Thank you very much, MJCronin. I have no access to that ASME 3-31-3. And the link you put with those formulae does not have a source either.
I hope I can find or somebody answers this issue clearly.
Hi, I want to know the formula to calculate Restriction Orifice Thickness, I found on the internet this one "Minimum RO thickness ≥ SQRT [(0,681-0,651*Beta)*deltaP/Y] * pipeID" it says it is according to R.W. Miller, but I could not find it in the Flow Measurement Handbook Miller 3rd Edition...