🎯 Orifice Plate Flow Calculator (ISO 5167)
Calculate volume/mass flow rates or differential pressure drops across square-edged orifice plates. Incorporates the standard Reader-Harris/Gallagher discharge coefficient formulation and expansibility factor corrections.
📋 Sizing Parameters
📊 Sizing Results
Mass Flow Rate ($\dot{m}$)
—
kg/s
Volume Flow Rate ($Q$)
—
m³/h
Differential Pressure ($\Delta P$)
—
kPa
Discharge Coef ($C_d$)
—
ISO 5167-2
Expansibility ($\epsilon$)
—
Gas expansion
Reynolds Number ($Re_D$)
—
Pipe flow
Pressure Loss ($\Delta\omega$)
—
kPa
Compliance: ISO 5167 Check OK
All parameters fall within standard limits. Calculated results are validated.
ISO 5167 Orifice Plate Sizing:
• $\dot{m} = \frac{C_d \cdot \epsilon \cdot \frac{\pi}{4} d^2}{\sqrt{1 - \beta^4}} \sqrt{2 \cdot \rho_1 \cdot \Delta P}$ (Mass Flow)
• $C_d = f(Re_D, \beta, \text{tap type})$ — Reader-Harris/Gallagher (1998) Eq.
• $\epsilon = 1 - (0.351 + 0.256\beta^4 + 0.93\beta^8)[1 - (P_2/P_1)^{1/\kappa}]$ (for gases)
• $\beta = d/D$ (Beta Ratio)
• $\dot{m} = \frac{C_d \cdot \epsilon \cdot \frac{\pi}{4} d^2}{\sqrt{1 - \beta^4}} \sqrt{2 \cdot \rho_1 \cdot \Delta P}$ (Mass Flow)
• $C_d = f(Re_D, \beta, \text{tap type})$ — Reader-Harris/Gallagher (1998) Eq.
• $\epsilon = 1 - (0.351 + 0.256\beta^4 + 0.93\beta^8)[1 - (P_2/P_1)^{1/\kappa}]$ (for gases)
• $\beta = d/D$ (Beta Ratio)