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Thread: Pressure relief valve, oxygen, capacity calculation

  1. #1
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    Pressure relief valve, oxygen, capacity calculation

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    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.

  2. #2
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    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.
    Last edited by JAlberts; 10-10-2013 at 01:35 PM.

  3. #3
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    Thank you, JAlberts. Yes, the inlet pressure is in psia. I understood the capacity units in this case is in SCFM. Correct?

  4. #4
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    Yes, the result is in SCFM.

  5. #5
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    Thanks again, JAlberts.

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