Hi Michael,

Thanks for your opinion. That's true, it's hard to address all the possible scenarios that can exist in a piping system. Now I know why my senior stress engineer when I was still a junior stress engineer let us run a quick modal analysis to check if our piping system has enough guide and restraint. I think this is one of the reason to cater for those unknowns. But this check will only work fine for not so high temperature system because as we know thermal stress and dynamic stress has opposite solution. So it's not a mandatory requirement but rather a rule of thumb. That's why I have seen some high temperature systems experiencing vibration due to the fact that enough flexibility is required to qualify the system and dynamic stress is addressed as it happens in the field (since it's hard to address in design stage).


Any other opinion is greatly appreciated.

Cheers!!!!