标准编号：GB/T 29047-2012中文名称：高密度聚乙烯外护管硬质聚氨酯泡沫塑料预制直埋保温管及管件英文名称：Prefabricated directly buried insulating pipes and fittings with polyurethane [PUR]foamed-plastics and high density polyethylene [PE]casing pipes标准简介：本标准规定了由高密度聚乙烯外护管、硬质聚氨酯泡沫塑料保温层、工作钢管或钢制管件组成的预制直埋保温管及其保温管件和...