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6110
Appendix T4: LOTO Zero
Voltage and Zero Energy Verification |
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1.0
Purpose
This procedure provides 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 Lockout/Tagout (LOTO) Procedure. The Person in Charge (PIC) or the work planner (or
the qualified worker, if no PIC or work planner) must establish the method for
determining Zero Voltage Verification (ZVV) and Zero Energy Verification (ZEV)
and the appropriate equipment.
Note: Management
authority may be delegated to a task-qualified TJNAF employee at the discretion
of the responsible manager.
2.1
Employees at Jefferson Lab
2.1.1
Recognize and respect Lockout/Tagout
(LOTO)
measures.
2.1.2
Do not remove any lock
or tag except those meeting the criteria outlined within ES&H
Manual Chapter 6110 Appendix T2 Special Lockout/Tagout (LOTO) Procedure.
2.2.1
Maintain appropriate LOTO training (ESC001-
for electrical workers ONLY, ESC007, and ESC008 LOTO Practical).
2.2.2
Obtain specific LOTO training on equipment being
serviced.
2.2.3
Follow specific
guidelines in OSPs and manuals for safe LOTO practices.
2.2.4
Perform Group LOTO
process steps (ES&H Manual Chapter 6110 Appendix T3 Group Lockout/Tagout
(LOTO) Procedure.)
2.3.1
Only assign Qualified Taggers, and provide equipment-specific LOTO training, for equipment under
your authority.
2.3.2
Maintain familiarity
with Jefferson Lab's LOTO programs and procedures. (If you
supervise employee(s) who use LOTO procedures.)
2.3.3
Perform inspections for
compliance with lock and tag procedures as part of regular supervisory oversight.
2.4
Technical
Representative (TR)
2.4.1
Be a Qualified Tagger.
(If you supervise subcontractors who perform LOTO on site.)
2.4.2
Provide equipment-specific
LOTO procedures to subcontractors on an as needed basis.
2.4.3
Implement group LOTO and act as Group
LOTO Coordinator/PIC in accordance with this
procedure (if Jefferson Lab (Jefferson Lab) employee(s) and subcontractor(s) are concurrently
working on the same equipment/system).
2.4.4
If the subcontractor elects to use the Jefferson Lab program,
ensure they perform the following:
2.4.4.1
Complete and maintain appropriate LOTO
training (ESC001- for electrical workers ONLY, ESC007, and ESC008 LOTO
Practical) and equipment specific training.
2.4.4.2
Participate, if requested, in OSHA
required annual Jefferson Lab LOTO review.
2.4.4.3
Undertake corrective actions,
including retraining of staff and subsequent demonstration of proficiency, if Jefferson
Lab or subcontractor observations indicate unsafe or non-compliant performance.
2.4.5
If the subcontractor elects to use their own Lockout/Tagout
program, review their program and approve if:
2.4.5.1
The subcontractors’ program meets or
exceeds the requirements of OSHA 29 CFR 1926 Construction Industry Regulations and
NFPA 70E (2015 Edition),
Article 110.3, Host and Contract Employers’ Responsibilities, when performing construction type work activities.
2.4.5.2
The subcontractors’ program meets or
exceeds the requirements of OSHA 29 CFR 1910 General Industry Regulations and
NFPA 70E (2015 Edition), Article 110.3, Host and
Contract Employers’ Responsibilities,
when doing service or maintenance on machines or equipment.
2.5.1
Be a Qualified Tagger.
2.5.2
Account for all persons
assigned to the work.
2.5.3
Ensure all energy
sources are under LOTO.
2.5.4
Ensure all process steps
of the Group LOTO
procedure, outlined below are properly carried
out.
3.0
Non-Electrical Energy Hazards
3.1 The following list (not all-inclusive) identifies non-electrical hazards for which means to verify zero energy must be identified before applying the LOTO. Sub-bullets in the list are suggestions for ZEV. Section 4.0 provides examples.
3.1.1
Pressurized liquids (hydraulic, pumped)
a.
Pressure gauge
b.
Open drain valve, and apply lock
and tag in the open position
3.1.2 Flooding
source (large volume liquid tank or piping)
a.
Pressure gauge
b.
Open drain valve, and apply lock
and tag in the open position
3.1.3 Compressed
gases (liquefied or pressurized)
a.
Pressure gauge
b.
Open vent valve, and apply lock and
tag in the open position
c.
Gravitational energy (for example, suspended,
hinged loads)
d.
Visual confirmation of
energy-isolating device (lock pin)
e.
Visual confirmation item placed at
ground level
3.1.4 Kinetic
energy (moving robots, linear drives, gears)
a.
Visual confirmation of locking
device (for example, lock pin)
b.
Visual confirmation of
energy-isolation device
3.1.5 Non-ionizing
radiation (radar, microwave, radiofrequency, lasers)—see the Electrical Safety Manual
3.1.6 Thermal
or cryogenic energy (hot >120of, cold temperature <27of)
a.
Temperature gauge or non-contact
infrared thermometer
b.
Pressure gauge
c.
Open drain valve
d.
Visual confirmation of
energy-isolation device
3.1.7 Stored
mechanical energy (springs, elastic seals)
a.
Visual confirmation of isolating
device (for example, lock pin, block, chain)
b.
Visual confirmation of energy being released
3.1.8 Chemical
energy (corrosive, acidic, heat of reaction, fire, explosion, reactive change
in volume, toxic, irritant)
a.
Flushing
b.
Chemical test strips
c.
Open drain valve
d.
Appropriately mitigated with PPE
and monitoring
3.2
Double Barrier Criteria
3.2.1 Using double barriers reduces the risk of exposing workers to hazardous energy. If you do not use double valve isolation, do not rely on one valve exclusively—its seat can leak. Besides a closed valve, have a drain at a low point locked in open position before conducting ZEV.
3.2.2 Regardless of piping size, Jefferson Lab strongly recommends using two-valve isolation to confirm the removal of hazardous energies from piping systems in the following instances when the apparatus is available.
3.2.2.1 High
temperatures (for example, greater than 200oF): open a telltale vent
or drain valve between the isolation valves.
3.2.2.2 High
pressures (for example, greater than 500 psig): open
a telltale vent or drain valve between
the isolation valves.
3.2.2.3 Hazardous
chemicals: purge isolated section before isolation.
3.2.2.4 Any
other system exceeding pressure threshold values but below 200oF and
500 psig, when a pressure gauge and a drain or vent
valve for ZEV of the isolated section is not
available.
3.2.2.5 Radiologically
contaminated water or system.
3.3
If any of these conditions exists
and you cannot provide two-valve isolation, the pressure safety Subject Matter Expert (SME) must review and approve proposed
alternative methods before you add specific controls to the work control
documents or equipment-specific procedure.
4.0
Pressure Thresholds and Valve Blocking/Bleeding
4.1
Double
Block and Bleeding
4.2 External
Upstream and External Downstream Vents
4.3
Pressure Thresholds
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Must Consider Use of LOTO |
LOTO Required |
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Pneumatic stored energy |
≤2" nominal pipe and ≤150 psig;
OR ≤4" nominal pipe and ≤40 psig;
OR ≤6" nominal pipe and ≤15 psig |
Any pipe size and >150 psig; OR >2" nominal pipe and >40 psig; OR >4" nominal pipe and >15 psig; OR >6" nominal pipe and any pressure |
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Hydraulic stored energy |
≤150 psig; OR Any fluid with flash point >200°F; OR Toxic, highly toxic,
corrosive, unstable reactive, flammable, oxidizing, or pyrophoric fluid (NFPA
55, Para. 6.12.2.2) |
>150 psig; OR Any fluid with flash point ≤200°F |
5.0
Performing ZVV
and ZEV
with Contractors
5.1 It is preferable, whenever feasible, that the construction and service contractors and subcontractors perform their own independent ZEV or ZVV along with the Jefferson Lab qualified worker. At a minimum, the contractor must witness the Jefferson Lab’s qualified worker perform the ZEV or ZVV. For electrically energized equipment, a Jefferson Lab Qualified Electrical Worker (QEW) must perform the ZVV. The rules for contractors are as follows:
5.1.1 If the contractors
are not performing electrical work, they do not need NFPA 70E (2015 Edition) or QEW training and cannot perform ZVV but
must witness the Jefferson Lab QEW perform it.
5.1.2 If the contractors
are QEWs and completed NFPA 70E (2015 Edition) training, they may perform ZVV at their discretion. At least one
contractor representative must either witness the ZVV performed by the Jefferson
Lab QEW or perform their own as confirmation. If representatives perform the
ZVV, they must be a QEW and qualified to perform this task.
5.1.3 If a ZVV cannot be
performed with a VVU, planning and documentation should include the means of
verifying that electrical energy is not present.
6.0
Revision Summary
TPOC change - 01/28/2023 per CBailey (Industrial Safety Program Lead) change TPOC from TFitzgerald to PStanley; ES&H
Manual Editor fixed format only; no content review at this time
Revision
1.1- 02/16/22 Updated training requirements as per CATS#STR-2019-14-01-02. Updated TR requirements as per CATS# INSP-2018-002-01-02.
Minor edits only no approval needed.
Revision
1.0- 01/13/21 New Appendix. Approved by Director and ES&H Director.
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ISSUING
AUTHORITY |
TECHNICAL
POINT-OF-CONTACT |
APPROVAL
DATE |
REVIEW DATE |
REVIEW CYCLE |
rev |
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ES&H Division |
01.13.2021 |
01.28.2023 |
3 years |
1.1 |
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