Work pipe + polyurethane rigid foam + high density polyethylene external protection pipe

In the heating industry, the demand of steam pipeline is increasing in recent years. With the increasingly standardization of urban construction, beautifying the city has become an inevitable development. The original overhead laying and pipe trench laying methods are gradually replaced by direct burial technology.

Working steel pipe + aluminum silicate felt + calcium silicate inorganic layer + high temperature resistant and flame retardant aluminum foil reflective layer + rigid polyurethane organic insulation layer + outer steel pipe + external anti-corrosion layer

At present, the operating pressure and temperature of secondary heating pipe network in China are basically below 0.8MPa and 85 ℃. Considering the corrosion, connection and cost of steel pipe and the suitability of plastic pipe, PE-RT II heat-resistant polyethylene pipe is used instead of steel pipe to prefabricate three in one hot water insulation composite pipe.