Determine if orifice gas flow should use the 2012 expansion factor calculation.

This simple app helps to determine if a natural gas flow measured in an orifice meter should use the 2012 version of AGA 3 Part I/API 14.3 part I equation for calculating the Expansion Factor (Y).

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Enter values for differential pressure (inches H2O), upstream static pressure (psia), orifice diameter (inches), tube inside diameter (inches).

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Results include pass/fail indicators for:

X1 (Ratio of DP/Pf1)

Expansion Factor Calculated From 1992 Standard

Expansion Factor Calculated From 2012 Standard

Expansion Factor Difference (with validity color coding)

Guidance for equation to use