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<div>Alan,</div><div>I would never connect an air compensating system to my main HP supply. That would be too risky for me. There are times when there is lots going on and a leak could go undetected. I am sure Cliff has bells and whistles to let him know. </div><div>Hank</div><div><br></div>
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On Saturday, September 16, 2017, 2:23:08 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv2930808654"><html><head></head><div><div>Hank,</div><div>I did a lot of initial experimentation with the system Cliff is using.</div><div>I bought 4 relieving regulators & pulled them apart. Unless the </div><div>regulator is fully stainless, you need to change out parts in the</div><div>spindle section. At the time I was looking at $40- plastic "Festo" regulators,</div><div>but couldn't find a suitable replacement spring. Cliff's little regulator</div><div>was going to cost me about NZ $400 & I had wanted one for each</div><div>thruster. </div><div>The system Cliff is using is good in that if you have an oil compensated</div><div>thruster the oil would just be replaced with air if it leaked out.</div><div>He is using his on air compensated motors, so the volume going through</div><div>the regulator, & being relieved, is huge compared with what would flow</div><div>with a air over oil system.</div><div>It's good to bounce this off people. I am thinking I would need a dedicated</div><div>air tank for Cliff's system to be G.L. or ABS compliant. So more volume cost</div><div>& hassle.</div><div>If I had air over oil I could have one regulator & still see if one thruster was </div><div>leaking more than another. If I go with the traditional rolling diaphragm & </div><div>spring type compensator it will be easy for me to put in a low level switch.</div><div>If I went with my weight instead of the spring, then I may add 25lb more</div><div>weight than is necessary.</div><div>Will ponder this some more!</div><div>Cheers Alan</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"><div>Sent from my iPad</div></div><div class="yiv2930808654yqt0405837739" id="yiv2930808654yqt25666"><div><br clear="none">On 17/09/2017, at 6:52 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div><br clear="none"></div><div>Alan,</div><div>I would have to vote for the set up Cliff has unless you are planning to be able to jettison the motors. Oil compensating is so much easier to jettison. I suppose though you could have a HP tank jettison with the motor. </div><div>Hank</div><div><br clear="none"></div>
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On Saturday, September 16, 2017, 12:21:01 PM MDT, Sean T. Stevenson via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div dir="ltr">I wasn't suggesting regulated air compensation, but rather fixed-volume<br clear="none">oil compensation, with regulated air to provide the positive pressure on<br clear="none">the compensator rather than a spring. In that case, a failure of the<br clear="none">air system just leaves you with compensation at ambient pressure.<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><br clear="none">On 2017-09-16 10:06, Alan via Personal_Submersibles wrote:<br clear="none">> Thanks,<br clear="none">> yes if the sub were on an angle the weight could get lodged in position<br clear="none">> temporarily, or lose some of it's force on the rolling diaphragm. <br clear="none">> But in the worst case this would leave the oil compensated at ambient.<br clear="none">> I looked seriously at Hugh / Cliff's system with the regulated air supply<br clear="none">> giving an over-pressure on my oil filled thrusters, but you would probably<br clear="none">> need a dedicated air tank in case of a major leak, or more valves &<br clear="none">> through<br clear="none">> hulls to be able to turn the air off. Also the stainless regulator was<br clear="none">> more than <br clear="none">> what I wanted to pay. <div class="yiv2930808654yqt9339691379" id="yiv2930808654yqtfd02161"><br clear="none">> Cheers Alan<br clear="none">><br clear="none">> Sent from my iPad<br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div></div>
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