Adapter:
Connects and aligns the power end of an ANSI pump to the wet
end.
A.N.S.I. Standard
American National Standards Institute. A set of specifications
(envelope dimensions) for centrifugal pumps manufactured in the
United States
A.P.I. gland
A seal gland that incorporates a non sparking disaster bushing
along with a vent and drain connection (quench), and a flushing
connection.
A.P.I. Specifications
American Petroleum Institute Specifications. Usually adopted
by oil refineries for petroleum applications. Includes seal gland
and piping recommendations.
Absolute pressure
Atmospheric pressure added to gauge pressure.
Active metal
A corrosion resistant metal that has not been passivated. The
protective oxide layer has not formed.
Affinity laws
They predict how capacity, head and horsepower are affected by
changes in the centrifugal pump impeller diameter or shaft speed.
Air ingestion
Air is coming into the stuffing box because of a negative suction
pressure.
Alignment
The center line of the pump is perfectly aligned with the centerline
of the driver (usually an electric motor).
Alpha sintered
A type of silicone carbide that does not contain silica.
Ambient heat/pressure
The heat or pressure in the area where the equipment is located.
Annealing
To soften the metal by heating it to a predetermined temperature
somewhere below its melting point.
Anodize
A treatment used on aluminum to put a heavy stable film of oxide
on the metal surface.
Anti-friction bearing
Usually referring to a ball or roller bearing
Application
A description of the fluid and operating conditions that we are
trying to pump or seal.
Atmospheric pressure
At sea level, atmospheric pressure is 14.7 psi.
AVS Standard
An old, obsolete standard that has been replaced by the A.N.S.I.
standard.