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Posted By Karen Todd
Hello all,
Working on a COSHH assessment for the above. Trying to decide on the constituent components of the dust produced. So far have got iron, zinc and the bits of the grinding wheel as it breaks down, but not sure about iron oxide and zinc oxide.
Realise iron oxide and zinc oxide would be produced if the galvanised steel was being welded or flame cut, but not sure about dry grinding. Thought that the temperature at the grinding wheel/steel interface could get quite high and small amounts of iron oxide and zinc oxide could potentially be produced.
Anyone advise?
Karen
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Rank: Guest
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Posted By Ron Hunter
Suggest you don't get too hung up on the constituents. If you are dressing welds, then constituent is mainly from welding rod, and zinc will already probably have been lost during welding/weld prep.
I would use parallels from EH40, e.g. Ferrous Foundry particulate, respirable dust 4mg/m3, inhalable 10mg/m3 (almost 'universal' figures for a lot of dusts) Look at process in context of housekeeping, hygiene practices and LEV and if necessary get someone in to measure dust levels (personal monitoring)
By the way -big difference between dressing/grinding and 'buffing' which is more of a polishing process.
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