High-density low-pressure polyethylene outer sheath of polyurethane foam buried pipe insulation: HDPE outer sheath of polyurethane buried pipe insulation overview saving buried pipe insulation from the pipe, coating, insulation, corrosion protection layer compression, if it is over heat pipe, then in the middle of the insulation layer and the coating together with a cooling layer. These pipes have less heat loss compressive strength properties, good water corrosion performance. Life in general in the 40 - 50 years. Compared with the traditional trench laying pipe, with good insulation properties, construction and installation of simple small footprint, low construction cost, short construction period, etc., particularly in energy efficiency, with the present situation, it is a difficult any pipe insulation match, according to energy-saving technology service center in Tianjin test report: In the burial depth of about one meter of pipeline, every 100 meters to cool to 0.1 ℃, each 100 m long heat loss rate of 2.07%, in general, the next kilometer pipe insulation, the annual savings of 10.4 tons of standard coal province. "Pipe-in-pipe" two pipe insulation, polyurethane buried pipe insulation material compared with other insulation materials and insulation performance of rigid polyurethane foam plastic is a good performance of thermal insulation material, the cell was closed cell structure, closed cell of gas (Freon F11) Thermal conductivity (0.007W / mK) is extremely small, and therefore, heat insulation properties of polyurethane buried pipe insulation material is lower than almost all the other insulation materials, it is compared with other insulation materials, to achieve the same insulation , insulation thickness can be reduced 30-80%. High-density low-pressure polyethylene (HDPE) outer sheath polyurethane buried pipe insulation Overview HDPE outer sheath polyurethane buried pipe insulation energy-buried pipe insulation outlined by the steel pipe, coating, insulation, corrosion protection layer compression, if it is ultra-high temperature pipe insulation in the middle layer and the coating together with a cooling layer. These pipes have less heat loss compressive strength properties, good water corrosion performance. Life in general in the 40 - 50 years or so. Compared with the traditional trench laying pipe, with good insulation properties, construction and installation of simple small footprint, low construction cost, short construction period, etc., particularly in energy efficiency, with the present situation, it is a difficult any pipe insulation match, the burial depth of about one meter of pipeline, every 100 meters to cool to 0.1 ℃, each 100 m long heat loss rate of 2.07%, the next kilometer pipe insulation in general, the annual savings of the provincial coal 10.4 tons.