Upper Flammable Limit 04
Upper Flammable Limit 04 : Limits: (3) Influence of Temperature, Pressure and Composition: Flammability limits of mixtures of several combustible gases can be calculated using Le Chatelier's mixing rule for combustible volume fractions xi: and similar for UEL. Temperature, pressure, and the concentration of the oxidizer also influences flammability limits. Higher temperature results in lower LFL and higher UFL, while greater pressure increases both values. The effect of pressure is very small at pressures below 10 millibar and difficult to predict, since it has only been studied in internal combustion engines with a turbocharger. Oxygen enriched atmospheres lower the LFL and increase the UFL. An atmosphere devoid of an oxidizer is neither flammable or explosive regardless of the fuel gas concentration. Increasing the fraction of inert gases in an air mixture raises the LFL and decreases the UFL
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