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• An old, obsolete standard that has been replaced by the A.N.S.I. standard.

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Link to Mc Nally home page www.mcnallyinstitute.com

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