NFPA 68 NFPA 69 API 521
Flammability limits, Le Chatelier's rule, combustion chemistry, and flame propagation
Calculates flammability limits for gas mixtures from pure component limits weighted by mole fractions.
Complete combustion requires exact oxygen ratio. Excess air ensures complete burn.
It calculates flammability limits (LEL/UEL), stoichiometric air requirements, adiabatic flame temperature, and combustion products for hydrocarbon mixtures per NFPA 68/69.
LEL (Lower Explosive Limit) and UEL (Upper Explosive Limit) define the concentration range in which a gas-air mixture is flammable.
The calculator follows NFPA 68 and NFPA 69 standards for combustion and flammability analysis of natural gas and hydrocarbon mixtures.