mgruschow
Industrial
- Jul 24, 2006
- 1
I've seen a lot of discussion regarding API and ASME sizing of relief valves; e.g. thread1203-135368. And I agree that the API sizing gives you an "effective" area while the ASME gives you actual area.
What's interesting is that both equations are identical. The only possible variation in the factors is the valve discharge coefficient, Kd (API) and K (ASME) which is manufacturer dependent. Since the API areas are somewhat more conservative than the ASME, you would intuitively expect something in the equations to differentiate between the two.
It would also be interesting to see educated discussion that compared the two approaches along with a tabulation of API vs ASME orifice areas cross-referenced to the Alpha orifice designations.
Any thoughts?
What's interesting is that both equations are identical. The only possible variation in the factors is the valve discharge coefficient, Kd (API) and K (ASME) which is manufacturer dependent. Since the API areas are somewhat more conservative than the ASME, you would intuitively expect something in the equations to differentiate between the two.
It would also be interesting to see educated discussion that compared the two approaches along with a tabulation of API vs ASME orifice areas cross-referenced to the Alpha orifice designations.
Any thoughts?