[PSUBS-MAILIST] Oil Compensator

Alan via Personal_Submersibles personal_submersibles at psubs.org
Tue Feb 21 14:44:21 EST 2017


Brian,
that would defeat the purpose of this style of compensator,
which is designed to use the spring to give an internal overpressure on the motor seals.
You may as well just have a bladder or a 2nd stage regulator with
oil in the line.
Alan

Sent from my iPad

> On 22/02/2017, at 6:38 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,   if you had a hose running down and then up above the level of the container no fluid could escape.
>  
> Brian
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Oil Compensator
> Date: Wed, 22 Feb 2017 05:30:09 +1300
> 
> Hi Brian.
> The oil would fall out when you surfaced apart from anything else.
> There are a lot of different rolling diaphragms out there.
> If you do an image search on rolling diaphragm neoprene fibre reinforced;
> you will see some of the options. The proffesional units that I have found
> information on, are fibre reinforced neoprene. A boot might do!
> For sizing you would double the volume of the diaphragm to get how
> much oil it would displace through it's full range.
> Looking again at the design; you could buy a diaphragm with a hole in the
> centre &, using a threaded rod, clamp a washer either side with nuts as long
> as it didn't leak at that point.
> The switch is optional, as the rod serves as a level indicator if you mark it.
> Alan
> 
> 
> Sent from my iPad
> 
> On 22/02/2017, at 3:38 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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?
>  
> Brian
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] Oil Compensator
> Date: Tue, 21 Feb 2017 10:07:32 +0000 (UTC)
> 
> Hi Psubbers,
> Hank got me thinking when he built his compensator from a pneumatic cylinder.
>    Attached is a design based on how I think the commercial compensators work.
> It seems a great project for a 3D printer.
> The size for a 300ml version would be roughly 10" x 6" (250mm x 150mm) excluding
> the rod. The 10" height would be in 2 sections with the tallest being 6" (thinking of printing height)
>    The rolling diaphragm has a flange that is clamped between the two haves of the body
> & rolls down inside itself as the oil is depleted & it is a mirror image of it's full state.
> It will hit the micro switch to trigger a low oil warning. Also the rod will retract giving an
> external oil level indication.
>    Commercial compensators offer pressure ranges above ambient; for instance 4-8psi.
> This is because the spring has more power in it's compressed state than extended state.
> I think the final design will be dictated by suitable 316 stainless springs & available
> sizes of rolling diaphragms. Haven't found any diaphragms locally but there are heaps
> in China.
> Alan
> 
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