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Thank you that post is really insightful

I only have a version with equivalent mass in air at atmospheric pressure. I need to make a calculation in water at pressure....

Hi jmec87, Thank you very much for that informative post. I did mean 6X but did not realise it was not applicable to 6A - I should be using API 6A section 4.3. My main problem then comes from it being an allowable stress intensity. Some calculations such as the pressurised cylinder thickness...

Personally I wouldn't but I'm reviewing a whole set of calculations which I do not think are correct. I believe it is done because a valve is supplied to API 6A standards but the calculations are mostly ASME Div 1 or Div 2, hence the 'justification' for using 6A allowables on ASME calcs. Still...

Hi everybody, API 6AX states that stress intensity allowables are 2/3 yield at operating and 5/6 yield at hydrostatic test. When designing using ASME Div 1 & Div 2 it states to check stresses against allowables in ASME Section II Part D. Taking Div 2 as an example these are the minimum of...