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Definitions (1703)

1.

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Accident


An unplanned event or sequence of events that results in an undesirable consequence.
Source: aiche.org

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Installation


In the context of the EU Seveso Directive (Seveso 2), a technical unit within an establishment in which dangerous substances are produced, used, handled, or stored. It includes all the equipment, structures, pipework, machinery, tools, private railway sidings, docks, unloading quays serving the installation, jetties, warehouses or similar structure [..]
Source: aiche.org

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Purging


The removal of oxygen from a closed system (equipment and piping) to below the LOC of the particulate solid by means of applying pressure, vacuum, and/or a purge gas.
Source: aiche.org

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Word


A data element of length 16 bits.
Source: aiche.org

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Abnormal Situation


A disturbance in an industrial process with which the basic process control system of the process cannot cope. In the context of hazard evaluation procedures, synonymous with deviation.
Source: aiche.org

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Abort


To terminate a procedure, such as the running of a computer program or the printing of a document while it is still in progress. The process of halting a computer program in an orderly fashion and returning control to the operator or operating system. Abnormal termination of a computer program, caused by hardware or software malfunction or operator [..]
Source: aiche.org

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Acceptance criteria


Technical basis used to determine whether equipment is deficient (e.g., when analyzing inspection, testing, and preventive maintenance [ITPM] results).
Source: aiche.org

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Acceptable Risk


The average rate of loss that is considered tolerable for a given activity.
Source: aiche.org

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Accelerating Rate Calorimetry


A technique in which a substance is heated in stages until very slow decomposition [or other reaction] is detected. The substance is then held under adiabatic conditions and the course of the decomposition [or other reaction] is monitored. (Also the name of a commercial test apparatus.) [Barton and Rogers 1997]
Source: aiche.org

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Absorption


The process of contacting a vapor and gas stream with an absorbing liquid to remove specific materials from the gas stream.
Source: aiche.org


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