September 2024 | AIChE

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September 2024

Minimal Cut Set Approach

A term used in Fault Tree Analysis to describe the smallest combination of component and human failures which, if they all occur, will cause the top event to occur. The failures all correspond to Basic or Undeveloped Events.

Minimal Cut Set

The smallest combination of component and human failures which, if they all occur, will cause the top event to occur. The failures all correspond to Basic or Undeveloped Events.

Metrics

Leading and lagging measures of process safety management efficiency or performance. Metrics include predictive indicators, such as the number of improperly performed line-breaking activities during the reporting period, and outcome-oriented indicators, such as the number of incidents during the...

Methodology

The use of a combination of two or more incident investigation tools to analyze the evidence and determine the root causes of the incident.

Median Lethal Dose , LD50

A statistically derived single dose of a chemical that is expected to cause death in 50% of tested animals.

Median Lethal Concentration/Dose

Concentration or dose levels, respectively, that kill 50% of exposed laboratory animals in controlled experiments.

Mechanical Integrity Program

A program to ensure that process equipment and systems are and remain mechanically suitable for operation. It involves inspection, testing, upgrading and repairs of equipment, as well as written procedures to maintain on-going integrity of equipment

Mechanical Integrity

An management system focused on ensuring that equipment is designed, installed, and maintained to perform the desired function.

Measurement and Metrics

CCPS RBPS Element 18: This Element is used to identify process safety metrics based on leading and lagging indicators of the facility's process safety performance.

Mean Time To Repair (MTTR)

The statistical average of time taken to identify and repair a fault. Normally expressed as t. Dimension (Time).

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