Metal to metal flanges
Metal to metal flanges
(OP)
How to calculate the seating loads in case of a direct metal to metal flanges?
I have a rectangular flat face flange with a rectangular flat face blind. There is no gasket in between the flanges. I am trying to calculate the total bolting loads.
Thanks for the help!
I have a rectangular flat face flange with a rectangular flat face blind. There is no gasket in between the flanges. I am trying to calculate the total bolting loads.
Thanks for the help!





RE: Metal to metal flanges
If there is no sealing required between flanges, what seating loads would you like to calculate? Do you intend to keep some pressure inside or are there ather mechanical loads on the flanged joint?
Are you trying to size a square flange with a bolted cover, but no pressure to contain?
Try to give as many as possible details of what you are trying to do, so you can get a meaningful answer.
Cheers,
gr2vessels
RE: Metal to metal flanges
There won't be a gasket in between the flange and the blind. My surface finish is 16 micro inch.
I have calculated the static load based on the fluid design pressure.
I wonder how to calculate the seating load as I don't have a gasket. Since I have metal to metal contact should I treat it like I have a metal gasket and used the "Y" value of that ?
Thanks.
RE: Metal to metal flanges
Hope this helps.
Adam Potter MEng CEng MIMechE
www.ax-ea.co.uk
RE: Metal to metal flanges
If you are trying to achieve a metal-to-metal seal you will have to get the flange material to yield, y = at least the yield point of the flange material, m reflects your confidence in maintaining a seal at operating conditons. Confident = low m, not confident = high m.
Regards,
Mike
RE: Metal to metal flanges
As stated above, it will not seal !!
RE: Metal to metal flanges
The existing design came with gasket, operating condition changed so we have to design a new rectangular blind flange.
The liquid is very viscous, so hopefully it won't leak.
RE: Metal to metal flanges
it is a 12" x 2.5" rectangular flat flange with 2 x 10mm holes in the middle.
The blind cover will only see the design pressure through the 2 x 10mm holes.
it is a bit of a unique design.
RE: Metal to metal flanges
So it doesn't need to seal then?
Why not refine the design and add a o-ring groove? You can get it made to suit the rectangle. Then you wont need to worry about seating stress. It will make things a lot less problematic. Even a flexible graphite sheet would be better..
RE: Metal to metal flanges
RE: Metal to metal flanges
yup, most probably a silicone sealant. They are sometimes used on compressors...
http://
KN25,
The only way to analyze your rectangular flange is by FEA.
RE: Metal to metal flanges
i only have 2 m16 bolts to keep the flage tight, and they fail when it comes to seatign loads.