Gasket Calculation
Gasket Calculation
(OP)
Does anyone know of a calulation provided by ASME to check whether a Gasket is the correct size?
I am doing a calculation as per ASME Sec VIII app 2, and I noticed there is no true failure mode for the gasket. (really the flange MAWP increases to no end with a thinner gasket due to seating stress and area)
Obviously if this were the only reason for choosing a gasket size we would have extremely small gaskets to increase the MAWP so a calculation must exist for a required gasket Od and ID.
Does anyone know of anything?
I am doing a calculation as per ASME Sec VIII app 2, and I noticed there is no true failure mode for the gasket. (really the flange MAWP increases to no end with a thinner gasket due to seating stress and area)
Obviously if this were the only reason for choosing a gasket size we would have extremely small gaskets to increase the MAWP so a calculation must exist for a required gasket Od and ID.
Does anyone know of anything?





RE: Gasket Calculation
Nmin = Ab*Sa/(2*pi*G*y), nomenclature per Apx 2.
Checks against exceeding gasket seating stress, y.
Probably better is to find out the appllied stress recommended by the gasket manufacturer and size the gasket accordingly.
Regards,
Mike
RE: Gasket Calculation
RE: Gasket Calculation
Nothing on thickness as far as I know.
Regards,
Mike
RE: Gasket Calculation
RE: Gasket Calculation
It seems to me earlier versions of Codecalc did perform it, but the calculation was discontinued when Table 2.4 was introduced.
To expand on what I said earlier, the best way to size a gasket is to find out from the manufacturer the recommended applied stress, usually based on the actual gasket area (no b, bo) and the targeted actual bolt stress rather than design stress Sa / So.
Regards,
Mike