1工程内容空调工程使用的压缩式制冷系统中工作压力低于2.0MPa、温度-20～150℃范围内、输送介质为制冷剂与润滑油的管道安装工程。2设备和材料质量要求(1)管子、管件、阀门具有出厂合格证明书,各项指标符合现行国家或部颁技术标准。(2)氨系统制冷剂管道及管件用无缝钢管。氟利昂制冷剂系统当管道直径大于或等于25mm时,用无缝钢管;当直径小于25mm时,用紫铜管。(3)管子、管件在使用前进行外观检查:无裂纹、缩孑L、夹渣、折叠、重皮等缺陷,无超过壁厚允许偏差的锈蚀或凹陷,螺纹密封面良好,精度及光洁度达到设计要求或制造标准。 1 project content Air conditioning works using compressed refrigeration system working pressure is lower than 2.0MPa, temperature -20 ~ 150 ℃ range, the transmission medium for the refrigerant and lubricants pipeline installation. 2 equipment and materials quality requirements (1) pipe, pipe fittings, valves with factory certificate, the indicators in line with the current national or ministerial-level technical standards. (2) ammonia system refrigerant pipes and fittings seamless steel pipe. Freon refrigerant system when the pipe diameter greater than or equal to 25mm, with seamless steel pipe; when the diameter is less than 25mm, with a copper tube. (3) Appearance inspection of pipes and fittings before use: no cracks, shrinkage L, defects such as slag inclusion, folding, heavy skins and the like, no rust or depression exceeding allowable deviation of wall thickness, good thread sealing surface, accuracy and finish Design requirements or manufacturing standards.