September 2024 | AIChE

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September 2024

Lethal Concentration (LC )

A concentration of a substance being tested which will kill a test animal.

Lessons Learned

Applying knowledge gained from past incidents in current practices.

Learn from Experience

CCPS RBPS Pillar IV: Its four Elements are used to identify and correct incident and audit deficiencies, and share lessons learned and best practices with other organizations.

Leading Metric

A forward-looking set of metrics that indicate the performance of the key work processes, operating discipline, or layers of protection that prevent incidents.

Leading Indicator

Process-oriented metrics, such as the degree of implementation or conformance to policies and procedures, that support the PSM program management system and has the capability of predicting performance.

Layout

The relative location of equipment or buildings within a given site.

Layers of Protection

A concept whereby several independent devices, systems, or actions are provided to reduce the likelihood and severity of an undesired event.

Layer of Protection Analysis (LOPA)

An approach that analyzes one incident scenario (cause-consequence pair) at a time, using predefined values for the initiating event frequency, independent protection layer failure probabilities, and consequence severity, in order to compare a scenario risk estimate to risk criteria for determining...

Layer Ignition Temperature (LIT)

The minimum temperature at which a dust layer will self-heat.

Law of "Conservation of Energy"

Second law of thermodynamics that states that energy can only change in form, but can never be "lost" or "created".

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