Gasket particular shape - calculation

[Ehiman1]

Hello guys,
I have to calculate a bolted joint with two welding neck flanges against high pressure with a particular gasket that I never used.
This gasket has trapezoidal shape and I would like to know if it exists a calculation for this type of gasket.
Code is EN13445 and pressure is 280 barg with Carbon Steel material (heat exchanger)

 

[iangineer]

Could you expand any on what type of gasket it could be? Are the flanges raise faced?

For determining the moment on the flange caused by bolting from the gasket, I would measure from the middle of the narrower part of the gasket.

 

[SnTMan]

"trapezoidal shape" means what, exactly?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[BJI]

Sounds like a Lens gasket. For flange design, treating it as any other metal gasket would be suitable. Since you are working to EN13445 you might find referencing EN1591-1 helpful for the geometry.