Lock Out, Tag Out (LOTO)

Lock Out, Tag Out (LOTO)

Lock Out, Tag Out (LOTO), Lock Out, Tag Out, Try Out (LOTOTO) or lock and tag is a safety procedure used in industry and research settings to ensure that dangerous machines are properly shut off and not able to be started up again prior to the completion of maintenance or repair work. 

It requires that hazardous energy sources be "isolated and rendered inoperative" before work is
started on the equipment in question.

The isolated power sources are then locked and a tag is placed on the lock identifying the worker who placed it.

The worker then holds the key for the lock, ensuring that only he or she can remove the lock and start the machine.

This prevents accidental startup of a machine while it is in a hazardous state or while a worker is in direct contact with it

Disconnecting or making safe the equipment involves the removal of all energy sources and is known as isolation.

The steps necessary to isolate equipment are often documented in an isolation procedure or a lockout tagout procedure.

1.Announce shut off

2.Identify the energy source(s)

3.Isolate the energy source(s)

4.Lock and tag the energy source(s)

5.Prove that the equipment isolation is effective

The locking and tagging of the isolation point lets others know not to de-isolate the device.

To emphasize the last step above in addition to the others, the entire process can be referred to as lock, tag, and try (that is, trying to turn on the isolated equipment to confirm it has been de-energized and cannot operate)

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