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<div>Alan,</div><div>I assumed that the air pressure at the out port of the regulator is 4 psi above ambient. My concern is,, will the .125 air line supply air fast enough at 4psi to maintain 4psi above ambient inside the actuator. </div><div>Hank</div><div><br></div>
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On Friday, December 8, 2017, 10:01:31 PM MST, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv3607278378"><div><div>Hank,</div><div id="yiv3607278378AppleMailSignature">you will have the internal space of your actuator to equalise, which</div><div id="yiv3607278378AppleMailSignature">shouldn't be a problem as this will be slowly equalised as you descend.</div><div id="yiv3607278378AppleMailSignature">Then you have the piston going out during manipulator use, & there will be air going</div><div id="yiv3607278378AppleMailSignature">in to fill that void. If you are running either off a 1st stage regulator or a relieving</div><div id="yiv3607278378AppleMailSignature">regulator like Cliff's, the air will be kept at ambient & it will only be that small</div><div id="yiv3607278378AppleMailSignature">flow in to the space the piston has vacated. </div><div id="yiv3607278378AppleMailSignature">You could estimate the internal volume change by using an on line cylinder volume calculator & plugging in the piston diameter & the difference in length it changes </div><div id="yiv3607278378AppleMailSignature">as it protrudes.</div><div id="yiv3607278378AppleMailSignature">If the actuators full stroke takes (as an example) 4 seconds at full speed, &</div><div id="yiv3607278378AppleMailSignature">the volume is 100ml, you could then run air through your intended hose at your supply pressure (130 psi for scuba regulator) in to a small crushed plastic bag, & see if it can</div><div id="yiv3607278378AppleMailSignature">at least fill the bag with 100ml of air in 4 seconds. </div><div id="yiv3607278378AppleMailSignature">Have done similar for rough estimates.</div><div id="yiv3607278378AppleMailSignature">Or just blow through the hose in to a plastic bag ( like lots of people do at Christmas</div><div id="yiv3607278378AppleMailSignature">time) & you might think yep this will do with 130psi behind it.</div><div id="yiv3607278378AppleMailSignature">BTW on A relieving regulator the orifice is pretty small & in Cliff's case it is venting</div><div id="yiv3607278378AppleMailSignature">the internal volume of his 4 thrusters in the last 30ft of ascent.</div><div id="yiv3607278378AppleMailSignature">Cheers Alan</div><div id="yiv3607278378AppleMailSignature"><br clear="none">Sent from my iPad</div><div class="yiv3607278378yqt2247838029" id="yiv3607278378yqt66597"><div><br clear="none">On 9/12/2017, at 4:37 PM, 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>Hi All,</div><div>I am new to air compensating so I need to know if the air line size to each of my actuators is critical. To save money I want to recycle the high pressure nylon tubing that is used for hydraulic lines on my hydraulic arm. The nylon air lines are a bit over .125 ID</div><div>thanks'</div><div>Hank </div></div></div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div><div class="yqt2247838029" id="yqt64733">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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