Hi all:

For flanged piping systems eg: Teflon-lined / glass-lined piping, how critical is modeling the flange thickness. The isos don't consider the flange thicknesses & dimension to C/L of the gasket. I am following dimensions exactly as indicated on isos.

So for the flange, I give it a thickness = gasket thickness with a rigid weight. Is this correct? How critical is the flange thickness in stresses / restraint loads etc. ?

The concern is if I model the flange thickness I have to make up the difference in pipe lengths indicated on the isos. So in that case my model wont match the isos and it's a lot of extra work.

Perhaps this is critical in a large bore piping? NPS>6" ?

Please advise. Also all flanges are rotating lap-joint flanges

Thank you kindly