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Posted By dave burrage
We need to prepare the surface of a number of components for re-coating. This preparation will include completely removing the remaining 'old' coating on the component. The waste from the blasting process will be collected through extraction systems for disoposal. We are intending to carry out a COSHH assessment on the residual 'dust' prior to making a decision on how/who/where etc this will be disposed of and i am of the opinion that the assessment must take into account not only the blasting grit itself but also any other material likely to be contained in the residue, i.e. substances contained in the old coating. Has anybody had any experience of this?
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Posted By Frank Hallett
Dave, your initial intent is the right way to go.
I've done a similar job for a previous client but have to say that the current tranche of Waste legislation has changed the focus with regard to disposal.
Feel able to contact me directly if you wish.
Frank Hallett
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Posted By Smurfer
yeh, get samples analysed (particularly for metals such as lead, cadmium, etc.) before disposal. Been involved in similar work with lead-paint being blasted and found significant levels in the waste dust.
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Posted By Smurfer
Oh, and if there are any nasties in the paint/grit then you need to get some air quality sampling done to determine the correct ppe/controls for operatives. You may find even if there are no nasties that operatives exposure to the dust when cleaning up exceeds the 4/10mg/m3 respirable/inhalable 'nuisance' dust limits anyway. So it may be best to get some monitoring done anyway.
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Posted By John Murgatroyd
My company obtained, at great expense, the services of a waste disposal company to see whether or not the residue from a paint shop (dust, cans and drums) needed to be disposed of in any special way. The answer was no. So it gets dumped in the ordinary rubbish.
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Posted By allan wood
If there is lead in the existing coatings or residue you may well have to consider health surveiillance (lead medicals etc).
Even though shot blasting helmets provide breathable air to the operative the level of respirable dust inside the helmet can often get quite high.
As an ex-shot blaster/painter, as a belt and braces approach i used to wear a suitable dust mask whilst undertaking the blasting operations.
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Posted By dave burrage
Thanks for all the comments. Initial analysis shows there are traces in the microgram per gram range of nickel, chrome and of course aluminium. Translating this into mg/m3 for airborne concentrations if the dust is released during disposal is proving tricky. Any ideas anybody?
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Posted By Smurfer
Assume that you can maintain total inhalable dust at or below 10mg/m3 since this is the coshh 'limit' for non-toxic dusts and you'd have to keep to this whatever. Then apply whatever percentage of chrome/nickel etc you've got (from the ug/g) to this 10mg/m3. This'll tell you what the likely mg/m3 level would be for those metals if you have a total dust conc at 10mg/m3.
EG if 10% of your dust is nickel, then applying the above will give ou a 1mg/m3 nickel concentration in air.
Before anyone shoots me down, this is what I would term a 'back-of-fag-packet' approach!
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