.
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Gas laws
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The behavior of perfect gases, or mixtures thereof, follows a
set of laws. Boyle' law, Charle's law, Amonton's law, Dalton's
law, Amagat's law, Avogadro's law, Poisson's law.
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Gate valve
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A type of valve in which the closing element (the gate) is a
disc that moves across the stream in a groove or slot for support
against pressure. A gate valve has relatively large full ports and
a straight line flow pattern. Very little pressure drop however
subject to leakage if sealing surfaces are scored or marred or if
debris becomes lodged in grove.
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Gauge
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An instrument for measuring, testing, or registering.
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Gauge pressure
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Is pressure as determined by most instruments and gauges.
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Glycol dehydration
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A method of drying natural gas.
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Governor
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A motor controller that regulates the air flow through an end
plate into the motor to control the speed and power. A speed
regulation device built into or attached externally.
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GPM
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Gallons per minute
-
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Grade D breathable compressed air
-
ANSI specification for a Compressed air supply source that meets OSHA
specification # 1910.134(i)(1)(ii)requirements for breathing air.
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Gravimetric
efficiency
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The efficiency of the filter in removing some portion of a
specified test contaminant under a specific set of laboratory
conditions. It determines the mass of the contaminant the filter
removes from a known sample introduced to the filter.
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Guide
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The portion of a valve used to guide the disc.
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Guide vane
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A stationary element that may be adjustable and which directs
the flow medium to the inlet of an impeller.
Glossary Index
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Thanks to Impact RM for permission to reprint the glossary.
Compressed Air Glossary © Impact RM
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