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Flange Finsh
3

Flange Finsh

Flange Finsh

(OP)
Hi Guys,

Just being bussy specifying the flange finish for and ANSI B16.5 raised face flange for a ejector mixer. We are using graphite envelope gaskets with stainless steel insert. I can specify serrated spiral or concentric grooves in the raised face surface. Which type of grooves do I speciffy when ??

Thanks for any reply

Chris0164

Kind Regard,

Chris

RE: Flange Finsh

Chris0164, why don't you just let the finish in ASME B16.5 (not ANSI any longer) govern? Spiral grooves would be preferred I would expect.

Regards,

Mike

RE: Flange Finsh

I agree with the B16.5 approach (paragraphs 6.4.5.x). But in my experience, concentric grooves are preferred, the argument being that spiral grooves provide a leak path. Can't say that I completely buy the argument, but haven't found a reason to get excited about it.

jt

RE: Flange Finsh

IF the clamping pressure is high enough to force the  gasket material to conform, and IF the flanges are thick enough, and IF he bolt spacing is tight enough, then a spiral groove on the flange face whose dimensions don't violate the surface finish specs, won't allow a leak.

Similarly, at least in my mind, Most lip seal manufacturers specify a plunge ground sealing surface (creating pure circumferential grooves, not helixes)  in addition to a surface finish when leaks must be minimized.

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