How to design BX gasket? 1

[Jerryhao]

I have a trouble when I design a high pressure flange.Becouse I don't know how to calculate size of type BX ring gasket.
I know the gasket design according to ASME Paper No. 63-PET-3 June 4, 1963 "design of high pressure integral and welding neck flanges with pressure energized ring joint gaskets (R. Eichenberg).
Who can help me?

Thanks
Jerry

 

[jbeckhou]

See API-6A for BX grooves and gaskets dims. Or just google api-6a BX gasket dimensions.

Petrotrim Services

http://www.petrotrim.com

 

[Jerryhao]

Thanks,but what I want is how to design a non-standard type bx ring gasket,just like high pressure valve bonnet gasket.

 

[gasketguru]

You will find that the only standard size BX ring that complies with the info in the paper you mention is a BX-161 - there was an earlier paper from 1957 which ties-up with the original 150 series rings. The formulae changed a little in the later 160 series rings, but the general approach is still basically along the same lines.

There is not room for me to explain it all here, but if you take the basic principles in that paper you will get the main idea, but the earlier paper will also help to explain it as well.

Essentially the section of the ring and the diameters of the ring and groove derive from the bore and pressure - they were originally made for 15k flanges and square in section, but some later ones for 10k and 5k are not square section.

 

[Jerryhao]

Thanks for you,gasketguru,Could you kindly tell me what's the "earlier paper from 1957",where can I get this paper?

 

[gasketguru]

All I can tell you is that it was another paper by Mr Eichenberg the title was "Design Considerations for AWHEM 15,000 psi Flanges", and it was written for an ASME Petroleum Conference in Tulsa in Sept. 1957.

Again for 150 series 15k rings the section is square, but other pressures are not necessarily square, and that the rings are of course an interference fit on groove O/D to give the initial stand-off between the flanges. Everything derives from the bore of the flange.

 

[gerhardl]

Some of the (at least European) advanced manufacturors and suppliers of ring sealings and gasket materials have gathered and will supply information on recommended sealing and groove and flange forms and material and sealing and gasket types related to flange norms and pressure clases and sizes/temperatures for different fluids above what is to be found as standards in different norms.

Try to search for suppliers to offshore/onshore petroleum and gas or power plants (including hydroelectrical) as probably some of the most demanding industries.