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Posted By Martin Taylor
Can anybody help me put forward a case for safe handling of Isocyanate IBCs.
We are about to implemet a process using MDI isocyante material supplied in IBCs with 3 -4 IBCs to be stored on the shop floor.
I have requested that the store area and pump areas be enclosed in a partitioned room complete with extraction so that in the event of a spillage all materials will be contained and spillage control can be handled without concern of exposing adjacent operators.
I am being told that this is not necessary as the area will be bunded (will this contain vapours - I don't think so?) and that other sites do not contain in this way.
Are any of you running similar processes? If so how do you manage storage and protection of others from spillages
looking forwards to hearing your opinions
thanks
Martin
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Posted By shaun allport
Martin,
assuming you have got your PPC Permit for amounts stored parts A&B, i suggest you go to the Defra website and print off Process Guidance Note 6/29 (04) this will help your cause (storage) no end!!
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Posted By Mark Eden
Worth looking on the HSE site under occupational Astma and the various publications they produce that mention isocyanates.
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Posted By Martin Taylor
thanks Mark - had already searched HSE and couldn't find material specific enough - does anybody else have HSE documents covering IBC storage of isocyanate?
ta
Martin
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Posted By Paul Leadbetter
Martin
MDI boils at over 300º and its vapour pressure at room temp. is negligible. The boiling point will be even higher if the isocyanate is prepolymerised. I can't find a figure for the vapour pressure at room temp so can't calculate the equivalent concentration but perhaps the manufacturer of your material can help you out.
Paul
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Posted By Kate Graham
Most of my data sheets for various grades of MDI say the vapour pressure is negligible / very low / not applicable, one says less than 0.0001 (but doesn't give any units for this value), another couple say 0.0004 mm Hg and another one (from the same supplier) claims 0.000004 mm Hg (misprint surely?)
Although the vapour pressur is low, wouldn't inhaled droplets be a problem in the event of a spill?
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Posted By Mark Willis The volatiles are very low for this material as already stated by the other respondants. You also need to look at the defra site for PG6/29(04), PPG21 and PPG26 - for the legislation and various guidance notes. Perhaps the next step will be to look at the isocyanate producers (and users) association site at www.isopa.org the information is invaluable.
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