September 2024 | AIChE

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September 2024

Sigma 7 Risk Engineering\7 Paragon

Zone

Classification system for electrical and electronic equipment and wiring for all voltages in locations where fire or explosion hazards may exist, as defined in Article 505 of NFPA 70 National Electrical Code.

Written program

A description of a management system that defines important aspects such as purpose and scope, roles and responsibilities, tasks and procedures, necessary input information, anticipated results and work products, personnel qualifications and training, activity triggers, desired schedule and...

Worst-Case Scenario (WCS)

A release involving a hazardous material that would result in the worst (most severe) off-site consequences.

Worst Possible Incident

The most severe incident, considering only incident outcomes and their consequences of all identified incidents and their outcomes.

Worst Credible Incident

The most severe plausible or reasonably believable incident, considering only incident outcomes and their consequences, of all identified incidents and their outcomes.

Worst Credible Case

The most severe consequences, considering all scenarios and their outcomes, that is considered plausible or reasonably believable.

Worst Case Consequence

A conservative (high) estimate of the consequences of the most severe accident identified. For example, the assumption that the entire contents of a contained volume of toxic material is released to the most vulnerable area in such a way (all at once or continuous) as to have the maximum effect on...

Worst Case

A conservative (high) estimate of the consequences of the most severe incident identified.

Workforce involvement

A PSM program element that consists of a series of work activates that (1) solicit input from the entire work force (including contractors), (2) foster a consultative relationship between management and workers at all levels of the organization, and (3) help sustain a strong process safety culture.

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