Orifice Flow Discharge Calculator
Calculate flow rate through an orifice using discharge coefficient and pressure difference
About this calculator
The Orifice Flow Discharge Calculator determines the volumetric flow rate of fluid passing through an orifice plate or opening. This tool is essential for engineers, technicians, and fluid system designers who need to measure or predict flow rates in pipelines, tanks, and process equipment. By inputting the orifice diameter, discharge coefficient, and pressure difference across the orifice, users can accurately calculate flow rates for water, oil, gas, and other fluids in industrial applications.
How to use
Enter the orifice diameter, discharge coefficient (typically 0.6-0.8 for sharp-edged orifices), and pressure difference across the orifice. Select appropriate units for each parameter. The calculator will instantly compute the volumetric flow rate using the standard orifice flow equation, providing results in your preferred flow units.
Frequently asked questions
What is a typical discharge coefficient for orifices?
Sharp-edged orifices typically have discharge coefficients between 0.6-0.65, while rounded orifices can reach 0.8-0.85 depending on design and Reynolds number.
How accurate are orifice flow measurements?
Properly designed orifice plates can achieve accuracies of ±1-2% when calibrated correctly and operated within recommended flow ranges and conditions.
What pressure difference should I measure?
Measure the static pressure difference between upstream and downstream taps, typically located one pipe diameter before and after the orifice plate.