标准号:NFE39-017-2-2015
英文标准名称:Districtheatingpipes-Preinsulatedbondedtwinpipesystemsfordirectlyburiedhotwaternetworks-Part2:fittingandvalveassemblyofsteelservicepipes,polyurethanethermalinsulationandoutercasingofpolyethylene
国际标准分类号:23.040.07
23.040.10
77.140.75
91.140.10