<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Right, on my motor pods I have O rings on the end caps, I'm a bit concerned if I have any excess pressure I may leak oil , so in my case I'm trying to stay as neutral as possible.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] Oil Compensator<BR>Date: Wed, 22 Feb 2017 08:44:21 +1300<BR><BR></DIV><DIV>Brian,</DIV><DIV>that would defeat the purpose of this style of compensator,</DIV><DIV>which is designed to use the spring to give an internal overpressure on the motor seals.</DIV><DIV>You may as well just have a bladder or a 2nd stage regulator with</DIV><DIV>oil in the line.</DIV><DIV>Alan<BR><BR>Sent from my iPad</DIV><DIV><BR>On 22/02/2017, at 6:38 AM, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Alan, if you had a hose running down and then up above the level of the container no fluid could escape.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: Alan 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] Oil Compensator<BR>Date: Wed, 22 Feb 2017 05:30:09 +1300<BR><BR></DIV><DIV>Hi Brian.</DIV><DIV>The oil would fall out when you surfaced apart from anything else.</DIV><DIV>There are a lot of different rolling diaphragms out there.</DIV><DIV>If you do an image search on rolling diaphragm neoprene fibre reinforced;</DIV><DIV>you will see some of the options. The proffesional units that I have found</DIV><DIV>information on, are fibre reinforced neoprene. A boot might do!</DIV><DIV>For sizing you would double the volume of the diaphragm to get how</DIV><DIV>much oil it would displace through it's full range.</DIV><DIV>Looking again at the design; you could buy a diaphragm with a hole in the</DIV><DIV>centre &, using a threaded rod, clamp a washer either side with nuts as long</DIV><DIV>as it didn't leak at that point.</DIV><DIV>The switch is optional, as the rod serves as a level indicator if you mark it.</DIV><DIV>Alan</DIV><DIV><BR><BR><DIV>Sent from my iPad</DIV></DIV><DIV><BR>On 22/02/2017, at 3:38 AM, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Alan, What happens if you just have the oil exposed to the water? If you turned the container ( compensator) upside down the oil would rise to the top of the container and would not be able to escape to the ocean. Wonder if that would work?</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: Alan James 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: [PSUBS-MAILIST] Oil Compensator<BR>Date: Tue, 21 Feb 2017 10:07:32 +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: 16px; background-color: rgb(255, 255, 255);"><DIV> Hi Psubbers,</DIV><DIV>Hank got me thinking when he built his compensator from a pneumatic cylinder.</DIV><DIV> Attached is a design based on how I think the commercial compensators work.</DIV><DIV>It seems a great project for a 3D printer. </DIV><DIV>The size for a 300ml version would be roughly 10" x 6" (250mm x 150mm) excluding</DIV><DIV dir="ltr">the rod. The 10" height would be in 2 sections with the tallest being 6" (thinking of printing height)</DIV><DIV dir="ltr"> The rolling diaphragm has a flange that is clamped between the two haves of the body</DIV><DIV dir="ltr">& rolls down inside itself as the oil is depleted & it is a mirror image of it's full state.</DIV><DIV dir="ltr">It will hit the micro switch to trigger a low oil warning. Also the rod will retract giving an</DIV><DIV dir="ltr">external oil level indication. </DIV><DIV dir="ltr"> Commercial compensators offer pressure ranges above ambient; for instance 4-8psi.</DIV><DIV dir="ltr">This is because the spring has more power in it's compressed state than extended state.</DIV><DIV dir="ltr">I think the final design will be dictated by suitable 316 stainless springs & available</DIV><DIV dir="ltr">sizes of rolling diaphragms. Haven't found any diaphragms locally but there are heaps</DIV><DIV dir="ltr">in China.</DIV><DIV dir="ltr">Alan</DIV><DIV dir="ltr"><BR></DIV></DIV>_______________________________________________
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