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eng.orifice-plate-flow Calculator
Calculates volumetric flow rate through an orifice plate from upstream pressure, differential pressure, orifice diameter, and discharge coefficient. Orifice plate discharge coefficient is approximately 0.61 — it decreases at low Reynolds numbers and varies with orifice-to-pipe ratio (beta).
Inputs
Pipe Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Orifice Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Differential Pressure Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Fluid Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Cd Coefficient
Reference formula or conversion factor shown for context.
Results
volumetric flow rate Q (m³/s)
Flow rate Q — the volume of fluid passing a point per unit time.
mass flow rate (kg/s)
The computed mass of the object or substance.
flow velocity at orifice (m/s)
The value at the specified point or condition.
beta ratio β = d/D
The proportional relationship between two quantities.
Q = Cd·A₀·√(2ΔP/ρ)/√(1-β⁴)
Reference formula or conversion factor shown for context.
Cd typical range
The difference between the maximum and minimum values.