Using the Flammability Diagram To Avoid Flammable Atmospheres

Using the Flammability Diagram To Avoid Flammable Atmospheres 

One might suggest an even more optimized procedure. This involves first pumping air into the vessel until a point is reached on the air stoichiometric line above the UFL. This is followed 

LFL is the volume percent of fuel in air at the lower flammability limit, and z is the stoichiometric oxygen coefficient from the combustion reaction given by Equation 6-9. 

Another approach is to estimate the fuel concentration at point S by extending the line from point R though the intersection of the minimum oxygen concentration (M) and the stoichiometric combustion line. The analytical result is 

Chemical OSFC (vol. % Fuel) ISOC (vol. % oxygen) Chemical OSFC (vol. % Fuel) ISOC (vol. % oxygen) 

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