September 2024 | AIChE

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Technical Groups

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September 2024

Average Concentration

The concentration averaged over time and/or space.

Availability

The fraction of time that the system is capable of performing its required functions. The fraction of time a system is fully operational.

Autoxidation

Also autooxidation or auto-oxidation. A slow, easily initiated, self-catalyzed reaction, generally by a free radical mechanism, between a substance and atmospheric oxygen. Initiators of autoxidation include heat, light, catalysts such as metals, and free radical generators. Davies (1961) defines...

Autoignition temperature

The lowest temperature at which a fuel/oxidant mixture will spontaneously ignite under specified test conditions.

Autodecomposition Temperature

The minimum temperature for a specified test method, test apparatus (including material of construction and test volume) and initial pressure required to initiate self-sustained decomposition of a solid, liquid or gaseous substance without any other apparent source of ignition and without air or...

Autodecomposition

The sustained decomposition of a substance without introduction of any other apparent ignition source besides thermal energy and without air or other oxidants present. Autodecomposition is the result of a thermal self-decomposition reaction for given initial conditions (temperature, pressure,...

Autocatalysis

The increase of the rate of reaction due to the catalyzing effect of the reaction products. (HSE 2000)

Authority Having Jurisdiction

The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure.

Auditing

CCPS RBPS Element 19: This Element is the system used to schedule, perform, and document periodic audits of the CCPS RBPS Elements, including tracking corrective actions to closure.

Auditability

The ability to inspect information, documents, and procedures that demonstrate the adequacy of and adherence to the design, inspection, maintenance, testing, and operation practices used to achieve the other core attributes.

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