Page 32 - CorrugatedCatalog110913Rev8LR

Definitions
ABRASION
External damage to a hose assembly caused by its being
rubbed on a foreign object.
AMBIENT/ATMOSPHERIC CONDITIONS
The surrounding conditions, such as temperature, pressure, and
corrosion, to which a hose assembly is exposed.
ANGULAR DEFLECTION
The displacement that occurs when an assembly is bent into a
single curve, expressed as an angle.
ANNULAR
Refers to the convolutions on a hose that are a series of com-
plete circles or rings located at right angles to the longitudinal
axis of the hose (sometimes referred to as “bellows”).
APPLICATION
The service conditions that determine how a metal hose
assembly will be used.
ARMOR GUARD OR CASING
Flexible interlocked or squarelocked tubing placed over the
entire length of a hose or in short lengths at the end of a metal
hose, to protect it from physical damage and to limit the bend-
ing radius.
ATTACHMENT
The method of fxing end fttings to fexible metal hose, i.e.,
welding, brazing, soldering, swaging, bonding, or mechanical.
AXIAL MOVEMENT
Compression or elongation along the longitudinal axis.
BEAMED BRAID
Braid construction where the strands of wire in each carrier
are parallel.
BEND RADIUS
The radius of a bend measured to the hose centerline, as
recommended by the manufacturer.
BEND RADIUS, DYNAMIC
The radius at which constant or continuous fexing occurs.
BEND RADIUS, MINIMUM
The smallest radius at which a hose can be used.
BEND RADIUS, STATIC
The smallest fxed radius to which a hose can be subjected.
BRAID
A fexible wire sheath surrounding a metal hose that prevents
the hose from elongation due to internal pressure. Braid is
composed of a number of wires wrapped helically around the
hose while at the same time going under and over each other in
a basket weave fashion.
BRAID SLEEVE/RING/FERRULE/COLLAR
A ring made from tube or metal strip placed over the ends of a
braided hose to contain the braid wires for attachment of ftting
and ferrule, and to immobilize heat-affected corrugations.
BRAID WEAR
Motion between the braid and corrugated hose which
normally causes wear on the outside diameter of the
corrugation and the inside diameter of the braid.
BRAIDED BRAID
In this braid, the strands of wire on each carrier of the braiding
machine are braided together, and then braided in normal fash-
ion, hence the term “braided braid”.
BRAZING
A process of joining metals using a non-ferrous fller metal with
a melting point that is lower than the “parent metals” to be
joined.
BUTT WELD
A process in which the edges or ends of metal sections are
butted together and joined by welding.
CASING (See ARMOR)
CONTROLLED FLEXING
Occurs when the hose is being fexed regularly, as in the case
of connections to moving components. Examples: platen
presses and thermal growth in pipe work.
CONVOLUTION/CORRUGATION
The annular or helical fexing member in corrugated or
stripwound hose.
CORROSION
The chemical or electro-chemical attack of a media upon a
hose assembly.
CYCLE LIFE
The number of cycles completed by an assembly before
failure.
CYCLE-MOTION
The movement from normal to extreme position and return.
DEVELOPED LENGTH/OVERALL LENGTH
The length of a hose plus fttings required to meet the
conditions of a specifc application.
DOG-LEG ASSEMBLY
Two hose assemblies joined by a common elbow.
DUPLEX ASSEMBLY
An assembly consisting of two hose assemblies - one inside
the other, and connected at the ends. Also known as
“jacketed assemblies.”
EROSION
The wearing away of the inside or outside convolutions of a
hose caused by the fow of the media conveyed, such as wet
steam, abrasive particles, etc.
FATIGUE FAILURE
Failure of the metal structure associated with/due to the
fexing of metal hose or bellows.
FERRULE (See BRAID SLEEVE)
FITTING/COUPLING
A loose term applied to the nipple, fange, union, etc.,
attached to the end of a metal hose.
FLOW RATE
Pertains to a volume of media being conveyed in a given time
period, e.g., cubic feet per hour, pounds per second, gallons
per minute, etc.
FREQUENCY
The rate of vibration or fexure of a hose in a given time period,
e.g. cycles per second (CPS), cycles per minute (CPM), cycles
per day (CPD).
HELICAL
Used to describe a type of corrugated hose having one con-
tinuous convolution resembling a screw thread.
HELICAL WIRE ARMOR/SPRING GUARD
To provide additional protection against abrasion. Metal
hoses can be supplied with an external round or oval section
wire spiral.
INSIDE DIAMETER (I.D.)
The diameter inside the hose corrugation.
INTERLOCKED/SQUARELOCKED HOSE
Formed from profled strip and wound into fexible metal
tubing with no subsequent welding, brazing, or soldering.
May be made pressure-tight by winding in strands of packing.
Refer to Stripwound catalog.
LAP WELD (LW)
Type of weld in which the ends or edges of the metal overlap
each other.
LATERAL OFFSET
The perpendicular distance between parallel ftting axes of an
assembly.
LINER
31