<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>I just by O2 based on cubic foot. Mine are filled to 2,000 psi. My sub carries a total of 160cuft.</div>
<div>Thanks,</div>
<div>Scott Waters </div>
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<DIV id=wmQuoteWrapper>-------- Original Message --------<BR>Subject: Re: [PSUBS-MAILIST] Life support<BR>From: Alan James via Personal_Submersibles<BR><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>Date: Wed, April 23, 2014 11:59 am<BR>To: Personal Submersibles General Discussion<BR><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR><BR>
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<DIV><SPAN>Scott,</SPAN></DIV>
<DIV style="FONT-SIZE: 18px; FONT-FAMILY: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Carsten's tank size is based on a fill of 3000psi.</SPAN></DIV>
<DIV style="FONT-SIZE: 18px; FONT-FAMILY: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent">My dive shop will only fill O2 to 2000psi. </DIV>
<DIV style="FONT-SIZE: 18px; FONT-FAMILY: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent">Find out where you are most likely to get the tank</DIV>
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<DIV style="FONT-SIZE: 18px; FONT-FAMILY: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent">I had to do an O2 providers course before they</DIV>
<DIV style="FONT-SIZE: 18px; FONT-FAMILY: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent">would fill my tanks.</DIV>
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<FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> "Carsten Standfuß " via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, April 24, 2014 5:43 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-MAILIST] Life support<BR></FONT></DIV>
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<DIV><FONT size=2 face="Courier New">Hi Sean, <BR clear=none><BR clear=none>in praxis we use 0,25 l/min or (0,25 x 60=) 15 L/h O2 per hour and person. <BR clear=none></FONT>15 l/h x 72 h = 1080 Liters. Divided by a pressure in the bottle of 200 atm. is a 5 Liter bottle per person for emergency storage only. <BR clear=none><BR clear=none>This is close to the GL figure for resting person. <BR clear=none><BR clear=none>But if you are in a emergency 72 hour situation one person will rest and all other sleep..<BR clear=none>So on more than one person sub the figures over 72 hours will be lower. <BR clear=none><BR clear=none>By the way -if I am in Sgt.Peppers the flowmeter is some what by 0,2 L/h.. <BR clear=none><BR clear=none>Emile can give you actual flowmeter figures for a three person sub. <BR clear=none><BR clear=none>vbr Carsten <FONT size=2> - "If you are not sure - double it.." (unkown submarine engineer)</FONT> <BR clear=none><BR clear=none><BR clear=none>"Sean T. Stevenson via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> schrieb:
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<DIV class=yiv9620705450moz-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 clear=none><BR clear=none>Per (8/7.1), oxygen: 0.038 kg (0.084 lb) per hour, per person, at 1 atm.<BR clear=none><BR clear=none>x 72 hours emergency duration = 2.736 kg (6.032 lb) per person for 72 hours.<BR clear=none><BR clear=none>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 clear=none><BR clear=none>= 68 cubic feet oxygen per person for emergency reserve, additional oxygen appropriate to mission duration.<BR clear=none><BR clear=none>Sean<BR clear=none><BR clear=none><BR clear=none><BR clear=none>On 2014-04-22 17:52, swaters via Personal_Submersibles wrote:<BR clear=none></DIV>
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<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>
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<DIV>Is this right?</DIV>
<DIV>Thanks,</DIV>
<DIV>Scott Waters</DIV></BLOCKQUOTE></BLOCKQUOTE></DIV><FONT size=2 face="Courier New"> </FONT></DIV></DIV><BR>
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