Dissipating Stored Energy
Stored energy must be released after equipment has been de-energized.
Isolating and de-energizing a transformer by grounding.
Below is a list of possible sources of stored energy.
- Capacitors
- Coiled springs
- Elevated machine members
- Rotating fly wheels
- Air, gas, steam, chemical, and water systems
If the energy could return to a hazardous level, make sure that it remains isolated from the equipment until all service work is finished. Below is a list of safe practices for dissipating potential energy.
- Vent pressurized fluids until internal pressure levels reach atmospheric levels.
- Discharge capacitors by grounding them.
- Release or block tensioned springs.
- Ensure that all moving parts have stopped completely.
1910.147(d)
Application of control. The established procedures for the application of energy control (the lockout or tagout procedures) must cover the following elements and actions and must be done in the following sequence:
...
1910.147(d)(5)
Stored energy.
Application of control. The established procedures for the application of energy control (the lockout or tagout procedures) must cover the following elements and actions and must be done in the following sequence:
...
Stored energy.
- 1910.147(d)(5)(i) Following the application of lockout or tagout devices to energy isolating devices, all potentially hazardous stored or residual energy must be relieved, disconnected, restrained, and otherwise rendered safe.
- 1910.147(d)(5)(ii) If there is a possibility of reaccumulation of stored energy to a hazardous level, verification of isolation must continue until the servicing or maintenance is completed, or until the possibility of such accumulation no longer exists.
Knowledge Check Choose the best answer for the question.
6-5. Lockout devices must secure energy-isolating devices _____.
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