ASME Sec. VIII Div. 1 does not cover the design of flanges for which the gasket extends beyond the bolt circle diameter. Select this option to use a typical method for the design of these types of flanges is from the Taylor Forge Flange Design Bulletin.
Gaskets for the full face flanges are usually of soft materials such as rubber or an elastomer, so that the bolt stresses do not go too high during gasket seating. The software adjusts the flange analysis and the design formulae to account for the full face gasket. There are 3 Full Face Gasket Flanges options:
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Program Selects
Select to automatically make the determination if this is a full face gasket flange, depending upon the input. If the gasket ID and OD matches with Flange ID and OD dimensions respectively (except for a blind flange) then it is determined to be a full face flange. See the figure below.
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Full Face Gasket
Select if this is a full face gasket flange. Use this option when the gasket ID or OD does not match the flange ID/OD dimensions, but the gasket extends beyond the bolt circle diameter. See the figure below:
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Not a Full Face
Select if this is not a full face gasket flange.