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To: heyydude@pi*.co* (Mr. Dude)
From: seasport_scuba@su*.ne* (Bill Brooks)
Subject: Re: CO2 scrubber
Cc: techdiver@terra.net
Date: Sat, 2 Nov 1996 12:56:22 -0800

>It is both temperature and depth related, according to the Navy.  While I
>can understand temperature, depth is still a mystery to me because of my
>knowledge of how the human body works.  CO2 is a direct by-product of
>metabolism.  You make more, the harder you work.  That's why breathing
>rates increase with activity.
>
> But what I DON'T understand is why depth would be a limiting factor on
>scrubber life. 

Hi Kevin

From my reading of the USN recommendations for breathers their is a
reduction in scrubber duration with depth only in cold water.  This to me
implies that the problem has to due with temperature loss in the scrubber
bed due to the increased mass of cold gas flowing through the scrubber bed
at great depth.

It is not due to any increased CO2 production or a reduction of CO2
absorbtion with pressure but rather due to the loss in bed temp.


Bill Brooks

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