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6110
Appendix T1 Lock, Tag,
Try (LTT) Procedure |
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This appendix contains the guidelines for locking and tagging out of hazardous energy sources when maintenance or service work is to be performed. Lock, Tag, Try (LTT) references in this appendix applies to maintenance, service, and construction applications. Refer to ES&H Manual Chapter 6111 Administrative Control Using Locks and Tags for administrative configuration control applications.
NOTE: Management authority may be delegated at the
discretion of the responsible manager.
·
Maintain
appropriate LTT training (SAF 104 Lock, Tag, Try).
·
Obtain specific LTT training on
equipment being serviced.
·
Perform LTT procedure process steps (listed
below) only after authorization from the supervisor of the equipment which
requires the securing of the hazardous energy source.
·
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.
2.3
Subcontracting
Officer’s Technical Representative (SOTR)
· Maintain LTT qualifications. (If they supervise subcontractors who perform
LTT on site.)
·
Provide equipment-specific LTT procedures to
subcontractors on an as needed basis.
· Verify that long-term
service subcontractors are trained as Jefferson Lab Qualified Taggers and that their
training is current.
·
Implement group LTT and act as Group LTT
Coordinator in accordance with ES&H Manual Chapter 6110 Appendix T3 Group Lock, Tag and Try
Procedure if Jefferson Lab employee(s) and subcontractor(s)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.
Only Qualified Taggers may perform the following process steps.
When service or maintenance is to be performed by multiple
Qualified Taggers refer to ES&H Manual Chapter 6110
Appendix T3 Group Lock, Tag, Try (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 Work Control Document
LTT applications
require a written Work Control Document (see ES&H Manual Chapter 3310 Operational Safety
Procedure Program),
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.
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.
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NOTE: It may be more practical and safer to
perform voltage verification before applying locks/tags to the isolation
device. If this is the case secure the
equipment and proceed to Step 6. Once a de-energized state has been
verified, come back to Step 4 and
continue with the LTT
process. |
Step 4: Isolate Energy Sources
· Don appropriate personal
protective equipment (PPE).
·
Secure the equipment:
o
Put all appropriate
energy-isolating devices in a safe state (usually “off”).
·
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 attempt to operate the equipment or
system.)
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NOTE: If the equipment is un-lockable
see 4.2 Special Tag Out Situations Without
Locks |
· 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.
Step
5:
Remove and Release
Potential Energy:
·
Don appropriate PPE.
· Refer to Step 6 for the
removal of stored/residual electrical energies.
· Put all control mechanisms into a safe state and lock controls
where possible.
· Bleed the system of energy.
· Block raised dies, gears, or equipment that could descend or move
when the energy is removed.
· Lower suspended loads to the floor or secure them independently.
· Release any stored spring tension.
· Check the system for possible re-accumulation of stored
energy. Continue this check until the
possibility of re-accumulation no longer exists, or until the LTT is cleared.
Step 6:
Verify Lockout and Try (Attempt
to Restart)
· Don appropriate PPE.
·
Assume the equipment
is energized, or charged, until it has been determined to be de-energized.
· Witness the verification of a de-energized state.
o
All Qualified Taggers
having applied a personal lock and/or tag are required to perform or witness
the verification of the de-energized state (refer to ES&H Manual Chapter 6110 Appendix T3 Group Lock, Tag, Try (LTT)
Procedure for any
exceptions to this step).
·
Verify the integrity
of your lockout
· Try to restart the equipment.
o
Have an authorized employee
attempt to operate the equipment controls, or otherwise verify the equipment
cannot be restarted. Return operating
controls to the safe (usually “off”) position.
AND
For electrical
energies:
·
Test the metering
equipment for proper operation (immediately before verifying a de-energized
state).
·
Verify incoming power
has been de-energized.
·
Test the metering
equipment for proper operation (immediately after verifying a de-energized
state).
·
Remove and release
stored energy:
o
Use a
grounding/shorting stick to dissipate any stored/residual energy.
o
Ground the electrical
components/circuits as required for the duration of the job or task.
o
Verify that the stored/residual
energy has been dissipated.
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NOTE: In the event of a scenario where the energy source is not present during the lockout/tagout, additional safety measures are implemented to eliminate inadvertent energization. These additional steps are performed to ensure that the failure of any energy isolation device does not energize the equipment being worked on. A written and approved Task Hazard Analysis is required under this no-energy lockout scenario, and the approval of the task includes a review from a second individual familiar with the equipment being lockout. |
Step
7:
Perform the Work
·
Periodically re-check
the integrity of the lock and/or tag, minimally:
o When there is a possibility of energy build up.
o When tasks last more than one shift.
Step 8:
Prepare to
Re-Energize
· Ensure the equipment has been properly re-assembled:
o
Electrical jumpers and
grounds, tools, work aids, spare parts and other such devices have been
collected and removed, and
o
Personnel have moved
to safe positions.
· Close all cabinets and panels completely.
· Notify all affected individuals when work is complete and ready
for energizing.
· Ensure equipment/control switches are in a safe state (usually
“off”). This will:
o
Avoid unexpected
startup.
o
Prevent inadvertent
overload of circuit breakers and switches.
o
Ensure safe start-up
sequencing.
Step 9:
Remove Locks and Tags
· Each Qualified Tagger removes their lock(s) and/or tag(s). (Refer to ES&H Manual Chapter
6110 Appendix T2 Special Lock and Tag Removal Procedure, for any exceptions
to this step.)
Step 10: Energize
· Be prepared to shutdown the equipment immediately if needed. Enlist the help of others as necessary.
· Test equipment to verify proper operation.
·
If testing indicates
the equipment must undergo LTT again, go back to Step 3.
4.0
Exceptions
to the Use of a Lock and/or Tag
4.1
Cord &
Plug - electrical equipment
LTT requirements do not apply to electrical equipment
that is equipped with cords and receptacle plugs if removing the plug
completely de-energizes the equipment and the plug is under exclusive control
at all times. Unload the equipment prior
to unplugging the cord-and-plug. If
these conditions cannot be guaranteed, then LTT
measures are required.
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NOTE: There are lockable “boots” available to secure electrical plugs. |
4.2
Special Tag Out Situations Without Locks
Jefferson Lab, in accordance with OSHA and NFPA 70E
standards, permits the use of tags alone in certain limited situations. To be a candidate for a tag-only control, an
energy source must meet all of the following criteria:
· Equipment design precludes the installation of a lock on an energy
isolation device(s).
· At least one additional safety measure is employed that provides a
level of safety equivalent to that obtained by use of a lock.
· The LTT procedure to be used is documented in a work control document.
5.0
Revision Summary
Revision 1.2 – 09/10/12 – Removed
Special Lock-out Situations without Tags in response to CATS item
MOA-2012-19-01-01.
Revision 1.1 – 12/01/11 - Clarification of process steps and updates made to format. Qualifying periodic review, no substantive changes required.
Revision 1 – 04/04/09 – Update to reflect current laboratory operations.
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ISSUING
AUTHORITY |
TECHNICAL POINT-OF-CONTACT |
APPROVAL
DATE |
EXPIRATION
DATE |
REV. |
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ESH&Q Division |
04/04/09 |
12/01/14 |
1.2 |
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