PURPOSE: To resist heat by providing a self-protective function such as to protect a hose by leaking water only in a part heated from outside without changing a basic structure of a weight-reduced hose.
CONSTITUTION: In a weight-reduced hose where a watertight layer 2 is formed on an inside surface of a jacket 1 whose warp 4 and weft 5 are woven in a cylindrical shape, heat resistant work 3 is applied to the jacket 1, and the watertight layer 2 is formed of thermoplastic resin to be softened by heat transmitted through the jacket 1. Particularly, a softening degree by heat of the watertight layer 2 and a degree of the heat resistant work 3 of the jacket 1 are combined with each other so that the watertight layer 2 is broken without rupturing the hose when a heat resistant test is performed and water leaks from a surface of the jacket 1 and rupture pressure of the hose after this heat resistant test becomes equal to or higher than design working pressure when the heat resistant test by an A type fire model is performed in a condition where water pressure of 3kg/cm2 is applied to the hose, and proper water leakage is made obtainable only in a part with which a combustion material contacts among the hose.
KUSUMOTO KOJI
HONMA TAKESHI
