Orifice Flow Meter Calculator

Engineering tools for orifice plate flow measurement of natural gas and mixed-gas pipelines, following ISO 5167 and AGA Report No. 8.

Mass and volume flow from pipe and orifice diameters, differential pressure and gas conditions.

Classic sizing table: flow vs. pipe diameter, orifice diameter and differential pressure (10 / 50 / 90 % of range).

Select the orifice diameter for a required flow range.

Gas drainage formula: QH = K·b·√ΔH·бT·бP / √9.81.

Pressure, temperature, flow and length conversions.

Features

ISO 5167-2:2003 discharge coefficient (Reader-Harris/Gallagher); corner, flange and D-D/2 taps
AGA8-92DC equation of state for compressibility factor Z, or manual Z input
Gas input by relative density SG + CO2/N2, or full mole fractions
Mass flow, operating and standard volume flow, velocity, Reynolds number
9 languages with automatic browser-language detection

For engineering reference. Confirm final metering design against the governing standard and calibration data.