What Is the Venturi Tube Differential Pressure Flow Rate Calculator?
The Venturi Tube Differential Pressure Flow Rate Calculator determines fluid mass and volume flow rates in industrial process piping.
How Does the Venturi Tube Differential Pressure Flow Rate Calculator Work?
It converts measured differential pressure into velocity through the constricted throat using ISO 5167 discharge coefficients and approach velocity factors.
Venturi Tube Differential Pressure Flow Rate Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
q_m = C_d \frac{A_2}{\sqrt{1 - \beta^4}} \sqrt{2 \rho \Delta P}, \quad \beta = \frac{d}{D}, \quad Q = \frac{q_m}{\rho}
ISO 5167 formulation combining Bernoulli energy conservation and continuity equation.
How to Use the Venturi Tube Differential Pressure Flow Rate Calculator
- Enter pipe internal diameter and throat diameter in mm.
- Specify measured differential pressure across pressure taps in kPa.
- Input fluid density and discharge coefficient.
Step-by-Step Example Calculation
150 mm Water Supply Main Venturi Tube
Input Values:
pipeInletDiameterD1Mm:150
venturiThroatDiameterD2Mm:75
differentialPressureKPa:25
fluidDensityKgPerM3:1000
dischargeCoefficientCd:0.985
Worked Steps: Beta ratio is 0.50, delivering 31.81 L/s (114.5 m³/h) at 7.20 m/s throat velocity with only 3.0 kPa permanent pressure loss.
Understanding Your Result
Volumetric Flow Rate: Discharge in L/s and m³/h.
Mass Flow Rate: Mass throughput in kg/s.
Throat Velocity: Flow speed through the constricted restriction.
Factors That Affect the Result
- Beta ratio (d/D) controls sensitivity: smaller throats produce larger readable ΔP signals but higher throat velocities.
When Should You Use This Calculator?
- Municipal water distribution metering, compressed gas pipelines, power plant feedwater lines, and chemical plant flow control.
Assumptions & Limitations
- Assumes fully developed turbulent pipe flow without severe swirling upstream disturbances.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Conforms to ISO 5167-4 Measurement of fluid flow by means of pressure differential devices.