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Q. While designing a heat exchanger tubesheet flange, the "Use EN 13445 Annex G/EN 1591" option is greyed out, why?
Ans: This is because there is nothing (no method) in Annex G about how to design the extended part of the tubesheet (as a flange).
Consequently when a flange is associated to a tubesheet this option is disabled in AutoPIPE Vessel.