scope:

PURPOSE

The purpose of this Marshall Work Instruction (MWI) is to ensure employees, performing service/maintenance on equipment/systems, are not exposed to and do not receive injuries from the unexpected energization, start-up, or release of stored energy by placing the equipment/system in a zero-energy state and rendering the equipment/systems inoperative by the placement of lockout and tagout devices before the service/maintenance is performed.

APPLICABILITY

The requirements in this MWI are applicable to all MSFC organizations including onsite and offsite contractors performing service/maintenance activities at MSFC where an employee can be injured by the start-up or release of stored energy. These are minimum requirements for equipment/systems operating at 600 volts and less. The Facilities Management Office (FMO) can provide information on the additional safety measures required for equipment/systems operating over 600 volts.

There shall be no exceptions to the safe practices required by the energy-control requirements contained in this MWI for work performed on MSFC equipment/systems.

These are the minimum energy-control or lockout/tagout (LO/TO) requirements for equipment/systems operating between 50 and 600 volts. The FMO can provide information on the additional safety measures required for equipment/systems operating over 600 volts.

This MWI shall apply to the control of energy in all of the following conditions:

Service/maintenance activities taking place during normal production operations are covered by this MWI only if:

An employee is required to remove or bypass equipment/system guards or other safety devices.

An employee is required to place any part of their body into an area on a piece of equipment/system where work is actually performed upon material being processed (point of operation), or where an associated danger zone exists during an operating cycle.

An employee is lubricating, cleaning, unjamming, making adjustments, tool changes, or servicing equipment/systems, where the employee can be exposed to the unexpected energization, start-up, or the release of hazardous energy.

Any equipment/system safeguard is rendered ineffective while an employee is exposed to hazardous portions of the equipment/system and a possibility exists for the reenergization or the release of hazardous energy.

This MWI does not apply to the control of energy in the following conditions:

Service/maintenance activities when employees are not working in the danger zone/point of operation and exposed to the unexpected start-up or equipment/system energization or the release of any stored hazardous energy.

Service/maintenance activities such as minor tool changes and adjustments that are routine, repetitive, and integral to the use of the equipment and conducted during normal production operations are not regulated by 29 CFR Part 1910.147, if the safeguarding provisions of 29 CFR Part 1910 Subpart O (1910.211-219) and Subpart S (1910.301-335) or other applicable portions of 29 CFR Part 1910 are implemented to prevent worker exposure to the hazards created by the unexpected energization or startup of the equipment/system.

Service/maintenance activities performed on electric equipment connected to the energy source by a cord and the plug is under the exclusive control in accordance with section 5.14 of the employee performing the service/maintenance.

Hot tap operations involving transmission and distribution systems for substances such as gas, steam, water, or petroleum products when performed on pressurized pipelines provided it has been demonstrated that:

Continuity of service is essential.

Shutdown of the system is impractical.

Documented procedures are followed.

Special equipment is used that provides proven effective protection for employees.

Facilities under the exclusive control of electric utilities for the purpose of power generation, transmission, and distribution, including related equipment for communication or metering: The exposure of employees to electrical hazards from work on, near, or with conductors or equipment in electric utilization installations is regulated by 29 CFR Part 1910.269 and 301 through 335.

Employees exposed to the hazards of contacting energized electrical conductors and circuit parts (exposure to electric current) shall be protected by implementing the safety requirements in 29 CFR Part 1910.301 through 335 and MWI 8715.1.