Metal Hose Terminology

Annular
A hose profile that is designed so each convolution is a separate circle or ring.

Braid
Woven wire cover placed over hose which prevents elongation of the hose and permits higher working pressure.

Close Pitch
More corrugations per foot, which renders the longest fatigue life and minimum bend radius.

Constant Flexing Bend Radius
The minimum radius to which a hose can be repeatedly bent and render satisfactory flexure life.

Constant Motion
Motion that occurs on a regular cyclic basis at a constant travel.

Fittings
Parts attached to the ends of metal hose so that it can be connected to other components. Such as flanges, unions, nipples, etc.

Flow Velocity
When the flow velocity exceeds 75 ft./ second liquid, 150ft. / second gas in braided hose, a flexible metal liner should be used.

Intermittent Motion
Motion that occurs on a regular or irregular cyclic basis.

Maximum Test Pressure
Maximum pressure hose assemble should be subject to for testing purposes. Based on 150% of the Maximum Working Pressure.

Media
Conveyant in a hose assembly such as gases, liquids, etc.

Operating Conditions
Temperature, Pressure, Media, Motion and Application involved

Random Motion
Uncontrolled motion that occurs usually from manual handling of hose.

Rated Burst Pressure
Pressure at which hose can be expected to fail. Braid will normally fail before core burst.

Safety Factor
Difference between working pressure and rated burst pressure.

Shock or Pulsating Pressure
Sock, pulsating or surge pressure can cause premature failure of hose.

Static Bend
Minimum center bend radius to which flexible metal hose may be bent for installation.

Vibration
High frequency, low amplitude motion.

Working Temperature
Temperature to which hose will be subjected during operation.