Piping work: 铺管工程Steam trace: 加热蒸汽管道Cutting: 切割socket weld承插焊接fillet weld角焊,填角焊branch connection分支接续fabrication tolerance.制造容差local heat treatment 局部热处理threaded pipe螺纹管seal welding.密封焊接flange joint 凸缘

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