[PSUBS-MAILIST] life support test

[Cliff Redus via Personal_Submersibles]

See

*DESIGN GUIDELINES *FOR

CARBON DIOXIDE SCRUBBERS

I

MAY *1983*

REVISED *JULY 1985*

Prepared by
M. L. NUCKOLS, A. PURER, G. A. DEASON

for the philological affects of high CO2 level but if you abort the test if
you ever exceed 5000 ppm, you should be safe.  In addition to the CO2
issues, you should also familrrize yourself with both *Hypoxia* which
describes levels lower than Normoxia, or percentages lower than 21% and
*hyperoxic* breathing gas when levels rise above 22% of oxygen. Hypoxia
would come from running out of makeup O2 or leaving the O2 supply valve
closed by accident and hyperoic state would most likely be caused by a high
pressure leak of O2 into the cabin caused by a loose fitting.  I would
recommend you abort the test if O2 concentration falls outside the
acceptable range as defined by ABS.

When you go back and analyze the test, it is helpful to have data logged
cabin atmosphere parameters including, CO2 and O2 concentrations, cabin
pressure and temperature and relative humidity.

Cliff

On Sat, Mar 17, 2018 at 5:37 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi All,
>               Thinking about testing my life support.  Will obviously have
> some people outside the sub watching me, and talking via radio.  But I was
> wondering if there would be a point at which I should abort the test when
> the CO2  gets to a certain point .   If it levels off and stays at a
> constant but is some what elevated would it be ok to monitor that situation
> ?   Like say it levels off at 2000 ppm and assuming my oxygen is at a
> constant 20.8 %    ?
>
> Brian
>
>
>
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>
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