[PSUBS-MAILIST] CO2

[Rick Patton via Personal_Submersibles]

Thanks guys. The reason I asked is that my Co2 meter climbed up to a little
over 4,000 Quicker than I thought it should but from what you have said,
this seems normal. I was starting to wonder if my new Co2 meter was wrong.
What I can't understand is that it climbed fast while laying down but when
I sat upright, the meter walked slowly down to 1,000.??

Rick

On Thu, May 29, 2025 at 2:51 AM Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
>
> Besides others, Steve McQueen ran that scenario in his K250 and reported
> on it at PC2021 in Orlando.  In a sealed hatch test without O2 or scrubber,
> he reached 5000ppm in 14 minutes and 10000ppm in 30 minutes.  The O2 had
> depleted to 19.5% at 34 minutes.
>
> You have slightly more volume in your K350 but should find similar
> results.  In the old days (before these measured tests) we used to say you
> could stay underwater in a K350 for about 30 minutes before surfacing to
> refresh the air inside, which seems to be confirmed by Steve's tests.
> Important to understand that Steve's test represents one person, at rest
> with no stress.  Adding a passenger, moving around, and/or stressful
> situations will increase your breathing rate and reduce time to max/min
> levels.
>
> Jon
>
>
>
> On Wednesday, May 28, 2025 at 10:30:52 PM EDT, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Does anyone remember who sat in their sub with the hatch closed to see how
> long they could stay before the Co2  PPM became dangerous?
>
> Rick
>
> On Fri, May 23, 2025 at 9:22 AM Rick Patton <satwelder at gmail.com> wrote:
>
> Someone posted a while ago that they sat or layed in their sub until the
> PPM got dangerous.
> Can't remember who that was? Wanted to get more information from them if
> possible.
> Thanks
>
> Rick
>
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