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This is an additional check is that is good practice to follow that came from the CODAP code paragraph C6.1.6(e) and (f):
Where:
Ab = Total cross-sectional area of bolts [n x ab (C6.1.3.1)]
Ab,min = Minimum required cross-sectional
fb,A = Nominal design stress of the bolts or studs for gasket seating condition (fb,A is the nominal design stress for a normal operating condition at atmospheric temperature)
w = Contact width of the gasket on the facing (see C6.1.5)
G = Diameter of the circle on which gasket compression load acts (see C6.1.5)
y = Gasket seating pressure (see C6.1.5)
If you do not want to do this gasket check you can check the box on the gasket tab: