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Posted By Adam Worth
Hi all
Looking for some guidance and opinion on where to look for good practical information on the above, and what other people do.
Specifically -
Lock out boards VS individual locks for mechanics. - Apparently the HSE don't like the use of boards? - Ideas on key control during shift handover - lost key procedure etc.
Also testing for dead - regs imply this should be done by an electrician - how is this best done in workable way?
My experience of this is limited to COMAH and chemical, advice much appreciated on how to apply to machinery maintenace work.
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Posted By Tom Doyle
Hello Adam,
This is only a suggestion. If you are looking for guidance there is a document that might help. I know the Canadian standards are not referenced in the UK regs but here goes.
There is a Canadian standard in which I think you could find some excellent guidance.
CSA Z460 Control of hazardous energy — Lockout and other methods.
The electronic copy sells for $95 CAD (about 54GBP). It was money well spent for me.
Send a quick e-mail if you are interested and I will send you a link off-line.
Cheers
Tom Doyle
Industrial Safety Integration
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Posted By Peter How
Adam
If you google "electrical isolation procedures locks" you will get a wealth of stuff to buy. However you want some practical guidance. There a 3 types of isolation. 1- Motive power, you don't want it to run for production purposes. 2- motive power, a mechanic wants to work on mechanical equipment driven by electric motor. 3- Electrical -an electriciam want to work on a motor (touching electrical copper wires).
They all involve locking off the Starter of the motor.
The procedure is the same. Identify the running machine and its starter or isolator (read the labels - if there is one). Turn off the isolator, apply a hasp, apply a lock, issued to the person doing the work. Try to re-start the machine - it should not, but this is where you discover wrong labelling, wrong cover on starter, faulty starter, if it does start!
Once the isolation is proven then start work. The mechanic must keep the key on them. Each person working should apply their own lock so as they finish at different times they can remove their own locks. When all removed, you can restart equipment. Electricians are different. Here they must additionally check that the copper conductors are dead by using a voltage tester. [test the tester before and after use].
Process machinery may require isolation of valves and pipelines. Don't forget stored energy in terms of pressure or potential energy.
I recommend a board of locks which are signed out in a log book to the worker. The key to the lock must be kept by the worker to prevent any inadvertant de-isolation.Signed back when returned and deisolated.
clearly there need to be special procedures for lost keys, jobs lasting several days, many fitters on one item of equipment. PS only one key per lock, no duplicates.
regards Peter
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Posted By Warren Fothergill
Peter is correct, that is one methodology. What does your SSOW say? Do you have one, perhaps you should look at isolating both upstream and downstream? Is a permit to work considered as part of the SSOW.
The process of lock-out is to ensure the person completing the works is safe and free from risk, so you can issue him the lock, as long as he/she knows what they are to lock of and it is identified accordingly. Schematic drawings are good for this.
Is this part of a wider issue?
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Posted By Adam Worth
Thanks for replies so far all very useful!!
@Peter - That's what I was after and where I was confused. Thanks very much for that post!
Is there a source for the 3 stages of isolation that I can reference?
@Warren - it's always part of a wider issue, if only life was simple :)
Machines all have clear isolation points, that part is fine, my concern is with fault of built in isolator, what counts as testing for dead, and practical control of keys and locks. - Currently upgrading SSoW.
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Posted By Peter How
Adam #2
Shift c/o: In this sort of case really need a Permit To Work, so return the keys with the PTW at end of shift and then reissue the keys with the endorsed PTW for next shift. Use a job key box if there are large nos of people or isolations, with one key on the box protecting all the individual isolations with lead hand 'owning' the safety lock key.
Lost keys are dealt with under your Incident reportinng procedure. Lock then cropped (cut off) by permission of a manager signing on the incident form.
regards Peter
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Posted By Gus Adam HSE enforcement initiative and questionnaire on machinery isolation's can be found at: http://www.hse.gov.uk/fo...sectors/manuf/030801.htm - give you a good idea of where they are coming from The advantage of lock and tag boards is the fact that you can immediately see which locks are in use -if security of keys is a problem this can be overcome with a key press, and you need a system for shift handover / 'lost' keys and any system needs enforcement Tom is right about the Canadian standards though you may not to actually buy them as there is wealth of good free advice on lock and tag especially from north America where its pushed much harder In UK the simplest step by step i could find was at - www.hseni.gov.uk/lock_out_procedures.pdf Comprehensive guide at:Worksafe BC including a very good video ( you just have to watch reference to Canadian regs) http://www.worksafebc.co...c/electrical/default.asphttp://www2.worksafebc.c...ideos.asp?ReportID=34546Last time I dealt with this we were looking at surveying each machine to identify the isolation's required( all types of energy) then creating a SSW / checklist for each machine with annotated photo based on this, which we were going to post on the machine Hope this helps
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Posted By Peter How
Adam
I'm afraid its out of my head, developed during training on my new PTW system. I realised people were confused as to why they were isolating a motor. So I defined motor isolation and seperated isolation of motive power from touching motor electrical terminals. Once people understood "why" they were isolating a motor it all became much easier.
We have since developed a set of guidelines for effective isolation of everything.....!
Peter
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