September 2024 | AIChE

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September 2024

Fire Triangle

Three basic conditions are required for fire to take place. These are fuel, oxygen, and heat.

Fire Protection

Methods of providing for fire control or fire extinguishment. (NFPA 850)

Fire Point

The minimum temperature at which a flammable or combustible liquid, as herein defined, and some volatile combustible solids will evolve sufficient vapor to produce a mixture with air that will support sustained combustion when exposed to a source of ignition, such as a spark or flame.

Fire

A combustion reaction accompanied by the evolution of heat, light, and flame.

Finding

A conclusion reached by the audit team based on data collected and analyzed in response to a specific audit question which indicates a need for improvement in the PSM program design or implementation. Findings are sometimes also referred to exceptions. Although strictly speaking a finding can be a...

Final Element

Process control or safety device that implements the physical action necessary to achieve or maintain a safe state; e.g., valves, switch gear, and motors, including their auxiliary elements (such as the solenoid valve used to operate a valve).

Feedback Control

A method by which one or more controlled variables (i.e., pressure, temperature, current, speed, power) are made to obey a common signal, whether constant or varying, according to a prescribed law, as a result of the measurement of the variable(s) in questions.

Fault Tree Analysis

A method used to analyze graphically the failure logic of a given event, to identify various failure scenarios (called cut-sets), and to support the probabilistic estimation of the frequency of the event.

Fault tree

A logic model that graphically portrays the combinations of failures that can lead to a specific main failure or accident of interest.

Fault Tolerant

A system where some parts may fail but the system will still execute properly. A control system configuration that inherently provides auto selection of alternate or redundant signal paths to effect uninterrupted operations.

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