Basic Lockout/Tagout Steps
Step 5: Lockout or Tagout Device Application
Lockout
A lockout device is applied after the operating controls have been turned off or returned to the "safe" or "off" position. The energy-isolating device must be operated in such a way that it completely isolates the energy source(s) from the equipment or machinery it controls.
For most energy-isolating devices, this means:
- Electrical disconnect switches: The lockout device should ensure that the switch remains in the "off" or "open" position.
- Valves for gas or liquids: The lockout device must keep the valve in the fully "closed" position to prevent flow.
- Mechanical devices: The lockout device should prevent any movement or release of stored energy (e.g., springs, weights).
The key principle is that the lockout device must physically prevent the energy-isolating device from being operated, ensuring worker safety.
Tagout
Tagging out is a procedure for placing a warning tag or sign - a tagout device - on an energy-isolating device. Remember, tagout devices must control hazardous energy at least as effectively as lockout devices.
Bottom line: If you can lock it out, do not use tags.
- 1910.147(d)(4)(i) Lockout or tagout devices shall be affixed to each energy isolating device by authorized employees.
- 1910.147(d)(4)(ii) Lockout devices, where used, shall be affixed in a manner that will hold the energy isolating devices in a "safe" or "off" position.
- 1910.147(d)(4)(iii) Tagout devices, where used, shall be affixed in such a manner as will clearly indicate that the operation or movement of energy isolating devices from the "safe" or "off" position is prohibited.
- 1910.147(d)(4)(iii)(A) Where tagout devices are used with energy isolating devices designed with the capability of being locked, the tag attachment shall be fastened at the same point at which the lock would have been attached.
- 1910.147(d)(4)(iii)(B) Where a tag cannot be affixed directly to the energy isolating device, the tag shall be located as close as safely possible to the device, in a position that will be immediately obvious to anyone attempting to operate the device.
Knowledge Check Choose the best answer for the question.
6-4. Lockout devices must secure energy-isolating devices _____.
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