Careful consideration must be taken on the working conditions of Chemical Hose. If the assembly is constantly flexing, surging, or in a bent application, it could change the capabilities of the assembly. Bend guard, vacuum spring wires and armor guard protectors can be installed in some applications that will prolong the life of the hose assembly. Certainly media is a big factor in which product should be used. One factor to consider is: Permeation: Media that will diffuse through the liner wall and attack the exterior of the hose.

Technical Information

Related Working Pressure: Maximum operating pressure at which the hose may operate through the stated bending range.

Proof Test Pressure: Not to exceed 1-1/2 times rated working pressure. Chlorine Transfer Hose proof test pressure is 2 times rated working pressure.

Burt Pressure: The average pressure at which the hose can be expected to fail at 70°F.

Minimum Bend Radius: The bend radius to which a hose may be bent when no further motion is to be imposed.

Dynamic Bend Radius: The bend radius used in calculation involving applications where the hose is moving. The bend radius has a direct relation to cycle life. Bending the hose in a smaller radius than rated will adversely affect the life of the hose.

Live Length: The length of hose that will bend, or the length of hose between the braid collars (LL).

Overall Length: The total face-to-face length of a straight hose (OAL).
Length Tolerances:
Min.-18" assemblies: +/- .250"
19"-36" assemblies: +/- .500"
37"-50" assemblies: +/- .750"
51"-Max. assemblies: +/- 1.5%

Motion Calculations

Axial Motion: Motion that occurs when a hose is compressed along its longitudinal axis. Axial motion is only applicable in very short lengths of annular hose only. Plastic lined hose should not be subjected to axial motion.

Note: Where offset motion "Y" occurs on both sides of hose centerline, the hose live length should be based on total travel, or 2Y. The modified calculation will be: