Per ABS, the inadvertent release of the contents of any single pressure vessel, if stored internally, must not raise the internal cabin pressure more than 1 atm (101.325 kPa) above the normal atmospheric pressure, nor raise the cabin air oxygen concentration above 23.5%. If an oxygen cylinder does not meet these requirements, it must be stored externally.<br><br>So, you can get away with storing any amount internally, provided you use a greater number of smaller vessels.<br><br>Sean<br><br><br>-------- Original Message --------<br>On Jan 3, 2018, 18:15, Brian Cox via Personal_Submersibles < personal_submersibles@psubs.org> wrote:<blockquote class="protonmail_quote"><br><html><head></head><body><div style="font-family:Arial, sans-serif; font-size:10pt;"><div>Alan, It's a long list ! What I need to do is make a check list of things I have wrong ;-) and then "things I have wrong but can maybe slide on" ! One question, right of the bat, with that O2 not being able to fill the cabin space more than one atmosphere, I'm not understanding the terminology , how can it be possible to release a volume of air from a bottle WITHOUT raising the pressure above one atm if your are already at one atm ?</div><div> </div><div>I should go around my sub with a video camera inside and out and you could really get an idea of what I need ! For instance I know I need an additional ballast tank HP cylinder. </div><div> </div><div>Brian </div><div> </div><div><br><br>--- personal_submersibles@psubs.org wrote:<br><br>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical<br>Date: Thu, 4 Jan 2018 13:52:57 +1300<br><br></div><div>Brian,</div><div>fire away; there are a few people on psubs that are familiar with GL & or</div><div>ABS. </div><div>Alan<br><br>Sent from my iPad</div><div><br>On 4/01/2018, at 1:37 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div style="font-family: Arial, sans-serif; font-size: 10pt;"><div>Great info Alan ! BTW I need to pick your brain on some of the Lloyd's or ABS regs or equivalent.</div><div> </div><div>Brian</div><div> </div><div> <br><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical<br>Date: Thu, 4 Jan 2018 13:22:59 +1300<br><br></div><div>Brian, </div><div>here is a link with some info.</div><div><a href="https://www.padi.com/padi-courses/emergency-oxygen-provider">https://www.padi.com/padi-courses/emergency-oxygen-provider</a></div><div>The best way about it is to enquire at your local dive shop as they will </div><div>probably run a course if they have a few interested people.</div><div>Alan</div><div><br><br>Sent from my iPad</div><div><br>On 4/01/2018, at 1:04 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div>Brian,</div><div>I did an Emergency O2 providers course at a dive shop that sold O2.</div><div>Now have a card with my face on it.</div><div>I don't know if there are any regulations, but I get on well with the manager</div><div>& this is what he was happy with me doing before he would fill O2.</div><div>This was the easiest option, cheap & Only a couple of nights. </div><div>I think if I went to any dive shop in the World & pulled out my Padi O2 card</div><div>they would be happy to fill. Also we are carrying O2 so are able to provide it</div><div>in a diving emergency, so thats an advantage to divers.</div><div>Medical O2 providers may also be convinced to fill for you if you have the card.</div><div>The other option for me was to do a mixed gas diving course which is much</div><div>more expensive & intense.</div><div>Cheers Alan</div><div> </div><div><br>Sent from my iPad</div><div><br>On 4/01/2018, at 12:16 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div style="font-family: Arial, sans-serif; font-size: 10pt;"><div>Alan, What's involved with getting a O2 cert for administering O2 ?</div><div> </div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical<br>Date: Thu, 4 Jan 2018 11:21:46 +1300<br><br></div><div>Steve,</div><div>not the most experienced but this is what I'm doing.</div><div>I have 2 steel O2 cleaned tanks. ( 2 tanks as per GL for redundancy)</div><div>I have O2 cleaned scuba regulators & get my tanks filled at a dive shop.</div><div>Had to have an emergency O2 provider cert first.</div><div>I believe Nuytco were using composite tanks at one stage.</div><div>O2 tank options & fitting options here. (EMT medical)</div><div><a href="http://www.emtmedicalco.com/OXYGEN-CYLINDERS-ALUMINUM-STEEL-COMPOSITE_c64.htm">http://www.emtmedicalco.com/OXYGEN-CYLINDERS-ALUMINUM-STEEL-COMPOSITE_c64.htm</a></div><div>You will need a tank fitting suitable for where you intend filling i.e. dive shop</div><div>or medical O2 supplier. Then you will need a compatible regulator . If you were </div><div>heading across country for a few dives maybe have interchangeable fittings or </div><div>spare tanks with different fittings if you need to switch between medical & dive</div><div>suppliers. ( I haven't heard this discussed before) </div><div>I have heard people say that medical & commercial O2 tank swap people don't</div><div>like the idea of their tanks going under the water. They also may require some</div><div>sort of certificate from you before they fill.</div><div>Have read of deaths from people using commercial rather than medical O2, but</div><div>this would be 100% O2 inhaled straight in to the lungs.</div><div>Phil offered to sell his O2 add system to Psubbers.</div><div>I am using a paediatric flow meter set at a minimal flow & are topping up via</div><div>3 x O2 sensors wired to my PLC & operating a solenoid valve on the low pressure </div><div>O2 line. The PLC will be comparing the 3 readings & going with the average of</div><div>the 2 readings closest to each other. The PLC will notify me when the range of</div><div>one O2 sensor is out relative to the other 2 or the reading of the nearest 2 differ </div><div>by a certain amount & may need replacing. I think the life of a sensor is only</div><div>a year or so depending on the heat it is stored at. Being a small one person sub</div><div>I need to be a lot more careful as the O2 % can change a lot more quickly.</div><div>Cheers Alan</div><div><br></div><div><br></div><div><br><br><div>Sent from my iPad</div></div><div><br>On 4/01/2018, at 7:10 AM, Steve McQueen via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><span>I tried to search the archives but it wasn't very friendly. Sorry to again ask about something I know has probably been discussed.</span><br><span></span><br><span>I wanted to double ck. my O2 strategy. After some investigation it seems I will buy a new steel high pressure oxygen tank for external mounting. My plan is to have it refilled with "commercial grade" O2 vs. medical grade 02. As long as I keep my "personal" tank and not allow the filler to swap tanks I should create a "chain of custody" that will help me feel good about not having contamination.</span><br><span></span><br><span>I am wondering how others are managing.</span><br><span></span><br><span>Thanks,</span><br><span>Steve</span><br><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>_______________________________________________
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