Regarding the selection of weld evaluation methods
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The manhole flange is of the SO type; for the part where the diameter increases and the area where it is welded to the short section, which welding procedure qualification should be used? If a butt weld procedure qualification is chosen, are there any thickness requirements for that? Can an angle weld procedure qualification be used instead?
Is it necessary to use a 38-thickness plate for covering?
Butt welding evaluation is selected; no thickness requirement is applicable
Using butt evaluation will suffice, but it depends on whether there is a groove on the back side of your SO flange; if so, you still need to consider the thickness coverage range for the evaluation.
If it is in accordance with national standards, there is usually a bevel on the back side of the flange; butt welding is used for evaluation, with the thicknesses of both the pipe fitting and the flange being taken into account