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>Posted on 4 Sep 1996 at 11:34:18 by Alan D. Secor

>I'm in the process of
>completing a 1 atm submarine that I purchased partially finished.  The closed
>system in this case is rigid so the volume stays the same.  Now, as I
>metabolize O2, will the pressure decrease, such that I can use a simple demand
>type regulator to inject O2 along with a scrubber to remove CO2, and maintain
>a constant internal pressure of 14.7 psi?  TIA (again).


To a first approximation:

ppH2O is fixed (100% humidity at the temperature in question).
ppN2 is about fixed (N2 will come out of solution if ppN2
in the breathing loop drops below some 10 psi or so).
O2 is metabolized - the pressure drops.
CO2 is produced - the pressure increases.

With a good scrubber then the pressure would drop at
a rate a tad slower than what you'd anticipate from
your O2 consumption alone.

A 14.7 psi constant pressure O2 valve would work.

Regards,
John

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