September 2024 | AIChE

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September 2024

Apparent cause analysis (ACA)

A less formal investigation method that focuses on the immediate causes of a specific incident.

Apparent Activation Energy

In practice, reaction rates are often determined by physical processes (e.g. mass flow, diffusion, mass transfer area) as well as by chemical processes. The activation energy observed in these cases is called the apparent activation energy.

Antistatic

Having the ability to dissipate charge at a sufficient rate to prevent hazards or nuisances under the conditions of use.

Anomaly

An unusual, abnormal, or irregular set of circumstances that left unrecognized or uncorrected may result in an incident.

ALARP

As Low As Reasonably Practicable The concept that efforts to reduce risk should be continued until the incremental sacrifice (in terms of cost, time, effort, or other expenditure of resources) is grossly disproportionate to the incremental risk reduction achieved. The term As Low As Reasonably...

Aggregation

The statistical combination of several data points to form a single data point and confidence interval.

Aggregate Risk

Societal risk for on-site workers in occupied buildings (API 752).

Administrative Controls

Procedural mechanism for controlling, monitoring, or auditing human performance, such as lock out/tagout procedures, bypass approval processes, car seals, and permit systems.

Administrative control

Procedures that will hold human and/or equipment performance within established limits.

Adiabatic Temperature Rise

Maximum increase in temperature that can be achieved. This increase only occurs when the substance or reaction mixture decomposes completely and at adiabatic conditions.

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