[PSUBS-MAILIST] scrubber performance

[Rick Patton via Personal_Submersibles]

Sounds good Hank. I agree the more redundancy the better when it comes to
life support. Any specific type recommended?

Rick

On Fri, Feb 17, 2017 at 7:54 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
> An altimeter is still a good idea, I think anyways.  First it will let you
> know if you have an over or under  pressure and it will never let you down,
> like electronics can.  The altimeter will verify what your instruments are
> telling you.  If your altitude is going up then your pressure is dropping
> witch means you add O2 .  If your altitude is dropping then your pressure
> is increasing witch means you are either adding to much O2 or your scrubber
> is not keeping up.  Relying on just an altimeter in not good either because
> you can get pressure changes from temperature changes.  The sub will drop
> in temperature in  cold water when you sink, that will cause a drop in
> pressure witch has nothing to do with environmental control.
> Hank
>
>
> On Friday, February 17, 2017 10:37 AM, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> If I have a good 02 and C02 sensor, should I still have an altimeter and
> how would I base the altimeter reading for adding 02?
>
> Rick
>
> On Fri, Feb 17, 2017 at 5:43 AM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> I don't recall seeing insulation in the DW2000 either.  Perhaps Phil will
> chime in on this?  It is possible that being so compact, the surface area
> of the DW hull is small enough that the contained heat loads can keep up to
> the moisture production.  Also, those are certified through GL, and as such
> may have different requirements than ABS's 30% - 70% RH.  Can anyone speak
> to the GL rules on this?  I can't see avoiding a 100 % RH environment, and
> the consequent condensation, when submerged in 5°C water without either
> insulating or employing dessicants to remove the moisture.  Immediately
> next to the hull, it will always be colder, so you may get condensation on
> the hull despite being within humidity limits on the cabin air on average.
> I was thinking that a cylindrical pressure hull would be relatively simple
> to insulate though, with something like AP Armaflex sheet material.  You
> wouldn't even necessarily need to apply at 100% coverage, but rather just
> enough to reduce the heat loss to meet the 70% RH limit at whatever your
> cabin temperature is. (14°C - 30°C are the recommended temperature limits,
> but that's not actually a rule under ABS UWVS). Insulating just the large
> cylindrical surfaces between frames might be sufficient.  In my own design,
> insulation is a necessity - otherwise I won't be able to keep my coffee hot.
>
> Sean
>
>
> On 2017-02-15 17:41, hank pronk via Personal_Submersibles wrote:
>
> Sean,
> I can not remember the temperature over the length of a typical dive.  I
> would estimate 10C after 1\2 hr at 100 feet.   When I dive Kootenay  lake
> it is probably 5C
> I wonder how DW's manage, they dive all over the world and I am sure in
> the winter.
> Hank
>
>
>
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