钢衬塑管道标准翻译1-7? 5.2 flange construction: 5.2.1 threaded flanges shall be secured in position to prevent inadvertent turning of the flange 5.2.2 socked-type flanges ,except threaded,shall be fully bach-welded to the pipe housing and the inside of the socket flanges shall be ground smooth. 5.2.3 slip-on flanges shall be fully back-welded 注:红色部分为重点 查看更多