Effective Gasket Width width for self-energized gasket.

[takio]

Hello,

I would like to ask some questions.
My gasket groove looks like as below. It's a confined groove facing flat bottom of upper flange.

In Table 2-5.2 Effective Gasket Width, I don't find any groove types that I have. The seal is self-energized metal c-gasket.
How can I find the effective seating width for this type?

Thank you!

 

[Compositepro]

In my book gaskets are not self-energizing (or at least do not rely on that for sealing). It would be a seal ring or square o-ring. Gaskets rely on compression for sealing and different principles apply. Perhaps this is why you cannot find the information.

 

[david339933]

Check out App. Y.

 

[takio]

Hello,

Thank you for the replies.

TO Compositepro
I am using one of self-energized seals in this catalog.

https://technetics.com/bin/Helicoflex.pdf

To david339933
Thank you so much for the information.
Could let me know if i can apply ASME SECTION VIII DIV APPENDIX2+ Blind flange UG-34 to this configuration in the drawing?

Thank you for your time.

 

[jnleroux]

In my opinion, the design you show with the gasket described would create no measureable moment between the gasket and the bolts. The closest Figure UG-34 design would be (p), which corresponds to a flat faced gasket that also has no edge moment loading.

This this in mind, the design thickness should be based on UG-34(c)(2)(1),
t = d(CP/SE)^0.5,
rather than UG-34(c)(2)(2),
t = d*((CP/SE + 1.9Whg/SEd^3)^0.5.

In this case, C would be equal to 0.25" and d would be equal to the bolt circle.

 

[david339933]

App. 2 is not intended for use where there is metal to metal contact outside the bolt circle.