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Nubbin on a Body Flange

Nubbin on a Body Flange

Nubbin on a Body Flange

What drives the requirement for a Nubbin on a Heat Exchanger Shell Flange?

RE: Nubbin on a Body Flange

I think this is an old detail that is no longer in common use. Every customer for which we are providing replacement equipment is asking that we remove the nubbin. Gasket technology has changed...

RE: Nubbin on a Body Flange

1) Gasket type. Solid metal gaskets (seldom used now) generally require nubbins in order to properly seat the gasket.

2) Cost. Per Appendix 2 of ASME Section VIII Div. 1, machining a nubbin onto the flange gasket surface usually reduces the required bolting area so that fewer (or smaller diameter) bolts can be used.

Personally I'd recommend against using nubbins if you have a choice.


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