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Metal Hose Terminology

The annular hose profile is designed so that each convolution is a complete ring or circle.

Woven wire sheath placed over hose which prevents elongation of the hose under internal pressure.

Close Pitch:
Less spacing between the corrugations or more corrugations per foot, thereby giving longest fatigue life and minimum bend radius.

Open Pitch:
Fewer corrugations per foot which limits motions and bend radius Applications – Diesel Engine Exhaust.

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

Intermittent Motion:
Motion that occurs on a regular or irregular cyclic basis along a path of full travel.

Parts attached to the ends of metal hose so that it can be connected to other components.  Examples of fittings: flanges, unions, nipples, or stub ends.

Flow Velocity:
When the flow Velocity exceeds 50 ft/second liquid, 100 ft/second gas in unbraided hose, or 75 ft/second liquid, 150 ft/second gas in braided hose, a flexible metal interlocked liner should be used.

Maximum Test Pressure:
Maximum test hose assembly should be subject to for testing purposes.  Based on 150% of the Maximum Working Pressure.

Material conveyed by a hose assembly such as chemicals, gases, or liquids.

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

American Standard Tapered Pipe Thread

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

Pounds per square inch gage.

Rated Burst Pressure:
Pressure at which hose can be expected to fail. Burst pressures in this catalog were obtained with the hose installed straight at 70°F and subjected to constantly increasing pressure.  Braid will normally fail under tensile load.

Random Motion:
Uncontrollable motion that occurs from manual handling of hose.

Safety Factor:
Difference between working pressure and rated burst pressure.

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

Rapid application of motion.

Shock or Pulsating Pressure:
Shock, pulsating or surge pressure which can cause premature failure of hose.  The maximum allowable pressure should not exceed 50% of the Maximum Working Pressure.

Working Temperature:
Temperature which hose is subjected to during operation.

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