I submit flange calculation according to ASME VIII div 1 Appendix 2 with stress analysis for operating and gasket seating conditions (to get approval for CE marking). The notified body replies that there is too high stress in hydrotest conditions. I know that hydrotest conditions calculation is considered only with European standards and the safety factors for allowable stresses aren't the same as for the operating and gasket seating conditions. In ASME VIII-1 no indications for calculation with hydrotest conditions. So the notified body hadn't to consider this calculation. Have you any remark.
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