Prefabricated directly buried insulating pipes and fittings with polyurethane [PUR]foamed-plastics and high density polyethylene [PE]casing pipes
全国城镇供热标准化技术委员会(SAC/TC 455)
本标准规定了由高密度聚乙烯外护管（以下简称外护管）、硬质聚氨酯泡沫塑料保温层（以下简称保温层）、工作钢管或钢制管件组成的预制直埋保温管（以下简称保温管）及其保温管件和保温接头的产品结构、要求、试验方法、检验规则及标识、运输与贮存等。
本标准适用于输送介质温度（长期运行温度）不高于120 ℃，偶然峰值温度不高于140 ℃的预制直埋保温管、保温管件及保温接头的制造与检验。
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