CCPS Process Safety Glossary

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

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

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The minimum and maximum concentration of a particulate solid (dust) in a...

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Any liquid that has a closed-cup flash point below 100 F (37.8 C), 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...

A vapor that is above its lower flammable limit (LFL) concentration. A zone...

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A fire that spreads by means of a flame front rapidly through a diffuse fuel...

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

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

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A device to limit damage from a flashback by preventing propagation of the...

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Prevention of a recession of the flame into or back of the mixing chamber....

The temperature at which a liquid develops sufficient vapor pressure to form...

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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....

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

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

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Wind speed at the top of the boundary layer.

Number of occurrences of an event per unit time (e.g., 1 event in 1000 yr...

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The data required to generate accident and non-accident rates, the...

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Development of numerical estimates of the likelihood of an event occurring...

The fundamental scaling velocity, equal to the square root of the surface...

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The personnel who perform tasks that produce the output of the work group....

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When water is present or enters a tank containing hot viscous oil, the...

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the reducer; any combustible material, solid, liquid or gas. Most solids and...

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Gaseous fuels consisting of natural gas and various manufactured or by-...

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Those emissions which could not reasonably pass through a stack, chimney,...

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A deflagration explosion developed from a flammable cloud of gas, aerosol,...

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Field experiments of flow and dispersion around full sized obstacles (e.g...

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Flow in a long, constant area pipe in which the mean velocity profiles are...

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Failures from a system that works as designed but are inadequate for the...

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A phase in the development of computerized systems which produces detailed...

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