Appendix 2 Bolt Area

Be careful with plugging Bolt Area (Ab) from Appendix 2 into your PCC-1 Appendix O calculation!

While performing a third party review I noticed something fishy about a calculated Selected Assembly Bolt Stress (Sbsel) value. It turned out that the Bolt Area (Ab) was off by the number of bolts. A simple mistake that almost turned into a terrible facility torque table!

You can’t directly plug in the Bolt Area (Ab) from the ASME Appendix 2 Flange calculation into the Bolt Area (Ab) needed for the ASME PCC-1 Appendix O calculations. This is because the Bolt Area (Ab) from Appendix 2 Flange calculation includes the number of bolts in it already while the ASME PCC-1 Appendix O does not. Notice that the ASME PCC-1 Appendix O calculation multiplies by the Number of Bolts (nb) in the denominator.

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