This application calculates the flowrate through a large-diameter orifice using the approach outlined in ISO 5167 2:2003.
Orifice meters use the pressure loss across a constriction (that is, the orifice plate) in a pipe to determine the flowrate.
The formulas are valid for:
- pipes diameters between 50mm and 1000 mm,
- and pressure ratios greater than 0.75.
