Page 33 - CorrugatedCatalog110913Rev8LR

Definitions
Flexible sleeve used to line the inside diameter of hose when
conveying a high-velocity media, also prevents erosion.
LIVE LENGTH
The amount of active (fexible) length of hose in an assembly.
Does not include the length of fttings and ferrules.
LOOP INSTALLATION
The assembly is installed in a loop or “U” shape and is most
often used when frequent and/or large amounts of motion are
involved.
MEDIUM, MEDIA
The substance(s) being conveyed through a system.
NOMINAL DIAMETER
Indicates the approximate inside diameter.
OFFSET-LATERAL, PARALLEL
The distance that the ends of a hose assembly are dis-
placed in relation to each other as a result of connecting two
misaligned terminations in a system, or intermittent fexure
required in a hose application.
OPERATING CONDITIONS
The pressure, temperature, motion, and environment to which
a hose assembly is subjected.
OUTSIDE DIAMETER (O.D.)
The external diameter of a metal hose, measured at the top of
the corrugation or braiding.
PERCENT OF BRAID COVERAGE
The percent of the surface area of a hose that is covered by
braid.
PITCH
The distance between the two peaks of adjacent corrugations
or convolutions.
PLY, PLIES
The number of individual thicknesses of metal used in the
construction of a wall of the convoluted hose.
PRESSURE
Usually expressed in pounds per square inch (psi).
PRESSURE, BURST
Failure of the hose where the braid fails in tensile, or the hose
ruptures, or both, due to the internal pressure applied.
PRESSURE, DEFORMATION
The pressure at which the convolutions of a hose become
permanently deformed.
PRESSURE, MAXIMUM ALLOWABLE WORKING
The maximum pressure at which a hose or hose assembly is
designed to be used.
PRESSURE, PULSATING
A rapid change in pressure above and below the normal base
pressure, usually associated with reciprocating type pumps.
This pulsating pressure can cause excessive wear between
the braid and the tops of the hose convolutions.
PRESSURE, SHOCK
A sudden increase of pressure in a hydraulic or pneumatic
system which produces a shock wave. This shock can cause
severe permanent deformation of the hose corrugations, as
well as rapid failure due to metal fatigue.
PRESSURE, STATIC
A non-changing, constant pressure.
PRESSURE, WORKING
The pressure, usually internal but sometimes external,
imposed on a hose during operating conditions.
RANDOM MOTION
The uncontrolled motion of a metal hose, such as occurs in
manual handling.
SAFETY FACTOR
The relationship of working pressure to burst pressure.
SPLICE
A method of joining two sections of hose.
SQUARELOCKED (See INTERLOCKED)
Refer to Stripwound catalog.
SQUIRM
A form of failure in which the hose is deformed into an “S” or
“U” bend as the result of excessive internal pressure
being applied to unbraided corrugated hose while its ends
are restrained, or in a braided corrugated hose which has been
axially compressed.
STRESS CORROSION
A form of corrosion in stainless steel normally associated with
chlorides.
STRIPWOUND (See INTERLOCKED)
Refer to Stripwound catalog.
TIG WELD/GTAW
The gas tungsten arc welding process sometimes referred to as
a “shielded arc” or “heliarc.”
TRAVELING LOOP
A general classifcation of bending wherein the hose is
installed in a U-shaped confguration.
TRAVELING LOOP, CLASS A LOOP
An application wherein the radius remains constant and one
end of the hose moves parallel to the other end.
TRAVELING LOOP, CLASS B LOOP
A condition wherein a hose is installed in a U-shaped
confguration and the ends move perpendicular to each
other so as to enlarge or decrease the width of the loop.
TORQUE (TORSION)
A force that produces, or tends to produce, rotation of or
torsion about the longitudinal axis of a hose assembly while the
other end is fxed.
VACUUM
Negative pressure or suction.
VELOCITY
The speed at which the medium fows through the hose.
VELOCITY RESONANCE
The vibration of convolutions due to the buffeting of a high-
velocity gas or liquid fow.
VIBRATION
Low-amplitude motion occurring at high frequency.
WELDING
The process of localized joining of two or more metallic compo-
nents by means of heating their surfaces to a state of fusion, or
by fusion with the use of additional fller material.
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