September 2024 | AIChE

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September 2024

Repeat-back

A method of communication that requires the receiver to repeat the message back to the sender to validate that the appropriate message was received.

Repair Time

The time necessary to identify and repair a fault. The average detection and repair time is called the MTTR. Dimension (Time).

Remaining Life

An estimate, based on inspection results, of the time it will take for an equipment item to reach a defined retirement criterion (e.g., minimum wall thickness).

Reliability-Centered Maintenance (RCM)

A systematic analysis approach for evaluating equipment failure impacts on system performance and determining specific strategies for managing the identified equipment failures. The failure management strategies may include preventive maintenance, predictive maintenance, inspections, testing, and/...

Reliability Parameters

The collection of mathematically defined properties (e.g., Reliability, Availability, Dependability) used in reliability engineering to describe the behavior of systems and their elements, such as chemical processes, process systems, equipment and their components. (See Appendix E.)

Reliability Analysis

The determination of reliability of a process, system, or equipment.

Reliability

Core attribute of a protection layer related to the probability that the equipment operates according to its specification for a stated period of time under all relevant conditions.

Related criteria

Audit criteria derived from good, successful, common, or best practices in PSM that are not considered compliance issues, but supplement and improve a PSM program that meets the minimum compliance requirements. The evaluation of PSM management systems and the internal controls they impose are...

Refrigerated Liquid

A gas that is maintained as liquid at temperatures at or below ambient temperature to reduce the storage pressure. This includes fully refrigerated LP-Gas for pressures near atmospheric pressure but not exceeding 15 psi (103 kPa) and semi refrigerated LP-Gas for pressures above 15 psi (103 kPa). (...

Reflux

A system condition in which a component in the reaction system (usually a solvent or diluent) is continuously boiled off, condensed in a nearby condenser and subsequently re-supplied to the reaction system. Reflux is often applied to operate at a preset temperature or to avoid operating at...

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