If loads from the mating flange are to be considered, check this field. A pop-up spreadsheet will appear for additional data entry. This auxiliary bolt loading will only be used if it is greater than the standard bolt loads computed using the ASME formulas.
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The use of mating flange values for bolt design calculations will result in incorrect MAWP calculations. Do not calculate MAWP based on the mating flange values, but instead based on the values developed by this flange at a given pressure.
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Do not do a design when you have a mating flange, because the software selects a different value (such as bolt circle) from the one chosen for the other flange. You can however, do a partial thickness design.