Definitions

Rated 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.

Burst Pressure:  The 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 calculations involving applications where the hose is moving. This 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).

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.

Offset Motion:  Motion that occurs when one end of the hose is deflected in a plane perpendicular to its longitudinal axis with the ends remaining parallel. In offset applications where motion is repeated, the offset should never exceed 25% of the minimum bend radius. To calculate the required live length to achieve a desired offset, use the following calculation: LL=(6YR + Y2)1/2 LL = Hose live length, inches R = Min. Bend Radius, inches Y = Offset, inches OAL = LL + collar length + (2 x dia.)

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: LL=(12YR + (2Y)2).5