<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div><span>Thanks Antoine,</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2641" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2640">some good information there. I am intending to have a constant flow system that is topped</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2632" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2802">up via a re-breather style metering device. If the factory settings of the re-breather computer</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2745" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2744">can't be changed then plan 2 is to use a PLC to do the work. This may be the better option</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2718" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2717">as I could then have O2 level displays & alarms on one main HMI.</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2743" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2767">As for the problem of remembering to turn the O2 on; I think I will have a switch under the pilots</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2776" dir="ltr"><span id="yui_3_16_0_ym19_1_1465642642019_2832">chair, activated by </span><span id="yui_3_16_0_ym19_1_1465642642019_2782">the weight of the pilot. This will activate an alarm or warning if the O2 valve isn't open.</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2842" dir="ltr"><span>Alan</span></div><div id="yui_3_16_0_ym19_1_1465642642019_2821" dir="ltr"><span> </span></div><div id="yui_3_16_0_ym19_1_1465642642019_2737" dir="ltr"><span></span><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1465642642019_2585"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1465642642019_2601" style="display: block;"> <div id="yui_3_16_0_ym19_1_1465642642019_2600" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1465642642019_2599" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1465642642019_2598" dir="ltr"> <font id="yui_3_16_0_ym19_1_1465642642019_2597" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1465642642019_2596"> <b><span style="font-weight: bold;">From:</span></b> Antoine Delafargue 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> Saturday, June 11, 2016 6:09 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] Cornelius compressors<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1465642642019_2635"><br><div id="yiv6851569224"><div id="yui_3_16_0_ym19_1_1465642642019_2634">hi Alan<div id="yui_3_16_0_ym19_1_1465642642019_2633">You re right in a small cabin if Something is wrong in the oxy you have less time to react before o2 level drops too low or goes too high, so rb automatic systems can help and keep you alive if you fall unconscious. </div><div id="yui_3_16_0_ym19_1_1465642642019_2637">But:<div id="yui_3_16_0_ym19_1_1465642642019_2639">-one of the main failures rb systems are designed to address is much less present in subs: o2 cells age fast at high oxygen partial pressures and fail to record high oxygen partial pressures which can trick into injection of too much oxy</div><div id="yui_3_16_0_ym19_1_1465642642019_2636">-oxy variations in rb are much larger than in a small 1atm sub</div><div id="yui_3_16_0_ym19_1_1465642642019_2638">-statistics of rb accidents tend to say that the automatic systems with solenoids are not safer than manual add systems. They might induce more complacency and have divers forgeting to check things. manual add on (like reabreather ´adv' system which can be also used to make a bellow add type ) systems coupled with constant flow (pediatric regulator) to cover minimal rate make you alert while giving you more time to react and perhaps decrease the chance you forget to turn o2 on which has been a cause of several rb deaths. </div><div id="yui_3_16_0_ym19_1_1465642642019_2857"> -it would be easy to use rb equipment in a sub, although some factory settings for O2 level alarms may have to be changed. But it is difficult to find spare parts if you do not own a unit and certification, other than on second hand market like cave diving forums. parts on rb accessory shops like <a href="http://tecme.de/" target="_blank" rel="nofollow" shape="rect">tecme.de</a> or golem are an option but can be expensive.</div><div>The good thing with rb stuff though is their o2 cells have hydrophobic membranes for keeping condensed water away and give PpO2 on a large range or absolute pressure and O2.</div><div>stand alone monitors like revo dream coming with HUD display could be good.</div>Doing some rb diving course with the system you want to use can be very helpful... I did it with APdiving rb. <br clear="none"><div><br clear="none"></div><div>Regards</div><div>antoine</div><div class="yiv6851569224yqt2730177789" id="yiv6851569224yqt02177"><div><br clear="none">On Saturday, June 11, 2016, Alan James via Personal_Submersibles <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><blockquote class="yiv6851569224gmail_quote" style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div><span>Yes.</span></div><div><span>Cliff has a system that reads off one O2 sensor & seems to work fine, but I</span></div><div dir="ltr"><span>want the redundancy I will get with three O2 sensors as per a rebreather. It is a bit</span></div><div dir="ltr"><span>more complicated as if one O2 sensor is reading out of sync with the other two</span></div><div dir="ltr"><span>it will take the measurements from those two as Gospel. So I want to use a </span></div><div dir="ltr"><span>rebreather module that already has the algorithm for that. </span></div><div dir="ltr"><span>The bellows add system relies on cabin pressure which can fluctuate for </span></div><div dir="ltr"><span>reasons other than a variation in the O2 levels. And because my sub is so small any</span></div><div dir="ltr"><span>atmospheric conditions are going to fluctuate more quickly than </span><span>a larger sub,</span></div><div dir="ltr"><span>hence the need for a reliable system that responds to changes quickly.</span></div><div dir="ltr"><span>There is a bit of a blurb on the system AP developed for James Cameron here.</span></div><div dir="ltr"><span><a href="http://www.apdiving.com/en/trip-report-apd-provide-the-life-support-for-james-camerons-deepest-dive-march-2012/" target="_blank" rel="nofollow" shape="rect">James Cameron's Deepsea Challenge. Marianna Trench Trip Report Mar 2012</a></span></div><div><br clear="none"></div><div dir="ltr"> <a style="color: rgb(0, 0, 0) !important; text-decoration: none !important;" href="http://www.apdiving.com/en/trip-report-apd-provide-the-life-support-for-james-camerons-deepest-dive-march-2012/" target="_blank" rel="nofollow" shape="rect"> <table style="max-width: 400px;" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td width="400" rowspan="1" colspan="1"> <table width="100%" style="background: rgb(255, 255, 255); border-width: 1px 1px 3px; border-style: solid; border-color: rgb(224, 228, 233) rgb(224, 228, 233) rgb(0, 0, 0); max-width: 400px;" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td style="padding: 16px 0px 16px 12px; vertical-align: top;" rowspan="1" colspan="1"> </td><td style="padding: 16px 12px; width: 99%; vertical-align: middle;" rowspan="1" colspan="1"> <h2 style="margin: 0px 0px 4px;">James Cameron's Deepsea Challenge. Marianna Trench Trip Report Mar 2012</h2> <div style="color: rgb(153, 153, 153); line-height: 15px; font-size: 11px;"></div> </td><td rowspan="1" colspan="1"></td></tr></tbody></table> </td></tr></tbody></table> </a></div><div>Cheers Alan<br clear="none"></div><div dir="ltr"><span></span><br clear="none"></div><div dir="ltr"><span></span><br clear="none"></div><div><br clear="none"><br clear="none"></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font face="Arial" size="2"> </font><hr size="1"> <b><span style="font-weight: bold;">From:</span></b> Al Secor via Personal_Submersibles <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, June 11, 2016 12:28 PM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Cornelius compressors<br clear="none"> </div> <div><br clear="none">Isn't that what people are basically doing already? Whether you are using a flow meter, needle valve, mpu controlled solenoid valve or bellows add system ala Dr Phil, you are basically adding O2 at your metabolic rate the same as a rebreather would do...<br clear="none"><br clear="none">Al Secor<br clear="none"><br clear="none">--------------------------------------------<br clear="none">On Fri, 6/10/16, Alan James via Personal_Submersibles <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"> Subject: Re: [PSUBS-MAILIST] Cornelius compressors<br clear="none"> To: "Personal Submersibles General Discussion" <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>><br clear="none"> Date: Friday, June 10, 2016, 6:34 PM<br clear="none"> <br clear="none"> Thanks<br clear="none"> Steve.How<br clear="none"> easy would it be to adapt a rebreather O2 feed system to a<br clear="none"> submarine?I<br clear="none"> believe APdiving in the UK did this for James Cameron's<br clear="none"> sub.I'm<br clear="none"> building a one person sub about the size of Cliff's R300<br clear="none"> & because of the small size,wanted<br clear="none"> a system that responded quickly to O2 deviations.I<br clear="none"> envisage the system as having a constant flow of O2 at a<br clear="none"> rate just below my minimumconsumption,<br clear="none"> with a top up from readings off 3 O2 sensors.Cheers<br clear="none"> Alan<br clear="none"> <br clear="none"> <br clear="none"> From: Stephen Fordyce<br clear="none"> via Personal_Submersibles<br clear="none"> <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>><br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion<br clear="none"> <<a href="" rel="nofollow" shape="rect">personal_submersibles@psubs.org</a>> <br clear="none"> <br clear="none"> Sent: Friday,<br clear="none"> June 10, 2016 4:26 PM<br clear="none"> Subject:<br clear="none"> [PSUBS-MAILIST] Cornelius compressors<br clear="none"> <br clear="none"> <br clear="none"> Hi<br clear="none"> all,I<br clear="none"> know Hank uses a Cornelius compressor and I think others<br clear="none"> have enquired after them. In a nutshell, it's a<br clear="none"> small/lightweight (~60lb?) high-pressure compressor no<br clear="none"> longer made, originally used by the US Air Force in aircraft<br clear="none"> - so it's pretty well spec'd. Also by default<br clear="none"> runs off nominal 27VDC - so highly suitable for install in<br clear="none"> a PSUB, if you can handle the current draw, noise and 2cfm<br clear="none"> flowrate.<br clear="none"> Well<br clear="none"> in the course of my business, I sold a SCUBA nitrox mixing<br clear="none"> stick to a guy in Canada who mounted it on a Cornelius<br clear="none"> compressor - see a picture of the final setup he sent me (if<br clear="none"> the recent discussions of email vs Facebook haven't put<br clear="none"> you off!):<a href="https://www.facebook.com/tfmengineeringaust/photos/a.754931991306953.1073741830.754476911352461/858648047602013/?type=3&theater" target="_blank" rel="nofollow" shape="rect">https://www.facebook.com/tfmengineeringaust/photos/a.754931991306953.1073741830.754476911352461/858648047602013/?type=3&theater</a><br clear="none"> Anyway, we<br clear="none"> got to talking and he said he got the compressor from a<br clear="none"> bloke in Florida. I made contact and discovered this<br clear="none"> bloke has a whole lot of them that he is slowly setting<br clear="none"> up and selling as fully functional breathing air compressors<br clear="none"> (they are old but apparently well preserved and have only a<br clear="none"> few hours - he runs them in). He also has parts as well<br clear="none"> for anyone like Hank who already has a unit. I'm<br clear="none"> contemplating bringing a few into Australia to<br clear="none"> on-sell.<br clear="none"> In case<br clear="none"> anyone is interested, his name is Paul Deverell, with email<br clear="none"> <a href="" rel="nofollow" shape="rect">pauldeverell@ymail.com</a><br clear="none"> and phone number +1 786-367-3365<br clear="none"> Cheers,Steve<br clear="none"> _______________________________________________<br clear="none"> Personal_Submersibles mailing list<br clear="none"> <a href="" rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none"> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> -----Inline Attachment Follows-----<br clear="none"> <br clear="none"> _______________________________________________<br clear="none"> Personal_Submersibles mailing list<br clear="none"> <a href="" rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none"> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="" rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div> </div> </div> </div></div></div></blockquote></div></div></div></div></div><br><div class="yqt2730177789" id="yqt08119">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>