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Orifice Air Discharge vs. Pressure

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The diagram below indicates the air leakage or air volume passing through orifices ranging size 1/64 - 1/4 inches. For well rounded nozzles multiply the vlues in the diagram with 0.97. For sharp edged nozzles multiply the values with 0.65.

  • 1 psig = 6.9 kPa = 0.069 bar
  • 1 inch = 25.4 mm
  • 1 scfm = 0.472 nl/s
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