September 2024 | AIChE

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September 2024

Integral Model

A dispersion model which averages (or integrates) the concentration in a given dimension or time so that concentrations can be described by solving an ordinary differential equation instead of a partial differential equation.

Instrumented protective system (IPS)

A safety system composed of a separate and independent combination of sensors, logic solvers, final elements, and support systems that are designed and managed to achieve a specified risk reduction.

Inspection, Testing, and Preventive Maintenance (ITPM)

Scheduled proactive maintenance activities intended to (1) assess the current condition and/or rate of degradation of equipment, (2) test the operation/functionality of equipment, and/or (3) prevent equipment failure by restoring equipment condition.

Inspection

A work activity designed to determine if ongoing work activities associated with operating and maintaining a facility comply with an established standard. Inspections normally provide immediate feedback to the persons in charge of the ongoing activities, but normally do not examine the management...

Injury

Physical harm or damage to a person resulting from traumatic contact between the body and an outside agency or exposure to environmental factors.

Initiating Cause

In the context of hazard evaluation procedures, the operational error, mechanical failure, or external event or agency that is the first event in an incident sequence and marks the transition from a normal situation to an abnormal situation. Synonymous with initiating event.

Inhibitor

A chemical which is added to another substance to prevent an unwanted chemical change from occurring. Importance: Inhibitors are sometimes listed on a MSDS, along with the expected time period before the inhibitor is used up and will no longer prevent unwanted chemical reaction.

Inherently Safer Design

A way of thinking about the design of chemical processes and plants that focuses on the elimination or reduction of hazards, rather than on their management and control.

Inherently Safer

A condition in which the hazards associated with the materials and operations used in the process have been reduced or eliminated, and this reduction or elimination is permanent and inseparable.

Inherent Safety

A concept or an approach to safety that focuses on eliminating or reducing the hazards associated with a set of conditions.

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