• A

    Damage caused to the hose assembly, externally by being rubbed on another object or internally from the flow of media through the hose

    Ambient Conditions
    Surrounding conditions the hose assembly is exposed to such as pressure, temperature and corrosion

    Amplitude of Vibration or Lateral Movement
    The distance a hose moves to one side from its installed position

    Angular Offset
    Bending the hose so the ends are no longer parallel

    Annular Corrugation
    A series of rings or convulsions at right angle to the centre line of the hose

    Used to protect the hose and/or to limit bend radius

    The method used for attaching end fittings on to the hose, eg welding

    Axial Motion
    Compression or extension along the length of the hose (absorption of movement)

  • B

    Basket Weave Braid
    Wire Strands that are alternately crossed two over and two under

    Bend Radius
    The radius of a bend measured from the centre line

    Flexible wire that is weaved together to form a sleeve over the flexible hose, this is done to protect the hose from elongation when under internal pressure, a second layer of braid can be used for higher pressure assemblies

    Braid Angle
    The angle formed by the braid strands along the axis of the hose

    Braid Sleeve or Ferrule
    A metal ring that goes over the end of the hose and braid that end fittings can be attached to

    Braid Wear
    Friction between braid and hose which can cause wear

    Braided Braid
    Wire strands are firstly braided together

    Butt Weld
    A form of welding where the ends to be joined are butted up against each other and a joined by a weld

  • C

    Constant Flexing
    Continuous or regular movement, for example if the hose is connected to moving parts

    Chemical attack of media on a hose

    Annular or helical flexing member in corrugated hose

    Cycle Life
    How many cycles a hose can go through before it fails

    Cycle Motion
    The movement from neutral to extreme position and then back again

  • D

    Developed Length
    The overall length of the assembly including hose and end fittings required for a specific application

    Diamond Weave Braid
    Wire strands alternately crossed one over and one under

    Dye Penetrate Test
    A non destructive test used to check for surface imperfections such as cracks

    Dynamic Motion
    Non continuous controlled motion e.g. thermal expansion

  • E

    The wearing away of convolutions due to the flow of media
  • F

    Structural failure associated with flexing of the hose

    A metal ring that goes over the end of the hose and braid that end fittings can be attached to

    Flat Braid
    Has a braid angle greater than 45°

    Flow Rate
    Volume of media passing through the hose in a specific time e.g. gallons per minute

    Frequency of Vibration
    The rate of vibration or flexure of a hose in a specific time e.g. cycles per minute


  • H

    Helical Corrugation
    A convolution on a hose that is one continuous spiral

  • I

    Inside Diameter
    The distance measured at the closest point either side of the centreline of the hose

  • L

    Lap Weld
    A weld were the edges of the material overlap and are then welded together

    Lateral Offset
    Bending the hose so the ends are parallel

    A sleeve inserted into the hose to protect the corrugations of the hose from abrasion or used for high velocity media

    Live Length
    The section of the hose assembly which is able to flex

    Loop Installation
    An installation where the hose is installed in a loop or U shape, this often done where there is movement

  • M

    The substance that passes through the hose

    Minimum Bend Radius
    The smallest radius that a hose can be bent to without suffering permanent damage

  • N

    Nominal Diameter
    Approximate inside diameter


  • O

    Operating Conditions
    Conditions a hose assembly is subjected to such as temperature, pressure and movement

    Outside Diameter
    The distance measured at the furthest point either side of the centreline of the hose

  • P

    Permanent Bend/Static Bend
    A fixed radius bend in a hose assembly

    The distance between the peaks of the convolutions

    The number of layers metal used to construct the wall

    Pressure, Atmospheric
    The pressure of the atmosphere a sea level which is 14.7 PSI

    Pressure, Deformation
    The pressure that the convolutions of a hose become permanently deformed

    Pressure, Maximum Test
    The maximum pressure a hose should be subjected to for test purposes without permanently deforming the hose

    Pressure, Maximum Working
    The maximum pressure that the hose should work at on a day to day basis

    Pressure, Pulsating
    Rapid change in pressure above and below the normal base pressure

    Pressure, Shock
    A sudden increase of pressure that can cause a shockwave through the hose permanently damaging it

    Pressure, Static
    A constant pressure that does not change

    Pressure, Working
    Internal or external pressure imposed on a hose during normal operating conditions

    Pounds per square inch absolute

    Pounds per square inch gauge

  • R

    Radial Motion
    When a hose is bent in a 180° arc like what is used in vertical and horizontal traveling loops
    Random Motion
    Uncontrolled movement of a hose such as what occurs during manual handling
  • S

    Safety Factor
    The relationship between working pressure and burst pressure

    Refers to oxide or thin coating of media bought on by surface conditions or welding

    Refers to corrugated metal hose does not have a weld seam down the

    Hose failure where the hose is deformed into a S or U shape as a result of excessive internal pressure on un-braided hose where the ends or restrained, or un-braided hose where the hose has been axially compressed loosening the braid while the hose is pressurised

    Static Bend
    A fixed radius bend

    Steep Braid
    Braid with an angle of less than 45°

    Individual strands of wire that make up the braid

    Stress Corrosion
    A form of corrosion in stainless steel usually associated with chlorides

  • T

    Temperature Correction Factor
    Corrects the pressure rating in higher temperature applications
    A force that produces rotation along the longitudinal axis of a hose assembly where one end is fixed
  • V

    Negative pressure of suction
    Speed at which the media flows through the hose
    Velocity Resonance
    Vibrations of convolutions due to the buffeting of high velocity gas or air flow