Terminology
Annular
The annular hose profile is designed so that each convolution is a complete ring or circle.
Braid
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.
Fittings
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.
Media
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.
NPT
American Standard Tapered Pipe Thread
Operating Conditions
Temperature, Pressure, Media, Motion, and Application involved.
PSIG
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.
Vibration
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.
