PN-EN 17415-1-2021-01 E 区域供冷管道 直埋冷水管网的粘合单管系统 第1部分:钢管或塑料供水管、聚氨酯隔热层和聚乙烯套管的工厂制造管组件
District cooling pipes -- Bonded single pipe systems for directly buried cold water networks -- Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal insulation and a casing of polyethylene