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Workplace Exposure Limits
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Lynnie  
#1 Posted : 12 October 2010 15:29:55(UTC)
Rank: New forum user
Lynnie
Hi All. Could anyone give advice on the calculation method for STEL and LTEL please. I have become a little confused with the process?? Thanks
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Heather Collins  
#2 Posted : 12 October 2010 15:56:00(UTC)
Rank: Super forum user
Heather Collins
I think you need to give us a bit more detail. What exactly are you trying to calculate and where are you stuck?
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Kate  
#3 Posted : 12 October 2010 16:05:48(UTC)
Rank: Super forum user
Kate
If you post an example (with data) of what you are trying to calculate, I am sure someone will be able to help.
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stephendclarke  
#4 Posted : 12 October 2010 19:21:04(UTC)
Rank: Forum user
stephendclarke
Hi, I think you’ll find all the info you need in document EH40 including examples of calculations, its freely available at: http://www.hse.gov.uk/pubns/priced/eh40.pdf To convert from ppm to mg/m3 use the following formula for the workplace exposure limit: WEL mg/m3 = (ppm x substance molecular weight)/24.06 As a rough guide STEL = 3 x LTEL if information on the STEL is not available. Regards Steve
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