Is the weld a Type B weld?
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Are the welds between the tube sheet and the shell in the diagram B-welds (for fixed tube sheet heat exchangers)? When 100% RT/UT is required, especially for stainless steel equipment, what kind of equipment is used for the non-destructive testing of B-welds? It seems that conventional equipment cannot be used to inspect such welds
It is a Class B welded joint; refer to Figure 4-1 in GB/T151
So how do you detect it? ? ? Neither UT nor PT tests can be done
If the last circumferential weld cannot be inspected, the joint coefficient is set to 0.6
For Class B welds, non-destructive testing is mandatory; there is no other way except to increase the length of the tube sheet side. :)
For groove B, no non-destructive testing is required for the TIG welding root pass: lol
For equipment that requires supervision and inspection, how can we convince the boiler inspection agency?
It is undoubtedly a Class B suture. If this gap meets the requirements of Article 10.3.4 of GB150.4, testing may be omitted.