<div dir="ltr"><div>Hello</div><div><br>I have a pressure reducing regulator connected to a manifold that allows me to connect 2x tanks and set whatever pressure I want. </div><div> </div><div><a href="http://www.guernseysubmarine.com/Extended_files/Page15335.htm">http://www.guernseysubmarine.com/Extended_files/Page15335.htm</a><span></span></div><div> </div><div>Its nice and works well, but it was expensive and if I was doing this again, I wouldn't bother with the regulator and just pipe the manifold to the main pipes. In fact, I probably wouldn't even bother with the manifold as when I dive, I have one tank connected to emergency scuba anyway. If I need the second tank, I swap it out underwater. Only had to do it once.</div><div><span></span> </div><div><span>Keep it simple.</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 14 October 2016 at 00:59, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Correction, you won't be able to put air in your ballast tank</div><div>below 200ft with a 100psi regulator inside the hull.</div><span><div>Alan<br><br>Sent from my iPad</div></span><div><div class="h5"><div><br>On 14/10/2016, at 12:53 pm, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div>Mark,</div><div>sorry if I am insulting your intelligence here, but if you have a </div><div>standard regulator inside the hull reducing the pressure to 100</div><div>psi then you won't be able to blow your ballast tanks below 50ft.</div><div>As Steve suggests, a scuba first stage regulator will give you</div><div>130 psi above the ambient water pressure, enabling you to put</div><div>air in your ballast tanks at any depth.</div><div>Just mentioning this because this mistake has been made before.</div><div>Cheers Alan</div><div><br><br>Sent from my iPad</div><div><br>On 14/10/2016, at 11:55 am, Stephen Fordyce via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Hi Mark,</div><div>Most SCUBA regulator first stages (the bit that goes onto a tank) will drop the pressure to about 150PSI, and you could happily adjust most of them to 100PSI instead.</div><div><br></div><div>Bear in mind a regulator adds lots of different failure modes and if your shutoff is after the regulator you may well lose all the gas in the cylinder if there is a failure. Probably doesn't matter in your case! This is also a reason regulators have an overpressure valve (OPV) - in case they fail open and deliver full cylinder pressure into the low pressure downstream line. Quite important if you don't have a SCUBA second stage (that bit that goes in your mouth) installed.</div><div><br></div><div>Also after the regulator there is no way of knowing what's left in the cylinder. A contents gauge is only useful on the high pressure side.</div><div><br></div><div>A useful resource for dealing with SCUBA regulators: <a href="http://www.airspeedpress.com/newregbook.html" target="_blank">http://www.airspeedpress.com/<wbr>newregbook.html</a></div><div><br></div><div>The cheapest SCUBA regulators are for argon and/or drysuit inflation. Ie: <a href="https://www.divegearexpress.com/inflation-regulator-w-opv" target="_blank">https://www.divegearexpress.<wbr>com/inflation-regulator-w-opv</a></div><div>They are not adjustable (but generally set to lower pressure, more like 100-125PSI) and often have slightly less flow. I don't think the difference would be particularly significant for you. They also tend to be 200bar DIN - so if you have a 300bar DIN valves they won't fit.</div><div><br></div><div>SCUBA regulators for breathing are more expensive, but have higher flows and are meant to be more reliable, and adjustable. You'd be looking for a DIN "first stage" (they are pretty much all dual 200/300bar compatible) and then you'll have to get a separate OPV. Ie:</div><div><a href="https://www.divegearexpress.com/regulators-spgs" target="_blank">https://www.divegearexpress.<wbr>com/regulators-spgs</a></div><div><br></div><div>You'll also need one of these adaptors to turn the regulator outlet into NPT: <a href="https://www.divegearexpress.com/adapter-1-4-inch-npt-female-3-8-inch-m" target="_blank">https://www.divegearexpress.<wbr>com/adapter-1-4-inch-npt-<wbr>female-3-8-inch-m</a></div><div><br></div><div>Cheers,</div><div>Steve</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Oct 14, 2016 at 12:55 AM, Mark via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>></span> wrote:<br><blockquote class="gmail_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 dir="auto"><div>Steve,</div><div id="m_5245259342992521832m_8870378515907829364AppleMailSignature"><br></div><div id="m_5245259342992521832m_8870378515907829364AppleMailSignature">Thanks for the clarification on the DIN connector. In terms of the pressure regulator, what device do most people use to regulate the air pressure? Is this something I could purchase from a SCUBA parts supply company? <span><br><br><div>Regards,</div><div><br></div>Mark Widman<div><a href="tel:910-638-5229" target="_blank" value="+19106385229">910-638-5229</a></div><div><div><br></div><div>Sent from iPhone.</div></div></span></div><div><div class="m_5245259342992521832h5"><div><br>On Oct 13, 2016, at 9:17 AM, Sean T. Stevenson via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> wrote:<br><br></div><blockquote type="cite"><div><p dir="ltr">300 is short for 300 bar, or the recommended maximum pressure of the fitting, indicating that it is a deeper thread than 200/232 bar fittings. The latter can be used with yoke style regulators (CGA-850) by using an insert in the female DIN on the tank valve. The 300 bar connection, being deeper, precludes this but is stronger. Similarly, if you have a 300 bar DIN fitting on your regulator, and screw it into a 200 bar DIN tank valve, it is compatible, but will show a couple of exposed threads which can be entrapment points.</p>
<p dir="ltr">DIN 477 is the actual thread specification. Rarely seen in SCUBA equipment catalogs, but necessary if you're going to have a DIN thread machined.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On October 13, 2016 6:26:49 AM MDT, Mark via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
<div><div><span style="background-color:rgba(255,255,255,0)">Thanks Steve,</span></div><div><span style="background-color:rgba(255,255,255,0)"><br></span></div><div><span style="background-color:rgba(255,255,255,0)">This is exactly what I'm looking for.</span></div><div><span style="background-color:rgba(255,255,255,0)">(1/4" m NPT x DIN 300 m)</span></div><div><span style="background-color:rgba(255,255,255,0)"><br></span></div><div><span style="background-color:rgba(255,255,255,0)">Sean recommended a DIN 477 connector, is there a difference (DIN 300 vs. DIN 477)?</span></div><div><span style="background-color:rgba(255,255,255,0)"><br></span></div><div>Lastly, I would like to regulate the air pressure to something more reasonable like 100 or so PSI. Can you recommend an air pressure regulator?</div><br><div>Regards,</div><div><br></div>Mark Widman<div><a href="tel:910-638-5229" target="_blank" value="+19106385229">910-638-5229</a></div><div><div><br></div><div>Sent from
iPhone.</div></div></div><div><br>On Oct 12, 2016, at 10:27 PM, Stephen Fordyce via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Hi Mark,</div><div>I have that sort of thing in my catalogue (TFM Engineering Australia), but being down under, not a lot of point sending them to you in the USA when you get can from the likes of:</div><div><a href="http://www.northshorecompressor.com/products/17B477D22-M-NPT-x-DIN-300-M.html" target="_blank">http://www.northshorecompresso<wbr>r.com/products/17B477D22-M-<wbr>NPT-x-DIN-300-M.html</a><a href="http://www.northeastscubasupply.com/search.php?search_query=DIN+NPT&Search=" target="_blank">http://<wbr>www.northeastscubasupply.com/s<wbr>earch.php?search_query=DIN+NPT<wbr>&Search=</a></div><div><br></div><div>You might be able to do a bit better if you look around - but avoid the ones with bleeders for your application in ca!
se it
gets knocked.</div><div><br></div><div>Cheers</div><div>Steve</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 13, 2016 at 6:44 AM, Mark via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>></span> wrote:<br><blockquote class="gmail_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 dir="auto"><div>Hi Sean,</div><div><br></div><div>I have four SCUBA tanks mounted on the outside of the sub. The SCUBA tanks are used to provide/control air for the external ballast tanks. The air line runs from the SCUBA tank to a thru hull fitting in the sub (to a control valve) and then back out to the ballast tanks. I need to acquire a connector from the SCUBA DIN to either NPT or JIC.</div><div><br></div><div>If I can order a DIN 477 to NPT that would suffice.<br><br><div><div>Regards,</div><div><br></div>Mark Widman<div><a href="tel:910-638-5229" target="_blank" value="+19106385229">910-638-5229</a></div><div><div><br></div><div>Sent from iPhone.</div></div></div></div><div><div class="m_5245259342992521832m_8870378515907829364h5"><div><br>On Oct 12, 2016, at 3:15 PM, Sean T. Stevenson via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> wrote:<br><br></div><blockquote type="cite"><div><p dir="ltr">That's an oddball to find as a single piece, but you can certainly find male DIN 477 to e.g. NPT, and adapt that to a NPT/JIC.</p>
<p dir="ltr">What are you building?</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On October 12, 2016 12:49:50 PM MDT, Mark via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.o<wbr>rg</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
<pre class="m_5245259342992521832m_8870378515907829364m_-1558681103822753051k9mail">Good afternoon, Psubs team:<br><br>Do you know if and where I could purchase a SCUBA tank DIN to JIC connector? <br><br>Regards,<br><br>Mark...<br><a href="tel:910-638-5229" target="_blank" value="+19106385229">910-638-5229</a><br><br>Sent from iPhone.<br><br><hr><br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.or<wbr>g</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/l<wbr>istinfo.cgi/personal_submersib<wbr>les</a><br></pre></blockquote></div></div></blockquote></div></div><blockquote type="cite"><div><span>______________________________<wbr>_________________</span><span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.or<wbr>g</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/l<wbr>istinfo.cgi/personal_submersib<wbr>les</a></span><br></span></div></blockquote></div><br>______________________________<wbr>_________________<br>
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