MULTILAYER PIPE AND SYSTEM OF PIPES FOR WATER IN WATER AND HEAT SUPPLY SYSTEMS Russian patent published in 2004 - IPC

FIELD: district heating. SUBSTANCE: invention relates to multiplayer pipes for water, preferably, hot water, operating in heating networks or water lines. Proposed multiplayer pipe consists of body made of polymeric material, preferably, of cross-linked polyethylene, barrier layer to prevent diffusion of water through multiplayer pipe at high temperature of hot water is applied to pipe body. Said barrier layer consists f liquid crystal polymer. Invention relates also to hot water system including multiplayer pipe made of polymeric material, heat insulation enclosing the pipe and outer sheathing, multiplayer pipe being made of cross-linked polyethylene and liquid crystal polymer barrier layer. EFFECT: reduced heat losses in multiplayer pipes. 18 cl, 4 dwg