Dear

I have some problem about the flange leakage after pre-commissioning.
The rating of flange is 1500#, the size is 20", material is SUS 347 and use ring-joint gasket.
During hydrotest and pre-comming, there was no problem. But during re-start after pre-commissioning, the leakage was occured.

Gasket problem? Or Bolt? I don't have any idea.

Are there any members who have that kind of experience?

Please help me.