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10mg/m3

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gfsw
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10mg/m3

Post by gfsw »

Hi all,

We have a process which produces a fair amount of dust.
The dust in the atmosphere must not equal / exceed 10mg/m3.

The problem is - what does 10mg/m3 mean - its just numbers to me - can you explain please so I can grasp the meaning and then move forward with risk controls.

cheers
garry
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Re: 10mg/m3

Post by bernicarey »

Well put quite simply, breaking those numbers down...


Take a typical medical 'capsule', that people take orally, one of those might contain between 10-25 mg of a powdered drug.
Example = http://www.cvs.com/webcontent/images/dr ... _11004.JPG" onclick="window.open(this.href);return false;
So one small capsule worth of your dust, in a box that is a 1mtr square cube. .salut
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Re: 10mg/m3

Post by jonsi »

that level is pretty low so the dusts you must be working in are either very fine or are 'nasties'.
This would lead me to think "we should put the dusty process in its own closed off area and have LEV to reduce the dust levels further".

We have an output emission limit on a chimneystack which is 50mg/Nm3.

On a point of interest ...there is a slight difference between Nm3 (Normal cubic metre), Sm3 (standard cubic metre) and m3 (cubic metre) to do with gaseous volume at different temperatures but not enough to get hung up about in general terms, so if you see these variants they still refer (pretty much) to a cubic metre. If you were working out volumes on a fine margin then the differences come into play.
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Re: 10mg/m3

Post by Keith1983 »

Sounds to me like you need to get some samples done. There are numerous ways of doing this and hundreds of companies out there that will do it for you and tell you how much your atmosphere contains. The problem being this is just a snapshot of one particular moment in time. If you can seek some expert advice on the best way to measure your particular contaminant and then take regular samples yourself this will be much more accurate and enable you to react quicker to any issues and also build up a picture of the aspect which influence the levels.
So when the whole world is safe..............what are we going to do then?
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Re: 10mg/m3

Post by gfsw »

I understand - hurray
thanks people.

cheers
garry
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Re: 10mg/m3

Post by Alexis »

Garry, there is this site from the HSE which may help also. http://www.hse.gov.uk/dust/" onclick="window.open(this.href);return false;
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Re: 10mg/m3

Post by Coldrop »

bernicarey wrote:Well put quite simply, breaking those numbers down...


Take a typical medical 'capsule', that people take orally, one of those might contain between 10-25 mg of a powdered drug.
Example = http://www.cvs.com/webcontent/images/dr ... _11004.JPG" onclick="window.open(this.href);return false;
So one small capsule worth of your dust, in a box that is a 1mtr square cube. .salut
Excellent explanation berni .salut
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Re: 10mg/m3

Post by bernicarey »

I should just add to my explanation above, where I have cited the example of a medication capsule, that when one of those is marked as 10mg, that is the 'active ingredient' - not the total amount of powder inside.
So 10mg might only be around 1/4 of a capsule worth of dust, or perhaps even less. .salut
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gfsw
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Re: 10mg/m3

Post by gfsw »

Thanks for the input, I have a meeting this Wed and your contributions will come inot play.
cheers
garry
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Re: 10mg/m3

Post by J_ohny »

Hello,

Please I need advice and I'm not good at maths.

I working at room with ventilation but without air outcome, where is so dusty enviroment.
I did check the HSE website, I need explain if is it meaning same 10mg/m3 after 8hrs as this amount from 0,75x1m2 of the powder after 9hrs?, more at pic.
How I can transfer or calculated on m3? Or can I use this amount for diagnostic that it is not good?
I guess that it is couple grams :lol: :(
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Re: 10mg/m3

Post by Blackstone »

I don't know the calculation but what is the powder?
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Re: 10mg/m3

Post by J_ohny »

Blackstone wrote: Tue Sep 28, 2021 11:50 am I don't know the calculation but what is the powder?
It is mix of "Cekol", gelatine and rarerly we working with a Silica
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