CCPS Process Safety Glossary

A device fitted to the opening of an enclosure or to the connecting piping...

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That portion of a flame arrester whose principal function is to prevent...

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That portion of flame arrester whose principal function is to provide a...

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A device that prevents transmission of a flame from a source to a receptor...

The dimensions in which a burning or exploding gas is free to expand, 1D, 2D...

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That portion of the flame reaction zone moving into the unburned gas where...

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A device that opens in response to the pressure wave preceding the flame...

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The movement of a flame front in piping or equipment.

The speed of a flame front relative to a fixed reference point. Flame speed...

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Theoretical temperature achieved based on chemical equilibrium with the...

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Another name for a flame arrester, commonly used in the United Kingdom.

See Flame Speed

A gas that is flammable in a mixture of 13 percent or less (by volume) with...

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The minimum and maximum molar (or volume) concentrations of a combustible...

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The minimum and maximum concentration of fuel vapor or gas in a fuel vapor...

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A term used to classify certain liquids as defined by NFPA 30 as a liquid...

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Any liquid that has a closed-cup flash point below 100ºF (37.8ºC), as...

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

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

The temperature at which the vapor-air mixture above a liquid is capable of...

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The combustion of a flammable gas or vapor and air mixture in which the...

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The combustion of a flammable vapor and air mixture in which flame passes...

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The minimum temperature at which a liquid gives off sufficient vapor to form...

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The minimum temperature at which a liquid gives off vapor in sufficient...

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The lowest temperature at which vapors above a volatile combustible...

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Undesired flame propagation opposite to the direction of flow. It is also...

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An aperture designed to produce flow velocities which exceed the local flame...

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Experiments carried out at small scale in wind tunnels and water channels....

Failure Mode Effect (and Criticality) Analysis; A technique in which all...

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An event or effect that cannot reasonably be anticipated or controlled.

The art and science of professional practice of those qualified to serve as...

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A device that is of the correct physical size and general appearance, and...

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The conventional scientific designation for a material (water is H2O,...

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A probability representing the mean proportion of the total relevant time...

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The mean fraction of time in which a component or system is unable to...

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G Wind speed at the top of the boundary layer.

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