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Performs stress evaluations of Class 1, category 1, 2, or 3 flanges that form identical flange pairs. This module conforms to the latest version of the ASME Code Section VIII Division 1 Appendix Y, 2015 Edition.
The analysis of an Appendix Y flange is similar in many ways to the Appendix 2 evaluation. However, these flanges have metal-to-metal contact outside the bolt circle, unlike the types evaluated in Appendix 2. These flanges typically have a soft, self-sealing o-ring gasket that sits in the recess of one of the flange faces. The loads on the flanges are generated in a very similar manner to those in Appendix 2. The actual stress evaluation, however, is different.
This software evaluates flanges with or without hubs. A category 1 flange is an integral flange. The integral type must have the hub information specified. A category 2 flange is a loose type flange with a hub where the hub strengthens the assembly. A category 3 flange is a loose type flange where no credit is taken for the strengthening effect of the hub. Based on user input (especially flange type and hub information), the category is automatically determined.
Gasket and Gasket Factors
One critical value the software computes is the diameter of the load reaction. This value is termed G and is a function of where the gasket sits on the flange face. The value of G is typically the average of the gasket inner and outer diameters. For these types of flanges, the gasket ID is usually equal to the flange face ID and the gasket OD is usually equal to the flange face OD. Two other important factors are m and Y. The value of m is the leak pressure ratio, and the value of Y is the gasket design seating stress. This Appendix presumes these gaskets to be self-sealing (see the definition of Hg in the Code). Thus, the m and Y factors should both be 0.0. If any other value is entered, the user-defined values are echoed but the software uses values of 0.0 for both.