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Technical Information
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Glossary of Terms
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ANSI
American National Standards Institute, Inc.
API
American Petroleum Institute
ASME
American Society of Mechanical Engineers
ASTM
American Society for Testing and Materials
Anodize
A process for aluminum, similar to zinc or chrome plating steel, in which an aluminum part is
electrically charged then, dipped in various chemicals to produce various colors and/or surface hardness.
Burst Pressure
The pressure at which rupture occurs.
Chamfer
To cut an angle on the hose tube to aid in stem insertion and to prevent the hose end from flaring when a
stem is inserted.
Clamp
A metal fitting, band or wire used around the outside of a hose end to secure a coupling, fitting or nipple.
Cold Flow
Continued deformation or movement of rubber under stress.
Compression Set
The deformation that remains in rubber after it has been subjected to and released from stress such as a
clamp. The longer the stress is maintained the more definitive the deformation.
Coupling
A device at the end or ends of a length of hose that allows a connection to be made.
Crimping
The act of forming the metal sleeve or ferrule of a hose fitting with a surrounding series of die segments
to compress the hose within the fitting. The crimping process changes the shape of the entire
circumference and length simultaneously. Often interchanged with the term "swaged".
Durometer
An instrument for measuring the hardness of rubber.
Durometer Hardness
A numerical value which indicates the resistance to indentation of the blunt indentor of the durometer.
Elastomer
Any of various elastic substances resembling rubber.
Expansion Ring
Typically refers to a type of fire hose couplings that are attached by expanding a sleeve (usually brass)
outward to compress the hose against the wall of the bowl of the coupling.
External Swage
A ferrule is passed through a reducing die, usually split, to bring the ferrule OD down to a predetermined
(Swaging)
size (for proper coupling retention) forcing the hose tube down into the stem serrations.
Ferrule
A collar placed over a hose end to attach the fitting to the hose. The ferrule may be crimped swaged,
forcing the hose against the shank of the coupling, or the shank may be expanded, forcing the hose out
against the ferrule, or both.
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