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September 2024

Flash Fire

A fire that spreads by means of a flame front rapidly through a diffuse fuel, such as a dust, gas, or the vapors of an ignitable liquid, without the production of damaging pressure.

Flammable Vapor

A vapor that is above its lower flammable limit (LFL) concentration. A zone of flammable vapor will exist in equilibrium with a flammable or combustible liquid any time it is above its flash point.

Flammable Range

The range of concentrations between the lower and upper flammability limits.

Flammable Mass

The mass of fuel in a vapor cloud that is in the flammable range, mf.

Flammable Liquids

Any liquid that has a closed-cup flash point below 100 F (37.8 C), as determined by the test procedures described in NFPA 30 and a Reid vapor pressure not exceeding 40 psia (2068.6 mm Hg) at 100 F (37.8 C), as determined by ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum...

Flammable Limits (Dusts)

The minimum and maximum concentration of a particulate solid (dust) in a dust/gaseous oxidant mixture (usually expressed in percent by volume) defining the concentration range (flammable or explosive range) over which propagation of flame will occur on contact with an ignition source. See also...

Flammable Limits

The minimum and maximum concentration of fuel vapor or gas in a fuel vapor or gas/gaseous oxidant mixture (usually expressed in percent by volume) defining the concentration range (flammable or explosive range) over which propagation of flame will occur on contact with an ignition source. See also...

Flammable Gas (NFPA 55)

A gas that is flammable in a mixture of 13 percent or less (by volume) with air, or the flammable range with air is wider than 12 percent regardless of the lower limit, at atmospheric temperature and pressure.

Flammable

A gas that can burn with a flame if mixed with a gaseous oxidizer such as air or chlorine and then ignited. The term flammable gas includes vapors from flammable or combustible liquids above their flash points.

Flammability Limits

The range of gas or vapor amounts in air that will burn or explode if a flame or other ignition source is present. Importance: The range represents an unsafe gas or vapor mixture with air that may ignite or explode. Generally, the wider the range the greater the fire potential. See also Lower...

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