Pressure relief valve, oxygen, capacity calculation

[bcojocneanu]

I calculated a capacity for an oxygen pressure relief valve, using NB-18 formula:
W=C x K x A x P x √M/T

As long the area is in sq in, and the pressure is in psi, the capacity will be in what? SCFM? Really?

Same question for air:
W=18.331 x A x P x K

The result is in SCFM as long A is in sq in and P is in psi?

Thank you so much.

[JAlberts]

Yes, that is correct as long as the inlet pressure is stated in psia and the pressure is above that required for sonic (ie critical) flow.

[bcojocneanu]

Thank you, JAlberts. Yes, the inlet pressure is in psia. I understood the capacity units in this case is in SCFM. Correct?

[JAlberts]

Yes, the result is in SCFM.

[bcojocneanu]

Thanks again, JAlberts.