Hello Anindya,

PVRC is working on newer flange design rules for some years now. When released it will probably be appendix BFJ in the code. As far as I know, some issues are in the process of being worked out.

In this method you select the tightness class, which have different leak rates. The gasket parameters are also different. Wmo is required operating bolt load that is computed in this method.

Can you ask your client to provide a copy of the draft of this appendix?