Tools and Resources
Orifice Plate Flow Meter
Calculate volumetric and mass flowrate from measured differential pressure — ISO 5167-2
Fluid Properties
Pipe & Orifice Geometry
Pressure taps at D upstream and D/2 downstream. Standard choice for most industrial applications.
Measured Differential Pressure
Results
Beta ratio (β = d/D)
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Discharge coefficient Cd (iterated)
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Pipe Reynolds number ReD
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Velocity of approach factor E
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Volumetric flowrate Q
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Volumetric flowrate Q (alt. units)
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Mass flowrate ṁ
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Mean pipe velocity u (upstream)
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Cross-Section Diagram
ISO 5167-2:2022 — Measurement of fluid flow by means of pressure differential devices — Orifice plates
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