ASME VIII DIV 1 Section Y: Flange Thickness Formulae
ASME VIII DIV 1 Section Y: Flange Thickness Formulae
(OP)
ASME Section VIII DIV 1 Appendix Y states that the rules apply to flat Face, Identical and Non-Identical Flange Pairs where uniform metal to metal contact occurs outside bolt circle. In addition, it states that rules apply for negligible gasket loads (ie. Pressure Energized O-ring Body Seal) HG=0. My question is if spiral wound gaskets are utilized for Body Sealing, do rules apply for using HG*hg in the formula for Flange Thickness Calculations?





RE: ASME VIII DIV 1 Section Y: Flange Thickness Formulae
RE: ASME VIII DIV 1 Section Y: Flange Thickness Formulae
RE: ASME VIII DIV 1 Section Y: Flange Thickness Formulae
Additionally, the sprial wound gasket is going to engage a gap between flange faces, and and gasket seating force is to give the leak tighness. Therefore you will loose the contact on the metal surfaces outside the bolt PCD. So your flange is going to act similar to the flanges which is calculated in accordance with Appx 2. Therefore Appx 2 still applies.
If you embed the gasket in a cavity in accordance with Appx Y you can not be sure the leak tightness is provided. I have not seen a supporting paper for this kind of application. I would like to see if there is one.
Please remember that the flange types and their applications have very large number of tests and papers behind. It was not decided in a day. Thereore the applications are limited. In case you can provide a reasonable calculation and this can be proven in certain number of application for some time, it may go into code. You never guess without trying. But your approach should be logical and considers all the requirements.
RE: ASME VIII DIV 1 Section Y: Flange Thickness Formulae
Regards,