ES&H Manual



6110 Appendix T3

Group Lock, Tag, Try (LTT) Procedure



1.0            Purpose


This procedure provides members of a group a way to secure hazardous energy sources with protection equivalent to that provided by the individual procedure outlined in ES&H Manual Chapter 6110 Appendix T1 Lock, Tag, Try (LTT) Procedure.


2.0            Responsibilities

NOTE:           Management authority may be delegated at the discretion of the responsible manager.


2.1              Anyone at Jefferson Lab

·         Recognize and respect LTT measures.

·         Do not remove any lock or tag except those meeting the criteria outlined within ES&H Manual Chapter 6110 Appendix T2 Special Lock and Tag Removal Procedure.


2.2              Qualified Tagger

·         Maintain appropriate LTT training (SAF 104 Lock, Tag, and Try).

·         Obtain specific LTT training on equipment being serviced.

·         Perform Group LTT process steps (listed below)

2.3              Supervisor

·         Only assign Qualified Taggers, and provide equipment-specific LTT training, for equipment under your authority.

·         Maintain familiarity with Jefferson Lab's LTT programs and procedures. (If you supervise employee(s) who use LTT procedures.)

·         Perform inspections for compliance with lock and tag procedures as part of regular supervisory oversight.


2.4              Subcontracting Officer’s Technical Representative (SOTR)

·         Be a Qualified Tagger. (If you supervise subcontractors who perform LTT on site.)

·         Provide equipment-specific LTT procedures to subcontractors on an as needed basis.

·         Implement group LTT and act as Group LTT Coordinator in accordance with this procedure (if Jefferson Lab employee(s) and subcontractor(s) are concurrently working on the same equipment/system).

·         Review and approve subcontractors’ Lockout/Tagout program. Ensure that: 

o   Construction – subcontractors’ program meets or exceeds the requirements of OSHA 29 CFR 1926 Construction Industry Regulations, when doing construction type work activities.

o   Maintenance subcontractors’ program meets or exceeds the requirements of OSHA 29 CFR 1910 General Industry Regulations, when doing service or maintenance on machines or equipment.


2.5              Group LTT Coordinator

·         Be a Qualified Tagger.

·         Account for all persons assigned to the work.

·         Ensure all energy sources are under LTT.

·         Ensure all process steps of the Group LTT procedure, outlined below are properly carried out.


3.0            Process Steps


Unless otherwise stated within this procedure, the Group LTT Coordinator performs the process steps listed below.


3.1              Group LTT Procedure


Step 1:             Determine the Hazards

Perform or review the work’s Task Hazard Analysis.

·         Evaluate the type and magnitude of the potentially hazardous energy, and the means of controlling the energy.

·         Review specific equipment, written procedures, blueprints, system diagrams, valve lineups, and operating manuals.

·         Confer with people who know the equipment.

·         Be alert to multiple energy sources.

·         Do not proceed until knowledge of the hazard(s) are known


Step 2:             Determine the need for a Written Procedure:

LTT applications require a written procedure, unless all of the following elements exist:

·         The equipment has no potential for residual, stored, or the re-accumulation of stored, energy after shutdown.

·         The equipment has a single energy source which can be readily identified and isolated.

·         The isolation and locking out of the energy source completely de-energizes and de-activates the equipment.

·         The equipment is isolated from its energy source and locked out during servicing and maintenance.

·         A single lock out device will achieve a locked out condition.

·         The lock out device is under exclusive control of the authorized employee performing the servicing or maintenance.

·         The servicing or maintenance procedure does not create hazards for other employees.

·         There is no record of incidents involving the unexpected activation or re-energization of the equipment during servicing or maintenance within Jefferson Lab.


NOTE:  Click here for an optional LTT form that will satisfy the minimal information required to be included in a written LTT procedure (Group LTT Form). Equipment that is similar in its operation can be grouped under one LTT procedure.


Step 3:             Coordinate Work/Notify Others:

·         Notify all affected individuals; inform them that the equipment will be placed out of service until work is completed. Coordinate work with system owners, building managers or safety wardens as deemed necessary.

·         Ensure all potential sources of hazardous energy, including stored/residual energy, are known, documented, and understood.

·         Coordinate the LTT with other system owners who may be affected by the work.

·         Review the job, equipment, and planned processes with all affected groups. 

·         Post the Group LTT Form or the written Group LTT procedure at the area of the group lockout device for the duration of the work.  

Step 4:             Isolate Energy Sources:

·         Identify and locate all energy sources associated with the job.

·         Don appropriate personal protective equipment (PPE).

·         Secure the energy source using a Jefferson Lab approved LTT lock. (A multi-lock hasp is used if there is a possibility that other employees may also work on the equipment or system.)

·         Attach a “Danger” tag.

o   The tag must be:

§  Legible – indicating the identity of the person who applied the device(s).

§  Attached by durable means to the shackle of the accompanied lock, or a non-reusable method capable of withstanding a 50-pound pull, minimally equivalent to a nylon cable tie.  

·         Perform the required tests to verify that all hazardous energy sources have been de-energized.

·         Identify, locate, and remove any potential energy to ensure residual, stored or accumulated energy creates no hazard.

·         Perform the required tests to verify that stored/residual energy has been drained from the system and will not re-accumulate.

·         Record all energy-isolating and energy-draining devices on the Group LTT Form or within the written LTT procedure.


Step 5:             Test LTT Device Applications:

·         Advise all responsible Qualified Taggers that they have a right to personally verify that the hazardous energy sources have been effectively de-energized.


NOTE: The responsible Qualified Tagger who opts to verify the effectiveness of the isolation measures must do so before commencement of work and in the presence of the Group LTT Coordinator.


Step 6:             Lockout Box:

·         Designate a specific location for a lockout box.  Ensure all responsible Qualified Taggers know, and have access to, the location.

·         Place all keys to the locks, used to isolate the energy sources in Step 4, in the lockout box.

·         Lock the lockout box with the Group LTT Coordinator(s)’ lock and tag.

·         Place a copy of the Group LTT Form near the lockout box so it is readily accessible to all responsible Qualified Taggers.


NOTE: A lockout box is one example of a mechanism that can be used during a group lockout situation; other comparable group lockout device mechanisms may also be utilized.


Step 7:             Prior to Commencement of Work:

The bulleted activities below are to be performed by responsible Qualified Taggers

·         Review the Group LTT Form and any other associated procedures.

·         Apply individual locks to the lockout box prior to work.

·         Visually verify the isolation of hazardous energy sources at each location listed on the Group LTT Form or within the written Group LTT procedure to ensure that the integrity of a proper LTT has been achieved (i.e., it must be verified that each lock and tag is physically in place as noted on the Group LTT Form or within the written Group LTT procedure). This action can be accomplished by the Group’s LTT Coordinator(s) on behalf of the Qualified Taggers working on the group lockout.


Step 8:             Shift/Crew Changes:

The group lockout box remains locked at all times until the Group LTT Coordinator(s) determines it is safe to remove the keys (i.e. the Group LTT Coordinator(s)’ lock stays on the box until it is deemed appropriate for removal).

·         Communicate the job-status to affected personnel at the beginning of each shift.

·         Ensure all responsible Qualified Taggers, or the Group’s LTT Coordinator(s) visually verifies the isolation of hazardous energy sources at each location listed on the Group LTT Form or within the written Group LTT procedure at each shift change. This is to ensure that the integrity of the LTT has been maintained (i.e., it must be verified that each lock and tag is physically in place as noted on the Group LTT Form or within the written Group LTT procedure).


NOTE: It is the responsible Qualified Tagger’s lock (the one attached to the lockout box) that gets switched at a shift, or personnel change, not the locks on the equipment.


Step 9:             Job Completion (Group LTT Coordinator):

·         Review the job for completeness to ensure that no one will be endangered by the removal of the lock devices.

·         Notify the system owners that the work is complete and the equipment is ready for re-energizing.

·         Remove the keys from the lockout box and the LTT devices from the equipment.

·         Test equipment to verify proper operation.

·         Complete the Group LTT Form with system verification and depositing.


4.0            Revision Summary


Revision 1.2 – 03/09/15 – Periodic Review; added Group LTT Procedure for determining hazards; deleted Multiple or Single equipment distinction  

Revision 1.1 – 12/01/11 – Clarification of process steps and updates made to format.  Qualifying periodic review, no substantive changes required.

Revision 1.0 – 04/04/09 – Updated to reflect current laboratory operations.











ESH&Q Division

Todd Kujawa





This document is controlled as an on line file.  It may be printed but the print copy is not a controlled document.  It is the user’s responsibility to ensure that the document is the same revision as the current on line file.  This copy was printed on 6/4/2015.