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Flange Insulating Gaskets

Flange Insulating Gaskets

Flange Insulating Gaskets

(OP)
We have just purchased insulating type flange gaskets and are concerned with over tightening the bolts.  On a past project with this same client two sets of gaskets were damaged using the bolt torques listed in the client's specifications for the applicable lubricant which we do not want to happen again.  Unfortunately, I do not know how much the field backed off from the client's values.

The gaskets are neoprene faced phenolic for 16" Class 600 flanges.

Does anyone have any guidelines for the min seating stress and max face stress that this type of gasket can stand?

I called the gasket manufacturer and got one of those "that information is not available" responses.  Does not seem plausible to me that the gasket manufacturer does not know but that is the case.  Must be a liability thing.

FYI, the client's specifications call for tensioning for 20" and larger flanges and torqueing for smaller flanges.

Thank you in advance.

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