BS EN 488:2015 區域供暖管道.直埋式熱水供應網用預先隔熱包覆的管道系統.聚氨基甲酸乙酯熱絕緣和聚乙烯外覆層鋼管用鋼閥門組件
District heating pipes. Preinsulated bonded pipe systems for directly buried hot water networks. Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene