Tools and Resources
Liquid Orifice Diameter Calculator
Calculate required orifice bore diameter from flow rate and differential pressure — ISO 5167-2
Fluid Properties
Flow Conditions
Pipe Geometry
Flange taps: Pressure tapped 1 inch (25.4 mm) from each plate face. Most common in industry — use this if unsure.
Result
Required orifice diameter
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Beta ratio (β = d/D)
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Reynolds number
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Discharge coefficient Cd
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Pipe flow velocity (upstream)
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Cross-Section Diagram
ISO 5167-2 · Reader-Harris/Gallagher equation ·
Valid: β 0.10–0.75 · ReD > 5 000 · D 50–1 000 mm
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