The Control of Hazardous Energy (Lockout/ Tagout) 1910.147

The Control of Hazardous Energy(Lockout/Tagout) 1910.147

Standard ImplementationJanuary 1990In response to:

Caused Annually By Improper Shutdown of Machinery

Scope, Application & PurposeThis standard 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.

Establishes minimum performance requirements

Scope, Application & PurposeDoes Not Cover:Construction, agriculture, maritime (29 CFR 1910.20 & 21)Power generation, transmission, distribution (29 CFR 1910.269)Electrical hazards covered in Subpart S (Electric 29 CFR 1910.331 & OAC 4121:1-5-23)Oil & gas well drilling and servicing

Scope, Application & PurposeStandard Does Not Apply To:

Work on cord and plug connected electric equipment (unplug & plug is under exclusive control of employee)Hot tap operations

Scope, Application & PurposeStandard applies during servicing or maintenance of equipment

Normal production operations are not covered by this standard.

Normal Production Operations are routine, repetitive, and integral to the production operation. Short in duration, occur frequently, do not involve extensive disassembly. The employer must implement alternative measures, which provide effective protection from hazards.

Subpart O - Machinery and Machine Guarding

Scope, Application & PurposeServicing and/or maintenance during normal production operations is covered if:

Remove or bypass a guard or other safety deviceRequired to place any part of his or her body into the point of operation or an associated danger zone exists during a machine operating cycle.

DefinitionsAffected employee - His/her job requires him/her to work in an area where lo/to (servicing or maintenance) is being performed.

Authorized employee - Locks or tags out machines or equipment to perform servicing or maintenance.

Other employees - All other employees.

DefinitionsEnergy Isolating Device - Mechanical device that physically prevents the transmission or release of energy (disconnect switch, line valve, manually operated circuit breaker)Lockout Device Device that utilizes a positive means to hold an energy isolating device in a safe position and prevent energization

Energy Control Program 1910.147(c)(1)Employer shall establish a program consisting of:

energy control proceduresemployee training periodic inspections

to ensure that before equipment maintenance is performed, the equipments energy sources are isolated and rendered inoperative.

Energy Control Procedure1910.147 (c)(4)Written Program - Procedures shall be developed, documented and utilized for the control of potentially hazardous energyProcedures shall clearly and specifically outline: ScopePurposeAuthorizationRulesTechniques for the control of hazardous energy

Does Your Companys Lockout Policy Address Violations For Failure to Lockout Equipment?

Protective Materials & Hardware1910.147 (c)(5)The employer shall provide locks, tags, chains, wedges, key blocks, adapter pins, self-locking fasteners, or other hardware

Lockout/tagout devices shall be:a) Identifiableb) Durablec) The only device used for controlling energyd) Not be used for other purposese) Standardizedf) Substantial

Protective Materials & Hardware1910.147 (c)(5)DurableCapable of withstanding the environment for the maximum period of time Tagout devices constructed and printed to withstand wet/damp locations Tags shall not deteriorate when used in corrosive environments (acid and alkali chemicals)StandardizedLockout/tagout devices shall be standardized by: a) Colorb) Shapec) Size d) Print and format (tagout devices)

Protective Materials & Hardware1910.147 (c)(5)SubstantialLockout devices - prevent removal without use of excessive force (bolt cutters)Tagout devices - prevent inadvertent or accidental removal. IdentifiableLockout/tagout devices indicate the identify of the employee applying the device(s).

Protective Materials & Hardware1910.147 (c)(5)Tagout attachment: a) non-reusable b) attachable by handc) self-lockingd) non-releasable e) unlocking strength > 50 pounds ** equivalent to an all environment- tolerant nylon cable tieTagout devices include a legend such as the following: Do Not Start. Do Not Open. Do Not Close. Do Not Energize. Do Not Operate.

Protective Materials & Hardware1910.147 (c)(5)

Protective Materials & Hardware1910.147 (c)(5)

Full Employee Protection1910.147 (c)(3) TAGOUT PROGRAMUse of a tagout device on a lockable energy isolating device Tagout device attached at the same location as the lockout device Employer shall demonstrate that the tagout program will provide a level of safety equivalent to that obtained by using a lockout program.

Energy Control Procedure1910.147 (c)(4)Multiple Energy Source EquipmentThe means to enforce compliance including:a) Specific statement of intended useb) Specific steps for shutting down, isolating, blocking and securing equipmentc) Steps for the placement, removal and transfer of devices and the responsibility for themd) Requirements for testing equipment to determine and verify the effectiveness of lockout/tagout devices

Energy Isolation 1910.147 (c)(8)Lockout/tagout shall be performed only by the authorized employees who are performing the servicing or maintenance.Notification of Employees1910.147(c)(9)Affected employees shall be notified by the employer or authorized employee Notification shall be given before the controls are applied, and after they are removed from the machine or equipment.

Equipment Shutdown1910.147(d)(1-3)Lockout/tagout procedures shall cover the following elements which will be done in the following sequence:Preparation for shutdown - authorized employee has knowledge of type and magnitude of the energy, hazards and method to control the energy Equipment shutdown - orderly shutdownEquipment isolation - energy isolating devices to be physically located and operated

Lockout Device Application1910.147(d)(4)LO devices to be attached by authorized employees.LO devices will hold the energy isolating devices in a "safe" or "off" position.

All potentially hazardous stored or residual energy shall be relieved, disconnected, restrained, and otherwise rendered safe.Stored Energy 1910.147(d)(5)

Verification of Isolation1910.147(d)(6)Prior to starting work on equipment that have been locked/tagged out, the authorized employee shall verify that isolation and deenergization of the machine or equipment have been accomplished.

Release From Lockout or Tagout1910.147 (e)(1-2) Before lockout/tagout devices are removed the following actions must be taken:Work area inspected for tools, parts, equipment componentsWork area checked to ensure employees are in a safe locationNotify affected employees of removal of LO/TO

Periodic Inspection1910.147 (c)(6)Employer shall conduct a periodic inspection of the energy control procedure at least annually The inspection is performed by an authorized employee other than the one(s) utilizing the energy control procedure being inspected.The inspection shall be conducted to correct any deviations or inadequacies identified

Periodic Inspection 1910.147 (c)(6)Inspection shall include a review of each employee's responsibilities Employer shall certify that the periodic inspections have been performedCertification to include:a) Identity of the machine or equipment b) Date of the inspectionc) Employees included in the inspectiond) Person performing the inspection.Note: Refer To Handout Page 43 Appendix H

Training & Communication1910.147 (c)(7)The employer shall provide training The training shall include the following: a) Authorized employees - recognition, type and magnitude, and methods/means for energy isolation and control.b) Affected employees - purpose and use of the energy control procedure.c) Other employees - about the procedure and the prohibition of restarting or reenergizing locked out equipment

Training & Communication1910.147 (c)(7)Employee retraining shall be provided for all authorized and affected employees when: a) A change in their job assignmentsb) A change in machines, equipment or processes that present a new hazardc) A change in the energy control procedures.

Training & Communication1910.147 (c)(7)Retraining shall also be conducted when a periodic inspection reveals that there are deviations from or inadequacies in the employee's knowledge or use of the energy control procedures.

Employer shall certify that training has been accomplished and is being kept up to date

Lockout Device Removal1910.147 (e)(3)Each device shall be removed by the employee who applied the device. Exception: If authorized employee is not available to remove device then device may be removed under the direction of the employer Employer must provide specific documented procedures and training for device removal

Lockout Device Removal1910.147 (e)(3)Procedure shall include the following elements: Verification by the employer that the authorized employee who applied the device is not at the facilityMaking all reasonable efforts to contact the authorized employee Ensuring that the authorized employee knows that the device was removed before resuming work at that facility

Testing/Positioning of Equipment1910.147(f)(1)Testing or positioning of equipment when devices must be removed - the following sequence of actions shall be followed:Clear the equipment of tools and materialsRemove employees from the equipment Remove the lockout/tagout devices Energize and proceed with testing/positioning Deenergize and reapply energy control measures

Outside Personnel1910.147(f)(2)Contractors, outside service personnel, etc.The on-site employer and the outside employer shall inform each other of their respective lockout or tagout procedures.The on-site employer shall ensure that his/her employees understand and comply with the restrictions and prohibitions of the outside employer's energy control program.

Group Lockout/Tagout1910.147(f)(3)Service or maintenance performed by a crew, craft, department or other group, shall utilize a procedure which affords all the employees a level of protection equivalent to that provided by the implementation of a personal lockout or tagout device

Shift or Personnel Changes1910.147(f)(4)Specific procedures for shift or personnel changes including provision for the orderly transfer of lockout or tagout device protection between off-going and oncoming employees, to minimize exposure to hazards from the unexpected energization or start-up of the machine or equipment, or the release of stored energy.

Associated Hazards

ANSI/ASSE Z244.1-2003Control of Hazardous EnergyIdentifies acceptable alternative methods for controlling energyHas sample procedures for printing presses, plastics, robotic systems

Case Study : Automotive Robotics

Parts are transferred by a rotating tables from station to station while greasing and other operations are performed on the parts by robots. Employees can gain access to the robots by entering the cages through electrically interlocked gates. When the gates are opened, the energy sources that power the robots, rotating tables, and related machinery are turned off But are not deenergized or locked out.

An employee entered the robot cage without deenergizing or locking out any equipment.

The employee was attempting to unjam a robot arm. In freeing the arm, the employee tripped an electric eye, causing the robot arm to cycle. The employee's arm was struck by the robot and injected with grease.Case Study : Automotive Robotics

Case Study : Automotive RoboticsDoes the unjamming operation take place during normal production operations? YES NO

Case Study : Automotive RoboticsNo. The unjamming operation does not take place during normal production operations. The operation takes place while the robot is shut down and the robot is not performing its intended production function. By opening the gate and entering the fenced area, the employee is bypassing the safety device and exposing himself to injury from the unexpected start up of the equipment.

Case Study : Automotive RoboticsIn this situation, would the interlocked gate alone satisfy the employer's Lockout/Tagout obligations?

YES No. The interlocked gate would not meet the requirements for an energy isolation device. In this case, the interlocked gate is considered to be control circuitry which is expressly prohibited by the rule. It does not protect employees who are inside the fenced area because it fails to de-energize the robot arm.

Case Study 4: Automotive Component Lubrication Robotics