<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I am not sure Brian.</div><div>I am thinking that a balanced mechanical seal would be necessary if I went</div><div>with a mechanical seal. Even though the motor is compensated it would</div><div>have more pressure pushing the faces together at depth. </div><div>Every ROV & submarine thruster seems to have a different seal.</div><div>I might try & contact this submersible pump manufacturer & see what they use.</div><div><a href="https://www.flowserve.com/sites/default/files/2016-07/fpd-1362-ea4.pdf">https://www.flowserve.com/sites/default/files/2016-07/fpd-1362-ea4.pdf</a></div><div>They have been in the business of manufacturing submersible pumps for 50</div><div>years.</div><div>Their headquarters are in Hamburg. Carsten, if you know them I am wanting advice</div><div>for a mechanical seal for a pressure compensated thruster with a 10mm shaft </div><div>rotating at 1500 rpm when under load.</div><div>Thanks</div><div>Regards Alan</div><div><br></div><div><br>Sent from my iPad</div><div><br>On 4/10/2016, at 2:38 pm, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family:Arial, sans-serif; font-size:10pt;"><div>I thought the ceramic seals were the way to go on those motors.</div><div> </div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk 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] Brushless Thruster<br>Date: Mon, 3 Oct 2016 22:44:10 +0000 (UTC)<br><br></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><div><span>Alan,</span></div><div dir="ltr"><span>You are right, the mechanical seal is the easiest way to go. My Perry thrusters had simple spring loaded seals with a sealed cavity behind the mechanical seal. You will be oil </span>filled, so the seal will have the back up oil.</div><div dir="ltr">Hank</div> <div><br><br></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Monday, October 3, 2016 1:27 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div><div><div><div>Hank,</div><div>yes I like the idea of going straight to the penetrator with the clear tube attaching</div><div>on to a barbed fitting. I want to put a 4psi overpressure in the system & are</div><div>intending to do this with compressed air; so need to tee in an air line. I also</div><div>need an oil filling point, however the air connection point could double for this.</div><div>I like the clear tube as it is a visual indication of the oil level.</div><div>I have 2 lip seals at the moment. Hugh wasn't too impressed with that idea</div><div>& thought I should go with a mechanical seal. From what I have read, the shaft</div><div>the lip seal runs on needs to be plunge ground to a certain finish, & a mechanical</div><div>seal would eliminate that precision process.</div><div>Also I look at what other large manufacturers have done & figure they have</div><div>done the research on seals & have the experience.</div><div>Cheers Alan</div><div><br>Sent from my iPad</div><div><div><br>On 4/10/2016, at 12:37 am, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><div><span>Alan,</span></div><div><span>You can make up a pretty simple penetrator for the wires, or why not leave the wires the way they are in the clear tube and run the tube to a penetrator on the sub that is made from a barbed fitting. The clear tube can be oil filled and act as your compensator. I know you already though of this. I think the DW's work like that.</span></div><div>If you are oil filled, why the mechanical seal. Just go with a higher pressure rated lip seal.</div><div>Hank</div> <div><br><br></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Monday, October 3, 2016 3:40 AM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div><div><div><div>Hi Hank, thanks.</div><div>yes am intending on getting that type of seal, but I will try & get some advice</div><div>on an appropriate seal for the viscosity & type of oil I am using (Morlina S2 Bl 10).</div><div>Must be a bit barmy because I was getting quite excited about the new </div><div>compensating oil I bought. </div><div>I haven't quite decided how I am going to terminate the wires coming out of the </div><div>motor. At present I have the wires running through a clear hose up to a manifold.</div><div>I say manifold but it is a modified brass T plumbing fitting. The hose is hose clamped</div><div>to one end & the wires are silicone sealed coming out the other end. On the T I have</div><div>a plug that I can remove to fill the tube & thruster with oil. This is okay for experimental</div><div>purposes but will need to add pressure to the system & a through hull fitting</div><div>when I mount it on the sub.</div><div>Alan</div><div><br><br>Sent from my iPad</div><div><div><br>On 3/10/2016, at 9:28 pm, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><div><span>Alan,</span></div><div dir="ltr"><span>That is great! well done.. What type of mechanical seal will you use? Are you planning a spring loaded pump seal? </span></div><div dir="ltr"><span>Hank </span></div> <div><br><br></div><div style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Monday, October 3, 2016 2:07 AM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div>Just did a pool test of my latest brushless thruster.<br>This thruster uses a 60kv (revs per Volt) 6374 (dimensions in mm) brushless<br>sensored outrunner motor. The propeller was a 3 bladed 7&1/4" x 4" with no kort nozzle.<br>I was getting 30kg (66lb) thrust from 30 amps off 52 volts (1560W) with the thruster<br>oil filled. This seems comparable to what Cliff was getting from his Minnkota 101.<br>The difference is this is a much smaller unit. I have been keeping a file on<br>performance statistics of commercial thrusters & trolling motors & this is slightly <br>above average.<br>The manufacturer told me not to run the motor more than 40 amps continuosly,<br>so I am being conservative with the 30 amp draw. I could bump it up by putting<br>on a bigger prop.<br>Next step is to use it as a boat motor & notch up 100 or so hours, then build<br>another housing with a mechanical seal.<br>Added a couple of photos to the project page, but they loaded upside down for<br>some reason. Couldn't change them. <br> <a href="http://www.psubs.org/projects/1235435392/brushlessthruster/">http://www.psubs.org/projects/1235435392/brushlessthruster/</a><br>Alan<br><br>Sent from my iPad<br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></div></blockquote></div><blockquote><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></div></div><br><div>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><br><br></div> </div> </div> </div></div></div></blockquote></div><blockquote><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></div></div><br><div>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><br><br></div> </div> </div> </div></div>_______________________________________________
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