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Calculates three different kinds of stresses acting on flat heads that have a large centrally located opening or nozzle whose inside diameter is greater than 1/2 of the outside diameter of the flat head. Geometries with or without an attached nozzle may be analyzed. This analysis module is based on the ASME Code Section VIII Division 1, Appendix 2 and Appendix 14.

For more information on flat head analysis, see Nozzles.

The first step in this process is to analyze the flange as a flat head and determine the total moment acting on the flange for the operating case. Since there is no gasket, the gasket seating case is neglected. The radial flange, tangential flange and longitudinal hub stresses are computed in accordance with Appendix 2. These three stresses, Sr*, St*, Sh* and some geometry constants are used to determine the actual radial, tangential, and longitudinal hub stresses. Two sets of stresses are calculated: one for the head/shell juncture, and the second for the opening head juncture. If all of the calculated stresses are below the allowable stresses, the geometry is considered satisfactory. If any stress is greater than it's allowable, the geometry must be reconsidered.