[PSUBS-MAILIST] Oil Compensator

[Alan via Personal_Submersibles]

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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