CCPS Process Safety Glossary

A number showing how fast a liquid will evaporate.

Importance: The...

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An occurrence related to equipment performance or human action, or an...

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An occurrence involving the process caused by equipment performance, human...

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A specific unplanned sequence of events composed of initiating events and...

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A logic model that graphically portrays the combinations of events and...

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A graphical logic model that identifies and quantifies possible outcomes...

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Data on which the investigation team will rely for subsequent analysis,...

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the collection of data on which the investigation team will rely for...

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The process of performing the operations of a specified portion of an...

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A physical or chemical change accompanied by the evolution of heat.

A physical or chemical change that requires or is accompanied by the...

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A reaction involving one or more chemicals resulting in one or more new...

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The ratio of the volume after combustion to that prior to combustion.

The list of incidents from which the study group is selected. An Expansive...

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The average number of occurrences of the fault event during a specified time...

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A release of energy that causes a pressure discontinuity or blast wave. (...

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A release of energy sufficient to cause a pressure wave; a rapid or sudden...

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The bursting or rupturing of an enclosure or container due to the...

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The ratio of the mechanical energy released in an explosion to the heat of...

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Any pressure above atmospheric caused by a blast. (CCPS, 1994)

An intentionally weakly supported panel in the wall of an enclosure designed...

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A chemical that causes a sudden, almost instantaneous release of pressure,...

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Formula proposed for vegetative canopies that is also valid for other types...

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An equipment's operating time in hours.

Expressed in terms of a continuous variable, such as the time equipment is...

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The historical number of demands experienced by the equipment population....

The historical operating time of the equipment population.

A WDT that is independent of the PES.

An electronic internal timer...

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Event caused by (1) a natural hazard-earthquake, flood, tornado, extreme...

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As used in this publication, a factor that is not an intrinsic property of a...

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A plot of cumulative frequency versus consequences (expressed as number of...

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A portion of or complete plant, unit, site, complex or any combination...

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On-site Engineering section or group providing service to the local facility...

Describes an equipment fault which would inhibit or delay automatic shut-...

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Design features which provide for the maintenance of safe operating...

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A circuit that has an output state which indicates that either a circuit...

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