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VOC concentration and LEL problem

VOC concentration and LEL problem

VOC concentration and LEL problem

Hello everybody,

I have following problem:
I have a combustion chamber for 6000m3/h of gas with concentration 10g VOC/m3. Question is, what amount of gas with VOC concentration 36g VOC/m3 (96% LEL) I can let flow to combustion chamber?

My opinion is, that I can make a mixture:
4400m3/h of fresh air and 1600 m3/h of gas (90%LEL).

But somebody told me that I can have only 800 m3/h of gas (90%LEL).

So, I would like to know who has true?
Thak you very much...    

RE: VOC concentration and LEL problem

Looks like no one wants to take a crack at this one.  Seems to me that you are lacking some crucial information.  How can both 1600 m3/h and 800 m3/h of the same gas get you 90% LEL?  You don't say what gas this is.  LEL is a property of the gas, rather than being an equal value for all gases.  It's also necessary to know you have sufficient oxygen, or there is no LEL.  SO, provide more information, and maybe I or someone else can help.

RE: VOC concentration and LEL problem

nice post...


RE: VOC concentration and LEL problem

I agree with cheute79, but additionally, I would be somewhat concerned about working that close to the LEL in any case.  Murphy lives and a slight miscalculation could end with an expensive legal case.   

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