中国船舶工业总公司七二五所最近在为北京热力网工程提供波纹管招标中一举夺标。为了利用北京石景山发电厂的尾汽余热,需要敷设一条从石景山发电厂至钓鱼台和三里河,φ1.2米约35公里的热水管道,作为沿线住宅、工厂、机关的采暖。敷设这条管道需配备波纹管膨胀节 The 725th China National Shipbuilding Corporation recently won the bid for the bellows tender for Beijing Heating Network Project. In order to utilize the tail gas residual heat of the Beijing Shijingshan Power Plant, it is necessary to lay a hot water pipeline from Shijingshan Power Plant to Diaoyutai and Sanli River, φ1.2m and 35km as heating for houses, factories and institutions along the line. The laying of this pipe must be equipped with bellows expansion joints