September 2024 | AIChE

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September 2024

Intrinsic Property

In relation to materials, a property of the material itself, regardless of use or environmental conditions.

Interview

Questioning, both formally and informally, facility personnel or other individuals in order to obtain an understanding of the plant's operations and performance.

Internal Failure

A failure involving either the hardware or the software of the Process Control System, excluding the Application Program.

Internal Controls

The various engineering and managerial means, both formal and informal, established within an organization to help the organization direct and regulate its activities in order to achieve desired results; also refers to the general methodology by which specific management processes are carried on...

Internal Boundary Layer

A transition layer rising downwind of a change of surface roughness, which separates the air below, which has adjusted to the new surface, from the air above, which is still influenced by the old upwind surface. The internal boundary layer has an average slope of about 1/100 to 1/10.

Intermediates

Materials from a process that are not yet completely finished product. They may be a mixture or compound.

Intermediate Event

An event that propagates or mitigates an initiating (basic) event during the accident sequence (e.g., improper operation actions, failure to stop an ammonia leak but an emergency plant mitigates the consequences).

Interlock System

A system that detects out-of-limits or abnormal conditions or improper sequences and either halts further action or starts corrective action.

Interlock

A protective response which is initiated by an out-of-limit process condition. Instrument which will not allow one part of a process to function unless another part is functioning. A device such as a switch that prevents a piece of equipment from operating when a hazard exists. To join two parts...

Intentional chemistry

Processing of substances such that a chemical reaction is intended to take place.

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