Well said Bob. I've been watching many webinars also from Mr. Tony Paulin. I've learned a lot from them. The degree of confidence of engineer will become high in designing reliable piping systems (such as those systems subjected to cyclic loading). But of course, the best way is to have a solid foundation on where this concepts come from, not just inputting and reading output from software. As we know, FEA is an approximation technique. Therefore, it is still up to the engineer to validate his results like doing convergence study.

Any other opinion is highly appreciated.

Cheers!!!