Gasket issues 1

[ME231]

Hi All,
In working my way thru Appendix 2 I dont quite see any guidelines for restricting the hiegth of a gasket nubbet on something like a 1(c) type gasket arrangement. Is this not of concern to ASME? I would think they would worry about shearing of the little protrusion due to the internal pressure. Or maybe the gasket would blow away before this would happen!
Please advise. Thanks.

 

[SnTMan]

sp231, all the nubbins I have ever seen are the 1/64 in. high per Figs 2 & 3, for 1/8" thk gaskets. I personally consider the use of them a poor practice, except for a solid metal gasket. I usually design as if the nubbin were not there, even if furnished.

As to your question, I suppose if very tall you could check the cross section for shear due to pressure. I would think it would most likely exceed that of the gasket.

Regards,

Mike