I don't necessarily disagree with your contention that this is a blunt and potentially highly-conservative (but also potentially under-conservative) approach.
Your ID says that you are from Italy - is that correct? If so, I would recommend that you get involved in the ASME Section VIII, Italy...
Correct. Cylinders would have single-curvature, but any head would be doubly-curved.
Yes
For Table 6.1, classification is strictly based on the fabrication method.
Apply a fitness-for-service approach, looking for specific damage mechanisms. And note that merely exceeding yield is not a damage mechanism. We're talking: crack, bulges, dents, gouges, other gross deformations, fatigue damage (somewhat related to cracks), etc. You might need to perform some...
These stresses are pseudo-elastic stresses. That means that they are stresses that exceed yield, based on an elastic analysis/calculation. In reality, the component will experience plastic deformation, that could have a plastic strain that could be on the order of the true ultimate plastic...
@MSL68 - you are correct that Section III, XIII-3120(b)'s use of the verb "may" is a permissive in the context that you state.
For additional clarity, VIII-2, 5.2.2.2(b)(1) removes the may and simply states that "a region of stress is considered as local if the distance...".
This locality...
FYI - in the 2025 Edition of VIII-1, Appendix 2 will be "removed", with reference to VIII-2 4.16. No new methods will be introduced in VIII-2 in the 2025 Edition. However, the SWG-BFJ is working on implementing alternative rules for the 2027 Edition (fingers crossed).
