When referring to the L.E.L. of a flammable or combustible liquid, what does the L.E.L. mean?

When referring to the L.E.L. of a flammable or combustible liquid, what does the L.E.L. mean?

• A. Lowest Efficiency Level
• B. License Equivalency Label
• C. Lower Explosive Limit
• D. Lowest Evaporation Limit

Answer: (C)

Lower Explosive Limit means the smallest amount of flammable vapor in air that can ignite and sustain a flame if there’s an ignition source. It’s expressed as a percent by volume in air. If the vapor concentration is below this limit, the mixture is too lean to burn. Between the lower and upper explosive limits, a mixture can ignite when exposed to a spark or flame. Detectors and safety procedures use percent of LEL to gauge how close the environment is to a flammable or explosive condition, helping workers keep ventilation and controls adequate to prevent ignition.

Lower Explosive Limit means the smallest amount of flammable vapor in air that can ignite and sustain a flame if there’s an ignition source. It’s expressed as a percent by volume in air. If the vapor concentration is below this limit, the mixture is too lean to burn. Between the lower and upper explosive limits, a mixture can ignite when exposed to a spark or flame. Detectors and safety procedures use percent of LEL to gauge how close the environment is to a flammable or explosive condition, helping workers keep ventilation and controls adequate to prevent ignition.