Analysis on application of prefabricated insulation polyethylene pipes to low temperature direct

 Combined with the problems and deficiencies in the application of the existed steel prefabricated insulation pipe to the direct buried heating pipe network, presents the advantages of prefabricated insulation polyethylene (PE-RTⅡ) pipe applied to direct buried heating pipes with working pressure not more than 1.0 MPa and design temperature not higher than 85 ℃, and expounds the status of application and research at home and abroad. Analyses the design points of PE-RTⅡ pipeline application to low temperature direct buried heating pipeline, including hydraulic calculation, pipe network layout and stress calculation.