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Posted By GavinR
Hi.
Currently reviewing our dusts/powders at site with regard to DSEAR risk assessments and having a bit of bother identifying what dusts are potentially hazardous. We have a number of metal dusts used in metal blasting (aluminium, steel shot etc) and other processes that i need to get confirmed. I'm arranging to get these powders/dusts tested at specialist lab but in the interests of costs and my own knowledge i do not wish to arrange for certain dusts/powders to be tested if this is not necessary. Anyone be able to advise on what are the common types of metal dusts that would pose a hazard or is it purely a matter of me needing to get them all tested to confirm.
Cheers for your help!
Gav
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Posted By paulw71
Hi Gavin
Can your suppliers not provide this information.
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Posted By Adam Worth
From past experience - tho I may be correct here - you can look at first principles.
1) If it's thermodynamically favorable for oxidisation to occur then the dust has the potential to partake in an explosive reaction.
2) If the dust presents as a fine powder an explosive reaction may be mechanically favourably. Large particle size may not.
Combining the above two may give you an idea of what you need to further screen?
Hope that helps - tho my chemistry is a bit on the rusty side (Excuse the oxidisation pun).
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Posted By Adam Worth
"tho I may be correct here"
Sorry that sounds arrogant :) That should read corrected..
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Posted By Fred Pratley
As I recall, Magnesium (particularly casting), Titanium and possibly Vanadium? are ones to watch for.
However, I would talk with your supplier of blasting kit as they will probably know.
regards
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Posted By Flic Most metals oxidise readily. A good place to start with this question might be HSG103, 'Safe handling of combustible dusts; precautions against explosion'. Dusts are categorised as to the rapidity with which the pressure rises when they are set alight. This documents gives you an insight into how this is done, what it means, and how to design for safety. The following document contains a huge amount of data that has been measured: Combustion and explosion characteristics of dusts (BIA-Report 13/97) http://www.dguv.de/bgia/...rep02/biar1397/index.jspEnjoy! Flic
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Posted By Phil Grace
Gavin,
Aluminium powder is explosive....! Very much so....
Phil
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Posted By steve grimes
but Al granules arent
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Posted By GavinR
Hi Guys,
Thanks for all your responses and good advice. I have contacted a testing lab and they are advising on the testing so hopefully will get a definite decision after reviewing our msds's and the processes they are used in.
Cheers for the help,, much appreciated.
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Posted By jom
Gavin.
Do you have materials that no other industry has ever used or produced?
Why the leaning towards testing? Why not go to the books?
Weren't you able to find out that aluminium dust is explosive?
Sawdust is explosive. Sugar dust is explosive. It might be good policy to assume all dusts are explosive.
John.
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Posted By Yossarian
Jom has a point.
Do check existing research, it may save you a few £ grand.
A previous company in which I worked blended cement & sand (pretty inert) with a super sticky polymer powder (explosive).
In the end we went with the testing because we needed to know if our unique combination of materials was explosive.
Turned out they weren't as the polymers were sufficiently suppressed by the inert dusts, but the peace of mind given was invaluable.
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Posted By steve grimes
Duh, like the guy has said thanks, i would suggest the thread is closed ?????
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