How are the socket-welded branch pipe bases welded to the main pipe, and how are the pipes opened?
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1. What is the size of the opening in the main pipe? If the branch pipe connection fitting is DN20 and the main pipe is DN80, what size should the opening in the main pipe be? Is it necessary to create a bevel on the main pipe? 2. How should welding be carried out? Should the branch pipe connection fitting be inserted into the main pipe? 3. Should the opening in the main pipe be larger than that in the branch pipe connection fitting, with the latter being inserted into the former?
The main pipe should have an inner diameter identical to that of the connection point with the branch pipe. . . . saddle seat
How is pipe flange weld inspection carried out?