External pressure calculations are performed on vessel A1 and A2 if you have entered a value for the external pressure. These calculations are performed per Appendix 13, Section 13-14 as follows:
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The external pressure is substituted for the internal pressure, and the calculations discussed previously are performed again.
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The four side plates and the end plates are checked for stability per equation (1) of 13-14(b).
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The entire cross section is checked for column stability in accordance with equation (1) from paragraph 13-14(c).