<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2" style=""><FONT face="Arial, sans-serif"> Alan, </FONT></FONT><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"> In my case my motor pod contains about 8 gallons of WD40 . I ran the motors the other day , all day long for about 10 hours straight . The temp outside was around 60 F so it sort of simulated our water temperature here. I was surprised to discover that the expansion of the oil was not as much as I thought it would be , it was about 1/2 gallon. It reached a point where it stopped expanding, so I guess it reached a point of equilibrium with respect to the temperature. One problem I have is in the summer the oil actually expands more than when the motor is running just sitting there heating up from the ambient temperature. I think in the summer I'm going to disconnect the hose and put it into a bucket when sitting. </FONT></FONT></DIV><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif">Brian</FONT></FONT></DIV><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"> </FONT></FONT><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">From: Alan via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] motor oil compensator</SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Date: Wed, 25 Mar 2020 13:25:53 +1300</SPAN><BR><BR><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">Brian,</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">there is this military de-classified 1972 document on pressure compensating.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><A href="https://apps.dtic.mil/dtic/tr/fulltext/u2/894795.pdf">https://apps.dtic.mil/dtic/tr/fulltext/u2/894795.pdf</A></DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">I printed it out & had it bound.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">I found that the rotation of the motor was throwing the oil out of the motor</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">housing & up in to the compensating tube. If you dived there would be added</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">pressure to keep the oil in the motor housing, but this wouldn't happen transiting</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">on the surface. As the oil also keeps the Motor cool, there may be a danger of</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">the motor overheating in this instance.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">As you will find in the linked manual, a minimum of 5psi over pressure is the norm.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">I am going to use the same system as Cliff, with the relieving regulator dialled</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">up to 5psi to give an overpressure. However my system has oil in it so I get it's </DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">cooling advantages & eliminate large air volume changes.</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;">Alan</DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><BR>On 25/03/2020, at 11:19 AM, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV><DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2">Seawater gets compressed up the hose, so never goes above the highest point of the hose. When oil heats up it spills into trap and cannot escape to the sea. </FONT><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2">Brian</FONT></DIV><DIV><FONT size="2"><BR></FONT><BR><SPAN style="font-size: 10pt;">--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:</SPAN><BR><BR><SPAN style="font-size: 10pt;">From: Øystein Skarholm via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>></SPAN><BR><SPAN style="font-size: 10pt;">To: Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>></SPAN><BR><SPAN style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] motor oil compensator</SPAN><BR><SPAN style="font-size: 10pt;">Date: Tue, 24 Mar 2020 22:21:15 +0100</SPAN><BR><BR><DIV dir="ltr" style="font-size: 10pt;">You should avoid contact between the seawater and the oil. The oil will contaminate quickly and it will no longer be dielectric. <DIV>Just the hose from the motor to the tee is enough to compensate. You do not have to have a large volume of oil. Fill the hose with oil and cap it off, done. or make a neat yet more sophisticated solution. </DIV><DIV>Make the end lid of the motor as a flange assembly and instead of a lid, use a rubber diaphragm. This will then act as a compensator. You can even install a light spring pushing down on the diaphragm if you want a slight internal overpressure. </DIV><DIV><DIV><image.png><BR></DIV></DIV></DIV><BR><DIV style="font-size: 10pt;"><DIV dir="ltr">tir. 24. mar. 2020 kl. 21:28 skrev Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>>:<BR></DIV><BLOCKQUOTE style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><DIV style="font-family:Arial,sans-serif;font-size:10pt"><FONT size="2">Here is a drawing for my oil compensator</FONT><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV></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>
</BLOCKQUOTE></DIV><BR><DIV style="font-size: 10pt;"><BR></DIV><SPAN style="font-size: 10pt;">-- </SPAN><BR><DIV dir="ltr" style="font-size: 10pt;"><DIV dir="ltr"><DIV>Vennlig hilsen<BR>Øystein Skarholm</DIV><DIV>91369599</DIV></DIV></DIV><SPAN style="font-size: 10pt;">
--000000000000a6cb3105a1a055ba--_______________________________________________
Personal_Submersibles mailing list
</SPAN><A style="font-size: 10pt;">Personal_Submersibles@psubs.org</A>
<A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" style="font-size: 10pt;">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
</DIV></DIV></DIV></BLOCKQUOTE><BLOCKQUOTE style="font-family: Arial, sans-serif; font-size: 10pt;"><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><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">_______________________________________________
Personal_Submersibles mailing list
</SPAN><A href="/eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org" style="font-family: Arial, sans-serif; font-size: 10pt;">Personal_Submersibles@psubs.org</A>
<A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" style="font-family: Arial, sans-serif; font-size: 10pt;">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
</DIV></DIV>