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#1 Posted : 07 November 2006 08:48:00(UTC)
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Posted By Carrell
I was wondering if someone could help me out with an LEV query I have (or someone who has a copy of HSG54).

Does HSG54 expand upon the transport velocities as laid down in HSG37 to give extra minimum velocities for contaminants?

I have a report here for paint plant assessment which quotes 6m/s for vapours:
a) am not sure if paint mists are vapours or something else?
b) can find no reference to 6m/s in my HSG37.

(Previous companies have always tested to 15m/s for light dusts which I was also never really sure about).

I just want to have some idea of what I'm talking about before I raise my concerns.
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#2 Posted : 07 November 2006 09:20:00(UTC)
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Posted By Paul Leadbetter
HSG54 does not specify any transport velocities; the only HSE figures are in HSG37, I think.
The ACGIH manual recommends 5 - 10 m/s for vapours, 10 - 13 for fumes and 12 - 15 for very fine light dust.

Paul
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#3 Posted : 07 November 2006 10:56:00(UTC)
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Posted By Tony Brunskill
Paint mists are paint mists, paint vapours are paint vapours. Quite often the transport velocity for one will contain the other.
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#4 Posted : 07 November 2006 14:53:00(UTC)
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Posted By Richie
Carrell,

I had to go back to my training notes for this one (Post-graduate Diploma).

Common minimum transport velocities:

Fumes: 7-10 M/second.
Very Fine Light Dusts: 10-25 M/second.
Dry Dusts and Powders: 12.5-18 M/second.
Average Industrial Dust: 18-20 M/second.
Heavy Dusts: 20-23 M/second.
Heavy or Moist Dusts: 23-30 M/second.

I am pretty sure these hail from the states, (ACGIH) however no reference is made.

Hope this helps.

Richie
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#5 Posted : 07 November 2006 15:05:00(UTC)
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Posted By Carrell
Thank you very much all, it has become somewhat clearer now.

I have also spoken with the guy who did the tests and drew up the report; he referenced ACGIH also. He explained why he was classing the contaminant as vapour and why he deemed the systems to be "satisfactory", etc. I am quite happy with his response to my concerns (let's hope the HSE see it the same way!).

Cheers,

Carr
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