Technical specification of joint assembling for directly buried insulated pipeline of urban heating
全国城镇供热标准化技术委员会(SAC/TC 455)
本标准规定了城镇供热直埋管道接头保温的术语和定义、分类和适用条件、现场加工、要求、试验方法、检验规则、标志、运输和贮存。本标准适用于介质设计压力小于或等于2.5 MPa，介质温度小于或等于120 ℃，偶然峰值温度小于或等于140 ℃的预制直埋热水保温管(以下简称热水管)的接头保温及介质温度小于或等于350 ℃的钢外护管预制直埋蒸汽保温管(以下简称蒸汽管)的接头保温。
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