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Posted By Carl
We undertake rail tunnel surveys as sub-contractors that involve working from MEWP’s (cherry pickers) supplied by Network Rails principal contractors.
The problem is this:
Ventilation varies in tunnels and is reliant on ventilation shafts and natural draught on the night of the line possession. We are experiencing a build up of diesel fumes in the crown of the tunnel after a few hours work that causes short term exposure symptoms i.e. irritation of the eyes and respiratory tract.
I am looking for practical solutions to control emissions and reduce exposure that can be suggested to the principal contractor rather than having to rely on respiratory protective equipment.
All suggestions greatly appreciated,
Carl
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Posted By The toecap
Sounds a bit like a confined space problem
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Posted By Berg
Can the exhaust fume be pumped directly into LEV and directed out of the tunnel or to vents?
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Posted By Bob Shillabeer
Firstly where does the exhust fumes come from? Are there any locomotives operating in the tunnel? What does the method statement say about diesel fumes? Are the cherry pickers self propelled? Etc. There are quite a lot of questions that should have been asked by the preparer of the method statement.
I suggest you look at the MS and see if diesel fumes have been identified, if not challenge the adequacy of the method statement.
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Posted By Martyn Hendrie
You could induce air movement by installing large (1m diameter)fans at the end of the tunnel to push the fumes through.
These could be located in the safety zone at the side of the track and ducted to the entrance, minimising the amount of equipment to be shifted at the end of a possession.
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Posted By Carl
Martyn
The use of fans is interesting, is this a recognised and commonly used method? If so would it not introduce large quantiies of cold air, particularly at this time of year.
Bob
No loco's present - T3 possesion. Cherry pickers are self-propelled and will be very mobile during the shift
Has anyone any experience of using filters directly to the exhaust of machinery (MEWP's)
Carl
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Posted By Carl
Alan
I have seen this document and while it is very useful I am hoping for specific tried and tested solutions if possible.
We have undertaken surveys of this kind in smaller length tunnels (up to 600 metres) and did not perceive a problem. The tunnel we are presently surveying is over a mile long and there is a definite build up of fumes throughout the shift.
Carl
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Posted By Chris Pope
Factair tel 01473 74600
factair.co.uk
are specialist in temporary tunnel ventilation
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Posted By Simon Birks
Hi, If you would like a confined space point of view with RA's, Safe System, ventilation and Breathing apparatus issues please contact me.
Gus
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