The point at which the concentration of a gas in air becomes too great to allow an explosion upon ignition due to insufficient oxygen present. Found in: Water Treatment Plant Operation, Vol I & II Water Distribution System O&M Small Water System O&M Operation of Wastewater Treatment Plants, Vol II Pretreatment Facility Inspection
the maximum concentration of vapors or gas in the air above which it is not possible to cause ignition of the vapors with a proper ignition source.
Maximum concentration of a gas in percent that will combust in the atmosphere.
the limit above which, the concentration of hydrocarbon gas in the air mixture is considered to be "too rich" ie insufficient air to support and propagate combustion; UEL in short
The maximum concentration of a combustible gas in air which will ignite if a source of ignition is present. Used interchangeably with the term "upper flammability limit" (UFL).
Also known as Upper Flammable Limit (UFL). The highest concentration (expressed in percentage of vapor or gas by air volume) of a substance that will burn or explode when an ignition source is present. Theoretically, above this limit the mixture is said to be too "rich" to support combustion. The range is between the LEL and the UEL, constitutes the flammable range, or explosive range of a substance. For example, if the LEL is 1 ppm and the UEL is 5 ppm, then the explosive range of the chemical is 1 ppm to 5 ppm.
the concentration of flammable vapors is above a level which will result in a flame given an ignition source. There is not enough oxygen to support combustion (the mixture is too rich to ignite).
The highest concentration (expressed in percent vapor or gas in the air by volume) of a substance that will burn or explode when an ignition source is present.
The highest concentration of the material in air that can be detonated. The maximum fuel-to-air mixture where combustion can occur.
