Flange rigidity check

[yatin888]

IS it necessary to calculate flange rigidity for hydrostatic pressure established as per UG-99(b) or UG-99(c)?

[shm8324]

Flange Rigidity in Hydrocase is not required- See below ASME Interpretation

Interpretation: VIII-1-10-41
Subject: Appendix 2, 2-14; UG-99(b); UG-99(c); and Interpretation VIII-1-07-52 (2010 Edition)
Date Issued: August 30, 2011
File No.: 11-1236
Question: In satisfying the provisions of Appendix 2, 2-14, is it required to calculate the flange rigidity for
hydrostatic test condition with test pressure established as per UG-99(b) or UG-99(c)?
Reply: No.