<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div><span>Scott,</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>Carsten's tank size is based on a fill of 3000psi.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">My dive shop will only fill O2 to 2000psi. </div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">Find out where you are
most likely to get the tank</div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">filled & ask what pressure they will fill to.</div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">I had to do an O2 providers course before they</div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">would fill my tanks.</div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
background-color: transparent; font-style: normal;">Alan</div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> "Carsten Standfuß " via Personal_Submersibles" <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <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> <div class="y_msg_container"><br><div id="yiv9620705450"><title>E-Mail Software 6.0</title><div><font
face="Courier New" size="2">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"
<personal_submersibles@psubs.org> schrieb:
<div class="yiv9620705450yqt0026248456" id="yiv9620705450yqt66965"><blockquote style="PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:#000000 2px solid;PADDING-RIGHT:0px;MARGIN-RIGHT:0px;">
<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>
<blockquote 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 clear="none">
</div>
<div>Is this right?</div>
<div>Thanks,</div>
<div>Scott Waters</div>
</blockquote>
</blockquote></div>
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