CCPS Process Safety Glossary

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The ratio of fuel concentration in the actual fuel-air mixture divided by...

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used in the Kit Fox experiments, consisting of square plywood boards with W...

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A modification of the Average Rate of Death that takes into account society'...

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See Confidence interval.

The ratio of the 95th percentile value to the median value of a lognormal...

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A work situation in which the performance-shaping factors are not compatible...

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Use of process or design features to prevent the occurrence, further...

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Criteria defining the required content or conduct of a PHA based upon...

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Personnel with specific work activities that require them to be located in...

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In the context of the EU Seveso Directive (Seveso 2), the whole area under...

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To reach a conclusion as to significance, worth, effectiveness, or...

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A number showing how fast a liquid will evaporate. Importance: The higher...

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An occurrence involving a process that is caused by equipment performance or...

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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 method used for modeling the propagation of an initiating event through...

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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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A finding that is a deviation from a standard.

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 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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Risk criteria that are calibrated or validated against established consensus...

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The ability of a dust to take part in a closed explosion when dispersed in...

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A numerical measure of the explosion hazard potential of a dust as...

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

The bursting or rupture of an enclosure or container due to the development...

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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.

Where the gas composition is maintained outside the flammable region.

Where devices are provided to minimize pressure development if ignition...

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An overall measure of the potential hazard associated with a closed vessel...

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

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