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FLAMMABLE AND COMBUSTIBLE LIQUIDS |
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Flammable Limits |
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There is a minimum concentration of vapor or gas in air
below which propagation of flame does not occur on contact with a source of ignition.
There is also a maximum proportion of vapor in air above which propagation of flame does
not occur. These boundary-line mixtures of vapor with air are known as the lower and upper
flammable or explosive limits (LEL or UEL) respectively, and they are usually expressed in
terms of percentage by volume of vapor in air. In popular jargon, a vapor/air mixture below the flammable limit is too "lean" to burn or explode, and a mixture above the upper flammable limit is too "rich" to burn or explode. No attempt is made to differentiate between the terms flammable and explosive as applied to the lower and upper limits of flammability. |
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