Preformed directly buried steam insulating pipes and fittings for urban heating
城镇供热预制直埋蒸汽保温管及管路附件
中华人民共和国住房和城乡建设部
本标准规定了城镇供热预制直埋蒸汽保温管（以下简称保温管）和管路附件的术语和定义、一般要求、要求、试验方法、检验规则、标志、运输和贮存。
本标准适用于输送蒸汽介质工作压力小于或等于2.5 MPa，温度小于或等于350 ℃的直接埋地钢制外护蒸汽保温管和管路附件的制造和检验。
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