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The following definitions are intended to give basic understanding of the terms
commonly used in the pump industry. Some industry standards, or customer
specifications, may have specific meaning of certain terms that may be different
from their common usage - in such case the terms should be interpreted in the
context of the standards, or specifications, being referred to.
other (such as an impeller wear ring and case wear ring) seize and cause the
materials to bond together.
Galvanic corrosion - the accelerated corrosion of the anodic metal when two
different metals are connected by an electrolyte solution. Example, a 304
stainless steel wear ring will fail from galvanic corrosion in a 316 stainless steel
impeller in the presence of acidic solution.
Gap ring -
Garter spring - a long coil spring with its two ends connected often used to
force a radial lip seal against a shaft.
Gas content -
Gasket - a rubber, elastomer, or metal ring, wrapped around a joint, or placed
between two mating surface to make the joint or surface watertight and free from
Gauge pressure - the pressure measured by a calibrated dial gauge (or an
equivalent digital read-out) indicating a pressure measurement above
atmospheric pressure, usually expressed in pounds per square inch (PSIG). If
the atmospheric pressure is added to the gauge pressure, the sum is referred to
as absolute pressure, and expressed in pounds per square inch absolute (PSIA).
Gland bolting -
Gland follower - an axially movable part of stuffing box that is forced against
the packing rings by manual adjustment to increase the radial sealing force,
mechanical seal to the seal chamber or stuffing box.
Greene Tweed –