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Posted By Kevin Mclaughlan
Having recently installed an LEV sytsem in our new woodworking shop,i am struggling to find a company that hires out a particle monitor which i require to ensure the LEVs effectiveness.
If anyone can point me in the right direction or if need be to purchase a monitor it would be appreciated.
Also does anyone have information on the WEL for wood dust?
I am in the Edinburgh area if that helps any.
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Posted By Ron Hunter Not a huge help I know, but if you're stuck you could make enquiries thru' the British Woodworking Federation - usually there's someone helpful on the end of their 'phone. See http://www.bwf.org.uk/
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Posted By RP
WEL for wood duct are available from HSE website, do a search for wood dust.
A dust lamp is the most common means of checking for wood dust in the atmoshere, and the cheapest. This will show any 'leaks' in the system or ineffective capture.
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Posted By Allan Rhodes
Wood dust is a general term covering a wide variety
of airborne dusts. I don't know if you are talking
about hardwood or softwood. However,the WEL for both
is 5mg m3. Both woods are sensitisers but hardwood
dust is carcinogenic. The HSE is currently reviewing
the limits for these.
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Posted By Jim Walker
Kevin,
Disclaimer: I'm no expert just what I've picked up via my hobby.
I have several books that list the more hazardous woods
Hardwoods are worse than softwoods - be careful applying this as Balsa, for example, is actually a hard wood.
Real bad uns are ebony and some native Aussies.
I picked up a nasty skin rash from laburnum.
EH40 has a guidance section on wood dusts.
Regarding LEV (I do have a bit of expertise here) the stuff needs checking by competent person (usually the LEV manufacturer) Not sure if the 14 month rule applies (it certainly doesn't for metal dusts).
A daily check would be an index finger over an adjacent horizontal surface
For metal dusts I used (when involved with this) to do a weekly aeronometer check of workface velicity
Most likely problem you will encounter is filter blockages - assume LEV is fitted with before & after pressure guagues
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Posted By Paul Leadbetter Kevin If you just want a qualitative check on LEV effectiveness then, as said above, a dust lamp is very good. Check out the HSE method MDHS82 at: http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs82.pdf. Purpose-made dust lamps can be quite expensive but I have used a 1 million candlepower lamp from Homebase (cost less than £20) to some effect. Paul
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Posted By Stuart McPhaden
Have emailed details
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Posted By John Mackessack
Hi Kevin,
I have used a Casella microdust meter quite extensively and this has been very useful. I know that they rent these out too.
However, beware, these machines are usually calibrated against Arizon Road Dust or similar and are not relevant to the WEL if used in isolation. To really check against the WEL, you really need to perform studies using the recognised methods for determining hazardous substances (MDHS).
Also, an earlier posting correctly states that the WEL is under review. It is likely to be reduced. 5mgm-3 is considered as being pretty high. In Germany for example the WEL is 2mgm-3 (by their methods).
Hope this helps
John
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Posted By Andy Young Probably the cheapest place to rent one is HSS. The comment regarding calibration with different dusts is a very valid point. You can run a MDHS14 sample in tandem with the Microdust to obtain a 'calibration factor' for the dust you're measuring. http://www.hss.com/g/49770/Dust_Monitor.html
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Posted By Kevin Mclaughlan
Thanks to all of you who have responded to my questions which have helped greatly.
Just as the dust has settled its time for the weekend.
Enjoy
Kevin
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