CCPS Process Safety Glossary
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The highest concentration of combustible material that will propagate a... Read More... |
See Uninterruptible Power Supply. |
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Uniform Roughness Array used at the Kit Fox experiments, consisting of... Read More... |
Because of heat generated by man’s activities and by industrial processes,... Read More... |
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Synonymous with Application Program. |
The portion of the PES memory reserved for the storage of Application... Read More... |
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Unconfined Vapor Cloud Explosion; Explosive oxidation of a vapor cloud in a... Read More... |
In the event of instrument air or electrical power failure, valves either... Read More... |
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A gas that is at a temperature below the critical temperature, so that it... Read More... |
The explosion resulting from the ignition of a cloud of flammable vapor, gas... Read More... |
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Explosive oxidation of a vapor cloud in a nonconfined space (not in vessels... Read More... |
A piping system to which vessels are connected, that collects vapors from... Read More... |
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The weight of a vapor or gas compared to the weight of an equal volume of... Read More... |
The pressure exerted by a vapor above its own liquid. The higher the vapor... Read More... |
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The pressure exerted by a saturated vapor in equilibrium with its own liquid... |
A quantity or condition whose value is subject to change and can usually be... Read More... |
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See Flow Controlled Aperture. |
The hardware and software suppliers of a computerized system. There may be... Read More... |
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An opening for the passage of, or dissipation of, fluids, such as gases,... Read More... |
See Vapor Collection System |
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A group of specialized models for expressing the concentration on the roof... Read More... |
The process of supplying or removing an atmosphere to or from any space by... Read More... |
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Emergency flow of vessel contents out of a vessel. The pressure is... Read More... |
The area very close to the source where the specific geometry of one or two... Read More... |
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The offset in distance to the specified source of a gas or vapor release... Read More... |
This method is applied when there is a change in dispersion conditions at... Read More... |
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Nonconductive liquid having a kinematic viscosity above 30–100 cS and a very... Read More... |
See “Potential.” |
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The voltage common to all conductors of a group as measured between that... Read More... |
The voltage at a given location between two conductors of a group. |
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The ratio of the volume occupied by congestion elements such as pipes, beams... Read More... |
Models that predict explosion characteristics based on the volumetric... Read More... |
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An out of n redudant system which requires at least m of the n channels to... Read More... |
A timer implemented to prevent the system from looping endlessly or becoming... Read More... |
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A manufacturer provided means performing specific actions if the integrity... Read More... |
An external watchdog timer is preferred to an internal watchdog timer to... Read More... |