Multilayer fluid conduits

Through strong zinc outer surface and thermoplastic outer layer of the multiple hydraulic transmission pipe. The outer layer is made of the sleeve part of thermosplastic plastic pipe connector, strong of the connection end of multiple sleeve the leakage oil pipe. Around the fire protection system, preferably a metal is the steel, preferably a thermoplastic is CPVC; the preferably heating) and activation. The preheating cover bond's metal pipe, and thrust CPVC to the metal pipe of the surface. Through is anti-flaming CPVC, the invention's multiple water capable of the has a serious area, wherein compatibility relative the existing plastic pipeline, comprising a total CPVC water system. At the scene, direct and normal the plastic pipe is connected by cutting and is suitable connected by using the carrier, inside of the casing pipe of the water system.