标准号:NFEN253-2009
英文标准名称:Districtheatingpipes-Preinsulatedbondedpipesystemsfordirectlyburiedhotwaternetworks-Pipeassemblyofsteelservicepipe,polyurethanethermalinsulationandoutercasingofpolyethylene.
国际标准分类号:23.040.10
77.140.75
91.140.10
部分代替标准:NFEN253-1994