Lock Out - Tag Out

 

Overview
Lockout/tagout is an important part of confined space entry. Locks and tags are used to prevent accidental start-up of equipment while you are in a confined space. Steam, water, gas, or power lines that enter the confined space, and mechanical equipment must all be locked out and tagged before you enter the space.

Before entry into such spaces, the entire space should be removed from service and completely protected against the release of energy and material into the space.

Lockout/tagout Procedures
Employers must evaluate the confined space to determine if any equipment or lines need to be locked out and tagged. A pre-entry permit or checklist, a part of the confined space entry plan, must be completed before workers enter the confined space.

All pumps and lines which may reasonably cause contaminants to flow into the space must be disconnected, blinded and locked out, or effectively isolated by other means, to prevent development of dangerous air contamination or engulfment. Main power switches to equipment must be locked out at main power panel. Locks must be tagged to inform others that a confined space entry is in process.

If blocking and/or isolation requires entry into the space, the provisions for entry into a confined space must be implemented.

Lockout/tagout Methods
Lockout is the process of turning off and locking out the flow of energy from a power source to a piece of equipment or circuit, and keeping it locked out.

Lockout is accomplished by installing a lockout device at the power source so that equipment powered by that source cannot be operated. A lockout device is a lock, block, or chain that keeps a switch, valve, or lever in the off position.

Locks are provided by your employer and cannot be used for other purposes.
Tagout is accomplished by placing a tag on the power source. The tag acts as a warning not to restore energy—it is not a physical restraint. Tags must clearly state: Do not operate or remove this tag or the like, and must be applied by hand.

The employer’s primary tool for providing protection is the energy-isolating device. This is the mechanism that prevents the transmission or release of energy and to which all locks or tags are attached. This device guards against accidental machine or equipment start-up or the unexpected reenergization of equipment during servicing or maintenance.

To avoid confusion and an accidental removal of a lock or tag when a confined space entry is in progress your company must have a lockout/tagout plan. Know the plan and never violate it for any reason.