<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Steve,</div><div id="AppleMailSignature">I had some regulators O2 cleaned. The dive shop which specialised in technical</div><div id="AppleMailSignature">diving said they could only O2 clean certain regulators, & recommended a </div><div id="AppleMailSignature">couple of models. I believe someone on Psubs disagreed with this & thought</div><div id="AppleMailSignature">all regulators could be O2 cleaned, but that was my experience. I would suggest</div><div id="AppleMailSignature">you ask the dive shop you intend to deal with about this. </div><div id="AppleMailSignature">I wouldn't worry about an expensive regulator as you are not breathing from</div><div id="AppleMailSignature">it directly so the subtleties of performance would be of no use. </div><div id="AppleMailSignature">You need to monitor the contents of your tank, & a first stage regulator has</div><div id="AppleMailSignature">high pressure ports for your pressure gauge. I am not sure how Hank does this</div><div id="AppleMailSignature">with the O2 high pressure direct on to the sub; probably an internal gauge.</div><div id="AppleMailSignature">Another factor in the equation is where you are going to get the O2 filled.</div><div id="AppleMailSignature">If you are getting it filled at a dive shop, the tank will require a scuba type </div><div id="AppleMailSignature">fitting, & they may require some sort of certification. Even though I was a diver</div><div id="AppleMailSignature">I'm not qualified for mixed gas diving & they required me to do a " Emergency O2</div><div id="AppleMailSignature">provider" course. If you are intending to fill at a medical O2 supplier / industrial</div><div id="AppleMailSignature">gas supplier, then you will need a different tank fitting. </div><div id="AppleMailSignature">I am only feeding low pressure O2 to my hull, mainly because it is a one person sub </div><div id="AppleMailSignature">& the pressure could build up a lot quicker with a leak.</div><div id="AppleMailSignature">Cheers Alan</div><div id="AppleMailSignature"><br>Sent from my iPad</div><div><br>On 26/12/2017, at 6:50 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><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal">All, I am purchasing the system components for my K-250’s O2 system. I am not a SCUBA diver so I lack some experience with regulators. I am considering sealed/balanced options for the first stage regulator (it will create an intermediate pressure downstream of the O2 tank (located external of the hull). These get pricey and I don’t really want to overspend for options I do not need (sealed vs. not, balanced vs. unbalanced, O2 ready vs. needing cleaned).<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">A couple of questions:<o:p></o:p></p><ol style="margin-top:0in" start="1" type="1"><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">They sell regulators that are already suitable for 100% O2 use. How difficult to clean one that is not O2 ready?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The pediatric flow regulator (located in the hull) can directly handle the O2 tank pressure so I am wondering why we use the first stage regulators at all.<o:p></o:p></li><ol style="margin-top:0in" start="1" type="a"><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">I assume to remove as many HP leak sources from within the hull especially since it is 100% O2 (safety).<o:p></o:p></li></ol></ol><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Thoughts/recommendations?<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Steve<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p></div></div></blockquote><blockquote type="cite"><div><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>