<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Steve,</div><div id="AppleMailSignature">I wouldn't worry at all about external pressure on an alluminium</div><div id="AppleMailSignature">scuba tank. They are about 1/2" thick.</div><div id="AppleMailSignature"><a href="https://www.westenddivers.info/theblog/2017/10/28/tanks-padtj">https://www.westenddivers.info/theblog/2017/10/28/tanks-padtj</a></div><div id="AppleMailSignature">There is a cut-away in this article & the guy also says they are about</div><div id="AppleMailSignature">1/2" wall thickness. It could probably take as much externally as internally.</div><div id="AppleMailSignature">If I was guessing I would say it could go to 10,000 ft or more.</div><div id="AppleMailSignature">Cheers Alan<br><br>Sent from my iPad</div><div><br>On 5/01/2018, at 3:36 AM, Steve McQueen via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><span>Cliff, I bought an M60 aluminum O2 tank for external mounting (this was my "perfect" size but couldn't find in steel). However I am thinking about returning it because I have no "math" yet to support it can withstand say 180psi of external pressure (I do not know the wall thickness (yet, asked and am waiting, probably won't get)and the bottom is not rounded etc.). Probably being over concerned here but wanted to be able to defend my designs with data.</span><br><span></span><br><span>Did you have enough data on your aluminum tanks to do calculations?</span><br><span></span><br><span></span><br><span>Thanks,</span><br><span>Steve</span><br><span></span><br><span>---- Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote: </span><br><blockquote type="cite"><span>This summer, 5 miles offshore of Islamorada Florida, I spend 5 hours in my</span><br></blockquote><blockquote type="cite"><span>psub with the hatch closed the entire time. My life was totally in the</span><br></blockquote><blockquote type="cite"><span>hands of my life support system that was on full automatic control</span><br></blockquote><blockquote type="cite"><span>throughout the dive. The system worked flawlessly. The oxygen I used was</span><br></blockquote><blockquote type="cite"><span>commercial welding oxygen I transferred from a cylinder that gets swapped</span><br></blockquote><blockquote type="cite"><span>out every time I take it into the supplier. I use a whip that connects</span><br></blockquote><blockquote type="cite"><span>from the HP port of a standard welding regulator to a Swagelok connection</span><br></blockquote><blockquote type="cite"><span>on an external 1/4" SS tubing manifold that connects four externally</span><br></blockquote><blockquote type="cite"><span>mounted aluminum medical grade cylinders (2 D size and 2 E size). The HP</span><br></blockquote><blockquote type="cite"><span>(2,000 psig) oxygen comes through the pressure hull and then has a 1/4"</span><br></blockquote><blockquote type="cite"><span>high pressure Swagelok valve for isolation. From there the HP Oxygen</span><br></blockquote><blockquote type="cite"><span>passing directly into small box I call the AMOC unit. AMOC is an acronym</span><br></blockquote><blockquote type="cite"><span>for Atmospheric Monitoring and Oxygen Control. All life support sensors</span><br></blockquote><blockquote type="cite"><span>are installed in the AMOC module. These include the O2 pressure, O2 and CO2</span><br></blockquote><blockquote type="cite"><span>concentrations, relative humidly, cabin pressure, cabin temperature and O2</span><br></blockquote><blockquote type="cite"><span>flow rate in SLPM. The purpose of the O2 and CO2 sensors are to measure</span><br></blockquote><blockquote type="cite"><span>the partial pressure of oxygen and of carbon dioxide so that the</span><br></blockquote><blockquote type="cite"><span>programmable logic controller (PLC) in automatic mode and the pilot in</span><br></blockquote><blockquote type="cite"><span>manual mode can make the adjustments necessary to maintain the O2 and CO2</span><br></blockquote><blockquote type="cite"><span>levels within acceptable limits. Because the PLC has data logging, after</span><br></blockquote><blockquote type="cite"><span>returning from the Islamorada dive I was able to go back and study the life</span><br></blockquote><blockquote type="cite"><span>support system as well as all the other systems. Having all the life</span><br></blockquote><blockquote type="cite"><span>support systems sensors in a single module makes it easy for maintenance to</span><br></blockquote><blockquote type="cite"><span>pull the AMOC box out of the R300 and install an extension cord for the</span><br></blockquote><blockquote type="cite"><span>electrical signals between the AMOC unit and PLC box and fire up the system</span><br></blockquote><blockquote type="cite"><span>on the bench. To confirm the life support system was working, I had six</span><br></blockquote><blockquote type="cite"><span>different volunteers over a one year period with different metabolisms and</span><br></blockquote><blockquote type="cite"><span>with body weights from 90 lbs to 240 lbs closed up in the boat for over 50</span><br></blockquote><blockquote type="cite"><span>hours with full data logging to test the system. This enabled me tune the</span><br></blockquote><blockquote type="cite"><span>PID controller for O2 makeup and give me confidence that the system was</span><br></blockquote><blockquote type="cite"><span>working. It would not be fun but I am 100% confident I could stay confined</span><br></blockquote><blockquote type="cite"><span>in my boat for 80 hours and survive.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Cliff</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>On Wed, Jan 3, 2018 at 8:56 PM, Sean T. Stevenson via Personal_Submersibles</span><br></blockquote><blockquote type="cite"><span><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span>Although I have worked with some Allen-Bradley type PLCs using ladder</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>logic in the distant past, I work almost exclusively now with programmable</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>automation controllers (PACs), which incorporate on-board</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>field-programmable gate arrays (FPGA) on the same die as a CPU running a</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>deterministic real-time operating system (e.g. National Instruments</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>CompactRIO platform). These units are extremely versatile, although</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>considerably more expensive than a PLC. The FPGA, main real-time OS</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>program, and any PC / remote interface programs are all programmed with the</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>same software suite, which while accessable to beginners, is unfortunately</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>not a "master it in a weekend" type of deal - I have been developing for</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>these for twenty years.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>As for PLCs, I have been uninvolved for too long to give a useful</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>recommendation. Defer to someone who has done more recent research / usage.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sean</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>-------- Original Message --------</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On Jan 3, 2018, 19:38, Alan via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Thanks Sean,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>good stuff, I feel more confident about using commercial O2 now.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>the ABS 23.5 % is quite restrictive. The problem is one rule fits all</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>submarines.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>In a psub there is less that's likely to cause a fire than in a large</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>deisel electric</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>( like Carsten's). The chances of you emptying the contents of your O2 tank</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>& starting a fire at the same time are pretty slim.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>BTW have you come across the EZautomation Ezrack plc at all.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.ezautomation.net/ezrackplc/ezrackplc.htm">http://www.ezautomation.net/ezrackplc/ezrackplc.htm</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I am looking seriously at it. It says it is fully American! Is that good</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>or bad?</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Alan</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 4/01/2018, at 2:58 PM, Sean T. Stevenson via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Per ABS, the inadvertent release of the contents of any single pressure</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>vessel, if stored internally, must not raise the internal cabin pressure</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>more than 1 atm (101.325 kPa) above the normal atmospheric pressure, nor</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>raise the cabin air oxygen concentration above 23.5%. If an oxygen cylinder</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>does not meet these requirements, it must be stored externally.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>So, you can get away with storing any amount internally, provided you use</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>a greater number of smaller vessels.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sean</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>-------- Original Message --------</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On Jan 3, 2018, 18:15, Brian Cox via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Alan, It's a long list ! What I need to do is make a check list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>of things I have wrong ;-) and then "things I have wrong but can maybe</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>slide on" ! One question, right of the bat, with that O2 not being</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>able to fill the cabin space more than one atmosphere, I'm not</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>understanding the terminology , how can it be possible to release a volume</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>of air from a bottle WITHOUT raising the pressure above one atm if your are</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>already at one atm ?</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I should go around my sub with a video camera inside and out and you could</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>really get an idea of what I need ! For instance I know I need an</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>additional ballast tank HP cylinder.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>To: Personal Submersibles General Discussion <personal_submersibles@psubs.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>org></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Date: Thu, 4 Jan 2018 13:52:57 +1300</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>fire away; there are a few people on psubs that are familiar with GL & or</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>ABS.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Alan</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 4/01/2018, at 1:37 PM, Brian Cox via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Great info Alan ! BTW I need to pick your brain on some of the</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Lloyd's or ABS regs or equivalent.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>To: Personal Submersibles General Discussion <personal_submersibles@psubs.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>org></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Date: Thu, 4 Jan 2018 13:22:59 +1300</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>here is a link with some info.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="https://www.padi.com/padi-courses/emergency-oxygen-provider">https://www.padi.com/padi-courses/emergency-oxygen-provider</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>The best way about it is to enquire at your local dive shop as they will</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>probably run a course if they have a few interested people.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Alan</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 4/01/2018, at 1:04 PM, Alan via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I did an Emergency O2 providers course at a dive shop that sold O2.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Now have a card with my face on it.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I don't know if there are any regulations, but I get on well with the</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>manager</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>& this is what he was happy with me doing before he would fill O2.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>This was the easiest option, cheap & Only a couple of nights.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I think if I went to any dive shop in the World & pulled out my Padi O2</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>card</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>they would be happy to fill. Also we are carrying O2 so are able to</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>provide it</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>in a diving emergency, so thats an advantage to divers.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Medical O2 providers may also be convinced to fill for you if you have the</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>card.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>The other option for me was to do a mixed gas diving course which is much</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>more expensive & intense.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Cheers Alan</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 4/01/2018, at 12:16 PM, Brian Cox via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Alan, What's involved with getting a O2 cert for administering</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>O2 ?</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Brian</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>To: Personal Submersibles General Discussion <personal_submersibles@psubs.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>org></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Date: Thu, 4 Jan 2018 11:21:46 +1300</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Steve,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>not the most experienced but this is what I'm doing.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I have 2 steel O2 cleaned tanks. ( 2 tanks as per GL for redundancy)</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I have O2 cleaned scuba regulators & get my tanks filled at a dive shop.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Had to have an emergency O2 provider cert first.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I believe Nuytco were using composite tanks at one stage.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>O2 tank options & fitting options here. (EMT medical)</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.emtmedicalco.com/OXYGEN-CYLINDERS-ALUMINUM-">http://www.emtmedicalco.com/OXYGEN-CYLINDERS-ALUMINUM-</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>STEEL-COMPOSITE_c64.htm</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>You will need a tank fitting suitable for where you intend filling i.e.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>dive shop</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>or medical O2 supplier. Then you will need a compatible regulator . If you</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>were</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>heading across country for a few dives maybe have interchangeable fittings</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>or</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>spare tanks with different fittings if you need to switch between medical</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>& dive</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>suppliers. ( I haven't heard this discussed before)</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I have heard people say that medical & commercial O2 tank swap people don't</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>like the idea of their tanks going under the water. They also may require</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>some</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>sort of certificate from you before they fill.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Have read of deaths from people using commercial rather than medical O2,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>but</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>this would be 100% O2 inhaled straight in to the lungs.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Phil offered to sell his O2 add system to Psubbers.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I am using a paediatric flow meter set at a minimal flow & are topping up</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>via</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>3 x O2 sensors wired to my PLC & operating a solenoid valve on the low</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>pressure</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>O2 line. The PLC will be comparing the 3 readings & going with the average</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>of</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>the 2 readings closest to each other. The PLC will notify me when the</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>range of</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>one O2 sensor is out relative to the other 2 or the reading of the nearest</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>2 differ</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>by a certain amount & may need replacing. I think the life of a sensor is</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>only</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>a year or so depending on the heat it is stored at. Being a small one</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>person sub</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I need to be a lot more careful as the O2 % can change a lot more quickly.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Cheers Alan</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 4/01/2018, at 7:10 AM, Steve McQueen via Personal_Submersibles <</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I tried to search the archives but it wasn't very friendly. Sorry to</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>again ask about something I know has probably been discussed.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I wanted to double ck. my O2 strategy. After some investigation it seems</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I will buy a new steel high pressure oxygen tank for external mounting. My</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>plan is to have it refilled with "commercial grade" O2 vs. medical grade</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>02. As long as I keep my "personal" tank and not allow the filler to swap</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>tanks I should create a "chain of custody" that will help me feel good</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>about not having contamination.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>I am wondering how others are managing.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Thanks,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Steve</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________ Personal_Submersibles</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>mailing list <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a> <a href="http://www.psubs.org/mailman/">http://www.psubs.org/mailman/</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>listinfo.cgi/personal_submersibles</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________ Personal_Submersibles</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>mailing list <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a> <a href="http://www.psubs.org/mailman/">http://www.psubs.org/mailman/</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>listinfo.cgi/personal_submersibles</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________ Personal_Submersibles</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>mailing list <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><<a href="http:///eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org">http:///eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org</a>></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Personal_Submersibles mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>