选择合适的管道组成件；
由于历史、技术、管理上的原因，在用热网管道可能存在设计、施工、管道组成件等方面的问题。
The heat system may have the problem of design, construction and the pipeline work due to history, technology and management.
管道管件应为非扩口压缩式三件构造，由套圈、螺帽和本体组成，适宜安装在不锈钢管道上。
Tube fittings shall be flare less compression type of three-piece construction consisting of ferrule nut and body suitable for use on ss tubes.
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