I see. Got your point Mariog. I think better not to use the EP analysis from piping point of view. Actually, it's a quite complicated requirement also. And I think if you perform EP analysis, all other requirement such as ratcheting and fatigue must be EP analysis also to be consistent as there is also an approach to this in the code and when I read it's quite complicated and requires tedious task to perform. From design point of view a simple elastic analysis together with Code requirements is sufficient and proven approach based on years of experience.

Just correct me if I have got your point. But I agree that a consistent approach must be maintained so as not to cause confusion and we might miss something that we don't know if we mix the approach.

Cheers!!