September 2024 | AIChE

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September 2024

Standby Mode

Hardware operation that is normally not running but must be ready run, e.g., an emergency diesel generator.

Standards

The PSM program element, Compliance with Standards, that helps identify, develop, acquire, evaluate, disseminate, and provide access to applicable standards, codes, regulations, and laws that affect a facility and/or the process safety requirements applicable to a facility. More generally,...

Standard Deviation (cloud concentration), s

The square root of the sum of squared values of concentration minus centerline concentration. The cloud half-width can be defined as the distance corresponding to a concentration of two or three standard deviations from the centerline.

Stakeholder Outreach

A PSM program element associated with efforts to (1) seek out and engage stakeholders in a dialogue about process safety; (2) establish a relationship with community organizations, other companies and professional groups, and local, state, and federal authorities; and (3) provide accurate...

Stakeholder Outreach

CCPS RBPS Element 05: This Element promotes interactions with the facility's neighbors, including communications of how the facility manages its process safety risks.

Stakeholder

Individuals or organizations that can (or believe they can) be affected by the facility's operations, or who are involved with assisting or monitoring facility operation.

Stable Materials

Those materials that normally have the capacity to resist changes in their chemical composition, despite exposure to air, water, and heat as encountered in fire emergencies. (NFPA 704 2001)

Stable Detonation

A detonation that progresses through a confined system without significant variation of velocity and pressure characteristics. For atmospheric conditions, typical velocities range between 1600 and 2200 m/s for standard test mixtures and test procedures.

Stabilized Burning

Steady burning of a flame, stabilized at, or close to the flame arrester element.

Stability Class

The Pasquill stability class scheme is based on time of day, wind speed, cloudiness, and sun's intensity. The six stability classes are denoted by the letters A through F, with A being very unstable, D being neutral, and F being very stable

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