1. IOES Guidance Document
One-Plus practices
Red Tag placement
Tie-wrap management
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9/12/12

2. One-Plus Guidance Definition from IOES:
One-Plus is the method, practice, or design used to physically prevent inadvertent operation of an isolating device. "One plus" means that two separate, unrelated actions must occur to defeat the isolating device. The "One" refers to the isolating device itself and the "Plus" refers to the steps taken to prevent inadvertent operation of the isolating device.
Isolation when One-plus is required:
Master Red Tag System
Individual Red Tag System
Energy Control Operating Procedure (ECOP); including exclusive control
How One-Plus is achieved:
Manufacture’s design
Additional safeguard
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3. One-Plus Guidance Roles that apply One-plus:
Facility Representative (Master Red Tag System, Individual Red Tag System)
Authorized Procedure User (ECOP)
Roles that verify One-plus is effective:
Job Representative (Master Red Tag System, Individual Red Tag System)
Worker (Individual Red Tag System)
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4. One-Plus Guidance Why one-plus is critical:
The primary means of isolation is the use of a tag-out system. WE must protect people from the unexpected release of hazardous energy.
Things are going to occur that are unexpected and unplanned.
To prevent inadvertent operation of an isolation device.
We can not engineer the human factor out of our plants. A dropped tool, an inattentive worker are going to happen.
One-plus must be effective. It is a layer of protection. Even manufacture’s designs can wear, slip or fail.
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5. Manual Valve Evaluation
Confirm the valve
is in the
desired position?
Does
the valve have
a straight handle ?
Secure the valve by:
- Removing the handle, or
- Securing the handle (cable tie, rope,
chain etc), or
- Covering the valve handle
If these are not feasible, find another
way of ensuring the valve cannot be
inadvertently operated.
Start
Yes No
Do you
need to use excessive forcea
or tools to operate
it?
Yes
“One Plus is inherent
in the design or design
& location of the valve. No
Is it located
where it would be nearly
impossible for someone
to access itb? No
Yes
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6. Foot notes for Manual Valve Flowchart (previous slide)
aExcessive force is generally defined as having to use two hands and to pull with maximum effort on the valve handle in order to get it to move. In this situation it should be virtually impossible for the valve handle to be inadvertently operated due to the difficulty in getting the valve handle to move. bThe valve is in a location where it is not accessible by ordinary means. For example the valve is in a pipe rack and in order to access it a JLG or scissor lift is needed. In addition, there must not be any work in the vicinity of the isolating valve. If the Facility Representative is using a ladder, they must assure that the ladder can not reposition the valve.
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7. The following slides show acceptable and unacceptable methods to achieve one-plus, attach red tags, and manage tie-wraps.
2/16/07
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8. Switchgear A good example of One- Plus. The One- Plus is the lock
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9. Switchgear A good example of One-Plus.
The One-Plus is the nylon cable tie thru the hole
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10. Round Handle Valve
A good example of One Plus. The One Plus is the nylon cable tie which is restricting movement of the valve handle.
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11. Round Handle Valve
A good example of One-Plus. The One-Plus is the nylon cable tie which is restricting movement of the valve handle.
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12. Round Handle Valves
A good example of One-Plus. The One-Plus are the plastic covers, sometimes referred to as “clam shells” or “doughnuts”.
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13. Round Handle Valves
Another good example of One Plus showing 4 covers and 4 Red Tags on 4 different valves.
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14. Straight Handle Valve
This may be a poor method to attach the red tag. Can the red tag slide off?
Car seal is preventing
movement of the valve handle
A good example of One-Plus. The One-Plus is the metal car seal.
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15. Straight Handle Valve
A good example of One Plus. The picture is showing a close up view of the metal car seal securing the valve handle.
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16. Straight Handle Valve
The valve handle is secured into position by the nylon cable tie. It is hard to determine if this prevents the handle form rotating.
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17. Large Gate Valve
A good example of One-Plus that is inherent to the design. This valve is very difficult to operate. This valve cannot be operated unless someone uses a valve wrench, two hands and a step ladder.
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18. Valve is difficult to access
This example of One-Plus is achieved 2 ways - large multi-turn valve (inherent to the design) and remote location. This valve is located more than 20’ up in the air making it very difficult to access and there will be no work done in the vicinity of the valve.
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19. Valve is difficult to access
Missing red tag - The Red Tag must be hung even when the isolation device is difficult to access.
Good example of One-Plus. This valve is located more than 20’ up in the air making it very difficult to access and there will be no work done in the vicinity of the valve.
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20. Chain Operated Valve A good example of One-Plus.
The two chains are locked together.
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21. One Plus by Design
Bolt is securing
the valve into
position
A good example of One-Plus by design. The valve is secured into position by the nut and bolt.
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22. One-plus by Design - Round Handle Valve
A good example of One-Plus designed into the valve. In order to operate the valve, the metal plate must be disengaged from the metal tab.
metal tab fits in slot – make sure tab and slot are not worn
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23. One-plus by Design
Two more examples of one-plus provided by the manufacturer
Tab on handle must be slid upwards prior to turning
Handle must be squeezed prior to turning
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24. Valve Handle Removed
A good example of One-Plus. The valve handle has been removed and secured to the valve (so it isn’t lost).
Note: some valves may leak thru the stem when the handle is removed. The Fac Rep must understand the equipment.
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25. Proper one-plus (valve handle removed)
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26. Valve Handle Removed
A good example of One-Plus. The valve handle has been removed.
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27. Good example of One-Plus: Two Cable Ties used to loop through and one-plus
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28. Although the cable tie was not long enough, the Facility Rep found a way to properly one-plus this valve without removing the handle
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29. Poor Example of One Plus
Nut is not
secured to the bolt
A Poor example of One-Plus. This is a poor example because the nut is not secured onto the bolt and could easily fall off.
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30. Several examples of cable tie only attached to valve handle (no one-plus)
Missing Tag?
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31. Missing Red Tag? In a RCI, PSM inspection, or job walk, this could be confusion. Keep your house clean, remove all cable ties!
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32. Poor Example of One-Plus
A Poor example of One-Plus.
There is no One-Plus.
The handle has not been removed or secured. This handle could easily be kicked, bumped especially since its at ground level.
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33. Poor Practice A Poor practice.
When removing the Red Tags, the cable ties were left in place. The cable ties should be removed and discarded after each use.
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34. Poor Practices
Poor practice. Do NOT do this. The cable tie is not protecting the switch from inadvertent operation. Switches are not isolation devices. Hopefully in these examples, the switchgear is isolated and tagged out.
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35. Wrong Tool for the Job! Do NOT use a knife to cut the cable tie.
This is the wrong tool for the job.
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36. Proper Cable Tie Cutting Technique
A good example of proper tool use for cutting the cable tie.
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37. Red Tag used on an air mover. This is an incorrect use of the Red Tag
Red Tag used on an air mover. This is an incorrect use of the Red Tag. Red Tags are used to isolate energy, not keep equipment in place.
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38. Poor Example of Tag Attachment
Is a Red tag missing?
A Poor practice.
The Red Tag MUST be securely attached to the isolating device. In this example, the tag could easily be removed or blown off by wind.
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39. Summary
All isolation devices are required to be protected from inadvertent operation (one-plus). One-plus is a layer of protection.
There are many ways to achieve one-plus, either thru the manufacture’s design or something that the Facility Representative or Authorized Procedure User does.
Sometimes one-plus is going to protect many people (Master Red Tag System, Individual Red Tag System) and sometimes it is protecting a single worker from themselves (exclusive control).
How do you know if one-plus is effective?
What happens if a scaffold board strikes a valve handle, a slip blind or other isolation device? Would it turn, fall or change position enough to release hazardous energy?
Conduct physical tests to assure effectiveness.
2/16/07
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