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Lock out / Tag out
OSHA standard 1910.147, Control of Hazardous Energy or Lock out/Tag out, covers the servicing and maintenance of machines and equipment in which the unexpected energization or start up of the machines or equipment, or release of stored energy could cause injury to employees.
This standard applies to the control of energy during servicing and/or maintenance of machines and equipment outside of normal operations. Maintenance of machines during normal operations is covered by this standard if and only if an employee is required to bypass or remove a guard or other safety device or is required to place any part of his or her body into an area on a machine where work is actually performed upon the processing material. This standard does not apply to work on cord and plug connected electrical equipment for which exposure to the hazards of unexpected energization of the equipment is controlled by the unplugging of the equipment from the energy source and by the plug being under the exclusive control of the employee performing the servicing or maintenance.
Hot tap operations performed on pressurized pipelines involving transmission and distribution systems for gas, steam, or water are also not covered by this standard provided that the operator and maintenance department demonstrates that continuity of the service is essential, shutdown is impractical, and documented procedures are followed, and personal protective equipment is used which will provide effective protection for the employees performing the service.
