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Operating Limit

A defined boundary that specifies the maximum or minimum permissible value of an operating parameter.

Definition

An Operating Limit is a defined maximum or minimum value for an operating parameter such as pressure, temperature, flow, level or vibration beyond which equipment performance, integrity or safety may be compromised. Operating Limits are established to protect personnel, equipment, product quality and the environment during normal and abnormal operating conditions.

Why It Matters

Operating Limits define the boundaries that maintain safe and reliable operation of equipment and processes.

In Practice

Operating Limits are established through equipment design, engineering analysis, operating experience and process safety studies, and are monitored to support safe plant operation.

Common Misuse

An Operating Limit defines an individual operating boundary, whereas an Operating Envelope encompasses the full range of acceptable operating conditions.

Term Details
Synonyms:
Operating Limit; Operating Boundary; Process Limit; Safe Operating Limit
Classification:
Process Control
Concept
Intermediate
Applications

Process Engineering; Operations; Process Safety.

Where It's Used

Process plants.; Petrochemical.; Oil and gas.; Manufacturing.; Power generation.

References

API RP 584

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