[PSUBS-MAILIST] CO2 Sorb

Tue Aug 16 18:25:14 EDT 2016

DNV-GL specify 4 days plus mission time. ABS 3 days.
Graham Hawkes new "dragon" submersible has 24 hrs scrubbing time.
This statistic  isn't well advertised & you have to search in the faq to find it.
I don't know how people come to their conclusions.
Didn't the original k boats have no scrubbing & just come up after an hour?
I guess it is largely depth dependant. If you are confident to be able to escape
from your sub & aren't too deep, it is a different scenario than being 1000ft
down with no hope of escape.
Alan 

Sent from my iPad

> On 17/08/2016, at 10:03 am, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I'm not sure how you're doing with your weight budget, but the Sodasorb weight really can become a space and weight issue when smaller boats go for compliance with the 72 hour rule. I know there's a competing product that's something like a pre-impregnated fabric instead of granules. Sorry, I can't recall the brand name. But it would be interesting to compare the weight and volume implications.
> 
> 
> Thanks,
> 
> Alec
> 
>> On Tue, Aug 16, 2016 at 3:54 PM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Thanks Cliff. I was also running the numbers on Pisces VI. We will have the following for 1 pilot and 3 observers for a 8 hour mission time and 5 day emergency use
>> *400 cuft O2 outside hull emergency use (five 80cuft tanks)
>> *160-81 cuft O2 inside hull for up to 8hr mission use (two 80cuft bottles allowing for full discharge)
>> *144 lbs sodasorb emergency use (three 48lb jugs)
>> *12 lbs sodasorb for up to 8hr mission use (two scrubbers loaded)
>> 
>> Thank you,
>> Scott Waters
>> 
>> >  -------Original Message-------
>> >  From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
>> >  To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> >  Subject: Re: [PSUBS-MAILIST] CO2 Sorb
>> >  Sent: Aug 16 '16 14:14
>> >
>> >  Scott, ABS  uses  a value of 0.115 lbm CO2  generated per hour per
>> >  occupant.  Sotasorb HP specification says it can absorb 41% CO2 by
>> >  weight.  This comes out to 3.56 Persons-hours per pound of SodaSorb HP
>> >  which is close the number Alec posted.  ABS rules call for full life
>> >  support for 72 hours plus normal duty time.  If you assume normal duty
>> >  time is 8 hours, then the life support system would need to last for
>> >  80 hours.  For one person this would give 22.5 lbs of SodaSorbHP and
>> >  for two, 45 lbs for this duration.
>> >
>> >  Actual consumption rate is dependent on a lot of parameters, such as
>> >  temperature, humidly, mass of occupants and design of scrubber to
>> >  mention just a few.
>> >
>> >  Cliff
>> >
>> >  On Tue, Aug 16, 2016 at 11:02 AM, via Personal_Submersibles
>> >  <personal_submersibles at psubs.org> wrote:
>> >
>> >  > Hey guys, Just doing a safety check. What is the rough amount of CO2
>> >  > sorb that is needed per occupant per day (normally measured in
>> >  > weight)? I have a 48lb jug in Trustworthy which I know is enough for
>> >  > 2 people for 3 days. I am just planning on putting it in premeasured
>> >  > sealed bags for better storage and was wondering about how much does
>> >  > it actually take.
>> >  >
>> >  > Thank you,
>> >  > Scott Waters
>> >  > _______________________________________________
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>> >  > Personal_Submersibles at psubs.org
>> >  > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> >
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