Glossary

A

Anchor – a restraint that is applied to eliminate motion and to restrain forces.

Annular – refers to the convolutions on a hose which are a series of complete circles or rings located at right angles to the longitudinal axis of the hose – also referred to as ‘bellows’.

Assembly – refers to any hose that is coupled with end fittings of any style, attached to one or both ends.

Attachment – using a tool to connect two separate objects.

B

Backing – soft rubber layer between a hose tube and/or cover and carcass to provide adhesion.

Body Wire – normally a round or flat wire helix embedded in the hose wall to increase strength or to resist collapse.

Bore – internal cylindrical passageway, as of a tube, hose or pipe; internal diameter of a tube, hose, or pipe.

C

Checking – short, shallow cracks on the surface of a rubber product resulting from damaging action of environmental conditions.

Clamp – a connector becomes a hose and a fitting.

Core – inner portion of a hose, usually referring to the material in contact with the medium.

Coupling – an alternative term for ‘fitting’.

D

Deduct Length – amount of fitting length deducted from a hose to result in the desired finished assembly length.

Displacement – amount of motion applied to a hose defined as inches for parallel offset and degrees for angular misalignment.

Duplex Assembly – an assembly consisting of two hose assemblies; one inside the other and connected at the ends. Also known as ‘jacketed assemblies’.

Durometer Hardness – a numerical value that indicates the resistance to indentation of the blunt indentor of the durometer.

E

Eccentric Wall – a wall of varying thickness.

Elongation – increase in length that is expressed numerically as a percentage of  the initial length.

Enlarged End – an end that has a bore diameter greater than that of the main body of the hose, in order to accommodate a larger fitting.

F

Fabricator – the producer of hose assemblies.

Free Length – the lineal measurement of hose between fittings and couplings.

Frequency – rate of vibration or flexure in a given time period.

G

Guide – a supporting device for a pipe in all directions.

H

Hoop Strength – the relative measure of a hose’s resistance to collapse of the diameter perpendicular to the hose axis.

Helium Testing – helium is used for the majority of high sensitivity leak testing applications.

Hose – the flexible conduit that consists of a tube, reinforcement and usually an outer cover.

Hydrostatic Testing – a procedure where a hose assembly is filled with water and taken to a pre-specified test pressure. The hose is monitored and inspected to ensure the pressure is held and integrity maintained.

I

Impulse – application of force in a manner to produce sudden strain or motion, such as hydraulic pressure applied in a hose.

Innercore – the innermost layer of a hose; the hose material in contact with the medium.

ISO – International Organisation of Standardisation.

J

Jacket – a seamless tubular braided or woven ply that is generally on the outside of the hose.

L

Life Test – a laboratory procedure used to determine the resistance of a hose to a specific set of destructive forces or conditions.

Liner – Flexible sleeve used to line the inside diameter of the hose when conveying a high velocity media, that also prevents erosion.

M

Mean Diameter – the midpoint between the inside diameter and the outside of a corrugated/convoluted hose.

Mender – a fitting or device used to join two sections of a hose together.

N

Necking Down – a localised decrease in the cross-sectional area of a hose resulting from tension.

Nomograph – a chart used to compare hose size to flow rate to recommend velocity.

O

Overall Length – total length of a hose assembly, consisting of the free hose length plus length of the coupling(s).

P

Performance Test – a test where the product is used under actual service conditions.

Ply – individual layer in hose construction.

Pressure, gauge – relative pressure between the inside and outside of an assembly.

R

Random Motion – uncontrollable motion of a metal hose, which can occur in manual handling.

Reinforcement – strengthening members consisting of either fabric, cord, or metal of a hose.

S

Smooth Bore – term used to describe the type of inner-core in a hose.

Soft End – hose end where the rigid reinforcement of the body, usually wire, is omitted.

Splice – a fitting or device used to join two sections of hose.

T

Tear Resistance – property of a rubber tube or cover of a hose to resist tearing forces.

Tube – the innermost continuous all-rubber or plastic element of a hose.