[PSUBS-MAILIST] Thruster bladders

[Rick Patton via Personal_Submersibles]

Hi Alan,
You mentioned oil being flung up the feed tube and that it is clear and
gives you an idea of the oil level. I am confused on how you have your feed
tube set up? Does it come out of the top and back into the bottom of the
can or is there only one hole in the can with a clear tube coming out a
foot or so with a plug on the end and there must me air in the plastic tube
to be able to give you an oil level and I didn't think you were supposed to
have any air in the system at all?
Rick

On Tue, Sep 14, 2021 at 6:35 PM Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Rick,
> I am pressurising the oil in my thrusters with air at 5psi above ambient.
> Have found that without a bit of pressure the oil gets flung out of the
> motor housing & up the feed tube.
> The feed tube to the thruster is clear & gives me an indication of the oil
> level.
> I have spent a lot of time on the compensator issue, even 3d printing one
> & using a second stage regulator.
> I am currently ordering a stainless 316 pressure regulator with a 0-25psi
> output range and a stainless brewers over-pressure valve set at between
> 6-8psi. This is similar to what Brian Hughes is doing & a modification on
> what Cliff was using. Cliffs relieving type regulator couldn't cope with
> the back pressure build up.
> One advantage of going this route is that if you want to copy the Psubs
> electric manipulator (am working on my own version) you need to air
> compensate it & you can do both off this same unit.
> I am running a hose from the regulator to a manifold, from which hoses
> will go to 4 thrusters, the electric manipulator and over-pressure valve.
> Let me know if I can help.
> Alan
>
>
>
> On Wednesday, September 15, 2021, 04:14:32 PM GMT+12, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> I am re thinking what to use for my oil expansion bladder. Would love to
> hear from everyone who chose to go with an oil filled thrusters on what
> they used and how they liked it. I remember someone saying that they used a
> squeeze ball gas tank primer which I like because it is small but I just
> spoke with someone who didn’t use a bladder and had never had a problem.
> Rick
>
> Sent from my iPhone
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