Flow Estimate Guides for Liquid and Gas





 

 

To Calculate Liquid Flow (water) through Orifice
Estimated Cv Values Orifice Size  
       
  0.00001 0.0008" Q =Cv DP
  0.00003 0.0012" Q = GPM (gallons per minute)
  0.000053 0.0016" P = pressure differential in PSIG
  0.000090 0.0020" Cv = flow factor
  0.00012 0.0024"
  0.00017 0.0028" Example for flow of .005" orifice
  0.00022 0.0031" at 25 psi
  0.00028 0.0035"
  0.00035 0.0040" Q =Cv DP
  0.00061 0.0050" Q = .00061 x 25
  0.00086 0.0060" Q = .00061 x 5
  0.00120 0.0070" Q = .003 GPM
  0.00150 0.0080"
  0.00190 0.0090" To convert GPM to liters P/M
  0.0025 0.0100" 3.75 liters per gallon
  0.0028 0.0110" .003 x 3.75 = .01125 liters P/M
  0.0034 0.0120"  
  0.0038 0.0130" To convert to milliliters (CCM's)
  0.0043 0.0140" 1,000 CCM's = 1 liter
  0.0050 0.0150" 1,000 x .01125 = 11.25 ML/PM
  0.0055 0.0160"  
  0.0067 0.0170" The Cv factor is based on the
  0.0073 0.0180" number of U.S. gallons of water
  0.0080 0.0190" that can pass through a given
  0.0088 0.0200" orifice area in one minute at a
  0.0096 0.0210" pressure drop of one psi
  0.011 0.0220"
  0.012 0.0230" Q =Cv (DP/S.G.)
  0.013 0.0240"
  0.014 0.0250" Liquid Flow Values are Based on
  0.020 0.030" 60 degree F and are Estimates Only
  0.028 0.035"
  0.036 0.040"
  0.041 0.043"
  0.048 0.047"
  0.059 0.052"
  0.081 0.060"
  0.088 0.063"
  0.100 0.067"
  0.110 0.070"  
  0.120 0.073"  
  0.140 0.079"  
  0.150 0.081"  

 

 

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