1. Enter operating data
Provide minimum, normal and maximum flow, operating pressure and temperature, medium and actual pipe internal diameter where available. Gas and steam results depend strongly on the property and reporting basis.
ONLINE TOOL
DP Flow Meter Sizing Calculator
Enter your process conditions to calculate beta ratio, bore diameter, differential pressure, discharge coefficient and permanent pressure loss. Based on ISO 5167:2022 (Reader-Harris/Gallagher 1998).
Process Data Input
Calculation Results
Enter process data and click Calculate to see results
HOW TO USE THE RESULT
A screening calculation—not a manufacturing certificate
Use the calculator to compare a preliminary bore or geometry, expected differential pressure and permanent pressure loss at the stated operating points. It helps identify whether the proposed transmitter span can produce a useful signal from minimum through maximum flow. The result is not a substitute for a controlled sizing sheet, approved drawing, material review or final uncertainty evaluation.
2. Review the full range
Check differential pressure and Reynolds number at every operating point, not only at maximum flow. Because DP changes approximately with flow squared, low-flow signal quality often controls practical rangeability.
3. Confirm the engineering basis
Final selection must confirm the applicable standard or calibration route, allowable loss, upstream disturbances, pressure class, wetted materials, pressure taps, compensation and commissioning method.
Important: ISO 5167 coefficients apply only when the selected primary element, geometry, Reynolds number, flow condition and installation are inside the relevant part of the standard. Non-standard devices and out-of-scope operating points require a documented project-specific coefficient or calibration basis. Send the preliminary result with the process datasheet to Shizhong for final review.