For fixed-tube-sheet heat exchangers, as for how to inspect the final circumferential weld, you can take a look at this diagram
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Someone asked: For fixed-tube-sheet heat exchangers, what about the final circumferential weld between the tube sheet and the shell? It seems that it’s really not possible to do an RT test, right? Generally, an RT test is not performed; if it is required, you can refer to the diagram below.
For heat exchangers with a large diameter, this is acceptable; but what if the diameter is small? Generally, when it is required that the welds between the tube sheet and the shell be inspected, corner welds are not used instead – forged tube sheets are employed, with butt welds used to create short connections at the edge where the tube sheet meets the shell
I think what was said on the second floor makes sense; if RT is needed, it’s better to go with circumferential welds.
I don’t think this is a good idea. When it’s placed in the tube holes, the rays have to pass through N tubes before reaching the outer shell, and the path taken through the heat exchange tubes is irregular; as a result, the image on the film is likely to be unclear: lol
It means that it’s best for the last ring seam to have all the tubes properly inserted, which is why the source is placed in one of the heat exchange tubes in the middle. In this way, many tubes are penetrated by the rays, and the cross-section is irregular :lol