HEAT PIPE LINE Russian patent published in 2001 - IPC

FIELD: pipe lines used in heat-power engineering for transportation of heat-transfer agent, for example, hot water or steam from source of heat to consumer and vice versa. SUBSTANCE: heat pipe line includes heat- insulated waterproofing return pipe line and supply pipe line laid inside it; supply pipe line is made from nonmetallic low- heat-conducting material and is provided with return and supply pipe lines made from coaxial lengths; spiral flexible pipe line filled with inert gas is laid inside heat-insulated waterproofing layer; at the beginning of lengths of return pipe line cycloidal spiral-shaped conductors are provided within butt joint. EFFECT: reduction of heat losses; reduced power requirements for transportation of heat-transfer agent. 3 dwg