Flare Purge Gas Calculator


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Purge gas flow requirement calculator to determine the minimum required continuous purge gas flow in a flare stack to avoid air ingress into the flare stack.

Composition of purge gas Component mole fraction
Hydrogen
Helium
Nitrogen
CO2
Methane
Ethane
Propane
C4+
Flare Stack Diameter m
Required purge gas flow Nm3/hr

The purge gas flow calculation is based on the guidelines from API standard 521.

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