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ASME VIII-1 Appendix Y or Appendix 2 with UG-34

ASME VIII-1 Appendix Y or Appendix 2 with UG-34

ASME VIII-1 Appendix Y or Appendix 2 with UG-34


I have a drawing as below.

and I want to design the upper flange.

It looks like Appendix Y-Class 3-Category 3 is applicable for this drawing. and it has an equation for bottom flange thickness calculation as well.
and someone said i could use appendix 2 with UG-34, saying the upper flange is a blind flange.

Are both of them applicable for the configuration in the drawing?

Thank you for your time.

RE: ASME VIII-1 Appendix Y or Appendix 2 with UG-34

Definitely Appendix Y as there is metal to metal contact outside the bolt circle. The upper flange is not a blind flange, it's a loose ring type.

RE: ASME VIII-1 Appendix Y or Appendix 2 with UG-34

Thank you so much for your help!!

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