Rebreather World - View Single Post - What is the amount of inert gas removed during offgassing

jaap · 28th January 2008, 00:27

Quote: (Originally Posted by ianfirmin)

Does anyone out there have any numbers on the amount of inert gas removed from a body during decompression? If this was (has been?) measured it may give an indication of the accuracy of the compartment model.

Lets say a body (human, goat whatever) was (in the terms of the decompression model) taken from one saturation state to another and the amount of inert gas exhaled was measured then....if you could estimate the ratio of body mass in various tissue compartments and the amount of gas expected to be excreted you may be able to validate the model.

I'm also interested if the amount of inert gas expired would significantly effect the existing fractions of gas in the loop.

Any info on this??

Kind regards
Ian

If you want to dig into it, do some searches on Rubicon, Rubicon Research Repository: Home

Then you will find many related things, such as this report:

http://archive.rubicon-foundation.or.../ADA277395.pdf

If a very simple and rough estimate is of any help one can approximate that a normal adult at the surface holds about 1 litre of dissolved nitrogen (can dig out a reference later). For saturation air diving it seems that Henrys law is fairly valid. This gives that a returning saturated air diver will need to eliminate something like one litre per atm of diving depth in order to eliminate all excess nitrogen. Of course this reasoning is way oversimplified.

28th January 2008, 00:27	#5 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 451	Re: What is the amount of inert gas removed during offgassing Quote: (Originally Posted by ianfirmin) Does anyone out there have any numbers on the amount of inert gas removed from a body during decompression? If this was (has been?) measured it may give an indication of the accuracy of the compartment model. Lets say a body (human, goat whatever) was (in the terms of the decompression model) taken from one saturation state to another and the amount of inert gas exhaled was measured then....if you could estimate the ratio of body mass in various tissue compartments and the amount of gas expected to be excreted you may be able to validate the model. I'm also interested if the amount of inert gas expired would significantly effect the existing fractions of gas in the loop. Any info on this?? Kind regards Ian If you want to dig into it, do some searches on Rubicon, Rubicon Research Repository: Home Then you will find many related things, such as this report: http://archive.rubicon-foundation.or.../ADA277395.pdf If a very simple and rough estimate is of any help one can approximate that a normal adult at the surface holds about 1 litre of dissolved nitrogen (can dig out a reference later). For saturation air diving it seems that Henrys law is fairly valid. This gives that a returning saturated air diver will need to eliminate something like one litre per atm of diving depth in order to eliminate all excess nitrogen. Of course this reasoning is way oversimplified. __________________ My initials: JAAP
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