AGA Report No. 3 / ISO 5167-2 Orifice Meter Calculator
Calculates gas flow rates using the Reader-Harris/Gallagher discharge coefficient equation. Supports flange, corner, and D/D/2 tap configurations with iterative Reynolds number convergence and ISO 5167 compliance validation.
Calculation Mode:
Pipe & Orifice Dimensions
in
in
Operating Conditions
in H₂O
Typical: 10-200 in H₂O for optimal accuracy
psig
°F
Gas Properties
-
Natural gas: 0.55-0.70, Methane: 0.554
lb/lbmol
MW = SG × 28.97 (calculated from gravity)
-
Typical: 0.90-1.00 for natural gas
-
Natural gas: 1.27-1.31, Methane: 1.31
Design Requirements
MMSCFD
Design flow at standard conditions (14.73 psia, 60°F)
in H₂O
DP budget at design flow (transmitter full scale)
in
Operating Conditions
psig
°F
Gas Properties
-
Natural gas: 0.55-0.70, Methane: 0.554
lb/lbmol
MW = SG × 28.97 (calculated from gravity)
-
Typical: 0.90-1.00 for natural gas
-
Natural gas: 1.27-1.31, Methane: 1.31
📚 Learn the Theory
Understand AGA Report 3 equations, discharge coefficient, beta ratio, and flow measurement