<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>No problem Sean,</div>
<div>I believe my amount it right, it just didn't look consistent with the rest of psubs, but just based on the little amounts of O2 that a lot of psubbers are carrying, I don't believe most are carrying enough sodasorb either. I came up with 23lbs per person (46 lbs total).</div>
<div>Thanks,</div>
<div>Scott Waters</div>
<div> </div>
<BLOCKQUOTE id=replyBlockquote style="FONT-SIZE: 10pt; FONT-FAMILY: verdana; COLOR: black; PADDING-LEFT: 8px; MARGIN-LEFT: 8px; BORDER-LEFT: blue 2px solid" webmail="1">
<DIV id=wmQuoteWrapper>-------- Original Message --------<BR>Subject: Re: [PSUBS-MAILIST] Life support<BR>From: "Sean T. Stevenson via Personal_Submersibles"<BR><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>Date: Wed, April 23, 2014 6:48 am<BR>To: Personal Submersibles General Discussion<BR><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR><BR>
<div dir=ltr>I'm sorry - I was short on time last night or I would have addressed the scrubbing as well. The design expected CO2 production rate is set by the rules in a similar manner. You need to look at the data sheet of your chosen scrubber media to find it's scrubbing capacity, efficiency, etc., then size the media volume accordingly (mission duration + 72 hours), and make sure that the flow path, flow rate / dwell time and so forth are sufficient to meet the rated capacity. Also, you might want to separate mission and emergency scrubbers to conserve media.</div>
<div dir=ltr>Sean<BR></div><BR><BR>
<DIV class=gmail_quote>On April 23, 2014 7:02:00 AM MDT, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
<BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; COLOR: #000000">
<DIV>Sean,</DIV>
<DIV>Seems like your results on O2 are the same that I found. I have (2) 80 cubic foot O2 tanks on my 2 man submarine. I am pretty sure most psubbers are not sticking to the mission time plus 72 hour requirement. I believe my figuring of 23 lbs of intersorb 812 per person is also close to correct and most psubbers are not carrying that as well. It seemed like a lot to me at the beginning based on my observations of other psubs, but I think it is correct.</DIV>
<DIV>Thanks,</DIV>
<DIV>Scott Waters</DIV>
<DIV> </DIV>
<BLOCKQUOTE id=replyBlockquote style="FONT-SIZE: 10pt; FONT-FAMILY: verdana; COLOR: black; PADDING-LEFT: 8px; MARGIN-LEFT: 8px; BORDER-LEFT: blue 2px solid" webmail="1">
<DIV id=wmQuoteWrapper>-------- Original Message --------<BR>Subject: Re: [PSUBS-MAILIST] Life support<BR>From: "Sean T. Stevenson via Personal_Submersibles"<BR><<A href="mailto:personal_submersibles@psubs.org" target=_blank>personal_submersibles@psubs.org</A>><BR>Date: Tue, April 22, 2014 8:13 pm<BR>To: Personal Submersibles General Discussion<BR><<A href="mailto:personal_submersibles@psubs.org" target=_blank>personal_submersibles@psubs.org</A>><BR><BR>
<DIV class=moz-cite-prefix>According to the ABS rules, per (11/35.3), you need sufficient oxygen for the mission duration PLUS the 72 hour reserve.<BR><BR>Per (8/7.1), oxygen: 0.038 kg (0.084 lb) per hour, per person, at 1 atm.<BR><BR>x 72 hours emergency duration = 2.736 kg (6.032 lb) per person for 72 hours.<BR><BR>2.736 kg x (1000g/kg) x (mol O2/31.9988g O2) x (22.4 liters / mol O2) = 1915 liters (@ STP, ideal gas assumptions)<BR><BR>= 68 cubic feet oxygen per person for emergency reserve, additional oxygen appropriate to mission duration.<BR><BR>Sean<BR><BR><BR><BR>On 2014-04-22 17:52, swaters via Personal_Submersibles wrote:<BR></DIV>
<BLOCKQUOTE cite=mid:2tj9lxn8f38awyavaxvv7unp.1398206846763@email.android.com type="cite">
<DIV>I have been trying to make sure I have suffecent life support for 72 hours per ABS. It seems like the research varys a little. </DIV>
<DIV>I am showing</DIV>
<DIV>*80 cubic feet of O2 per person</DIV>
<DIV>*23 lbs sodasorb per person</DIV>
<DIV><BR></DIV>
<DIV>Is this right?</DIV>
<DIV>Thanks,</DIV>
<DIV>Scott Waters</DIV></BLOCKQUOTE>
<HR>
_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org" target=_blank>Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV></BLOCKQUOTE></SPAN>
<div style="MARGIN-BOTTOM: 1em; BORDER-BOTTOM: #000 1px solid; MARGIN-TOP: 2.5em"></div><PRE class=k9mail><HR><BR>Personal_Submersibles mailing list<BR><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></PRE></BLOCKQUOTE></DIV>
<HR>
_______________________________________________<BR>Personal_Submersibles mailing list<BR><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><BR><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><BR></DIV></BLOCKQUOTE></span></body></html>