I am designing a bolted blind flange on a very low pressure system (less than 20 psi) and I am using BPVC.VIII to determine the minimum thickness of the flange. I am using equation 1 because it will be a flat face flange with full face gasket, so there will be no edge moment. The formula is very simple, however I am not sure what value to use for the joint efficiency (E) because I cannot find values of E for bolted connections. It says to use table UW-12, but that only covers E values for welded connections. Does anyone know what E value I should use?
Thanks.
Thanks.