EN 253:2009+A1:2013 地下热水网用预制隔热管道系统.聚氨酯热绝缘和高密度聚乙烯外皮隔热的供水钢管组件 包含修改件A1,2013
District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene