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LOTO

LOTO — Lockout Tagout

A safety procedure used to isolate hazardous energy sources before maintenance or servicing work begins.

Definition

Lockout/Tagout (LOTO) is a safety procedure that prevents the unexpected release of hazardous energy by isolating equipment and securing energy-isolating devices with locks and warning tags before maintenance, inspection or servicing activities are performed. It protects personnel by ensuring equipment cannot be energized until all work has been completed and authorized.

Why It Matters

Lockout/Tagout is a fundamental safety control that protects personnel from hazardous energy during maintenance and operational activities.

In Practice

LOTO procedures typically address electrical, mechanical, hydraulic, pneumatic, thermal, chemical and other stored energy sources. Specific requirements vary by jurisdiction and organizational safety procedures.

Common Misuse

Lockout/Tagout isolates hazardous energy before work begins, whereas Permit to Work authorizes and controls the overall work activity.

Term Details
Synonyms:
LOTO; Lockout/Tagout; Energy Isolation; Hazardous Energy Control
Classification:
Process Safety
Methodology
Intermediate
Applications

Safety Management; Maintenance; Operations.

Where It's Used

Manufacturing.; Oil and gas.; Petrochemical.; Utilities.; Construction.

References

OSHA 29 CFR 1910.147

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