Lockout Tagout (LOTO) is a safety procedure used to isolate hazardous energy sources and prevent machines or equipment from being accidentally started during maintenance or servicing. It involves using physical lockout devices, such as safety padlocks lockout tagout, to secure energy isolation points. LOTO ensures that only authorized personnel can restore power, protecting workers from injuries caused by unexpected equipment activation.

The purpose of Lockout Tagout is to protect workers from hazardous energy, including electrical, mechanical, hydraulic, and pneumatic sources, during maintenance operations. By physically locking energy isolation points and clearly identifying them with warning tags, LOTO prevents accidental startup or energy release. This significantly reduces workplace injuries and ensures compliance with industrial safety standards.

Lockout Tagout is used during equipment maintenance, repair, cleaning, or inspection when there is a risk of unexpected energization. It is widely applied in industries such as manufacturing, oil & gas, power generation, and chemical processing. LOTO systems typically include safety padlocks, lockout hasps, valve lockouts, and electrical lockout devices to secure different types of energy sources.

The standard Lockout Tagout procedure typically includes six steps: preparation, shutdown, isolation, lockout/tagout application, verification, and maintenance. Workers first identify all energy sources, safely shut down equipment, isolate energy, and apply lockout devices such as safety padlocks. Before starting work, they verify complete isolation to ensure the equipment cannot be energized.

The correct Lockout Tagout procedure requires identifying all hazardous energy sources, shutting down equipment properly, isolating energy points, and applying lockout devices with personal safety padlocks. Each worker must apply their own lock to ensure full control. The system must then be tested to confirm zero energy before maintenance begins, ensuring maximum safety and compliance.

The final step in a Lockout Tagout process is the safe removal of lockout devices and restoration of equipment to normal operation. This includes verifying that all tools are removed, guards are reinstalled, and all personnel are safely clear. Only authorized employees who applied the locks should remove them, ensuring controlled and safe re-energization.