[PSUBS-MAILIST] CO2 Sorb

Tue Aug 16 18:37:54 EDT 2016

And even more so 8,000 feet down where only 5 other operating submarines in the world can get to you and only a few ROV's can get to you. With Pisces VI we will have emergency rescue plans, but getting a ROV off a ship in the ocean, then loading on a cargo plane, then on a boat, then to the location of the accedent takes alot of time. Pisces III rescue extended them to the end of the 72 hour period and just about didn't make it out alive. I worry 5 days is enough, but any more starts to have major space problems inside the cockpit.Thank you,Scott Waters

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-------- Original message --------
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org> 
Date: 08/16/2016  5:25 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] CO2 Sorb 

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 escapefrom your sub & aren't too deep, it is a different scenario than being 1000ftdown with no hope of escape.Alan 

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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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