<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>DNV-GL specify 4 days plus mission time. ABS 3 days.</div><div>Graham Hawkes new "dragon" submersible has 24 hrs scrubbing time.</div><div>This statistic isn't well advertised & you have to search in the faq to find it.</div><div>I don't know how people come to their conclusions.</div><div>Didn't the original k boats have no scrubbing & just come up after an hour?</div><div>I guess it is largely depth dependant. If you are confident to be able to escape</div><div>from your sub & aren't too deep, it is a different scenario than being 1000ft</div><div>down with no hope of escape.</div><div>Alan <br><br>Sent from my iPad</div><div><br>On 17/08/2016, at 10:03 am, Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">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.<div><br></div><div><br></div><div>Thanks,<br><br>Alec</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 16, 2016 at 3:54 PM, via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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<br>
*400 cuft O2 outside hull emergency use (five 80cuft tanks)<br>
*160-81 cuft O2 inside hull for up to 8hr mission use (two 80cuft bottles allowing for full discharge)<br>
*144 lbs sodasorb emergency use (three 48lb jugs)<br>
*12 lbs sodasorb for up to 8hr mission use (two scrubbers loaded)<br>
<br>
Thank you,<br>
Scott Waters<br>
<span class=""><br>
> -------Original Message-------<br>
> From: Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
> To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
> Subject: Re: [PSUBS-MAILIST] CO2 Sorb<br>
</span><div><div class="h5">> Sent: Aug 16 '16 14:14<br>
><br>
> Scott, ABS uses a value of 0.115 lbm CO2 generated per hour per<br>
> occupant. Sotasorb HP specification says it can absorb 41% CO2 by<br>
> weight. This comes out to 3.56 Persons-hours per pound of SodaSorb HP<br>
> which is close the number Alec posted. ABS rules call for full life<br>
> support for 72 hours plus normal duty time. If you assume normal duty<br>
> time is 8 hours, then the life support system would need to last for<br>
> 80 hours. For one person this would give 22.5 lbs of SodaSorbHP and<br>
> for two, 45 lbs for this duration.<br>
><br>
> Actual consumption rate is dependent on a lot of parameters, such as<br>
> temperature, humidly, mass of occupants and design of scrubber to<br>
> mention just a few.<br>
><br>
> Cliff<br>
><br>
> On Tue, Aug 16, 2016 at 11:02 AM, via Personal_Submersibles<br>
> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
><br>
> > Hey guys, Just doing a safety check. What is the rough amount of CO2<br>
> > sorb that is needed per occupant per day (normally measured in<br>
> > weight)? I have a 48lb jug in Trustworthy which I know is enough for<br>
> > 2 people for 3 days. I am just planning on putting it in premeasured<br>
> > sealed bags for better storage and was wondering about how much does<br>
> > it actually take.<br>
> ><br>
> > Thank you,<br>
> > Scott Waters<br>
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