2 thoughts on “RESTRICTION ORIFICE SIZING VAPOR and GAS FLOW CALCULATOR (RO)

  • 2018-12-22 at 21:54
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    Hello Raj,

    The calculator in this page is desgined to size simple RO with small dp. The one you are trying to size should be calculated using a multistage RO aproach.

    I’ve found 3 articles regarding this subject:

    • Philip Thompson, Compressible Fluid Dynamics – example 6.3, 1972
    • Tung and Mikasinovic, Chemical Engineering, December 12, 1983, pgs 69-71
    • Lin S.H., Hydrocarbon Processing, July 1985, pgs 93-95

    Essentially, you need to start with the last orifice [1] (the one near your service pressue) and then calculate the maximum dP it can take across the orifice to avoid cavitation.

    Once it is done you have to use the calculated inlet pressure [1] as the outlet pressure for the new orifice [2] and then calculate again the maximum dP.

  • 2018-12-19 at 15:05
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    I have a case where the pressure drop is 176 bar.
    How to size this RO. I guess this will be a multi stage RO.

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