[PSUBS-MAILIST] Oil expansion

[Alan via Personal_Submersibles]

Brian,
I have a home made oil compensator on my oil filled motor.
I have only run this set up on a boat so far. Basically it's a top hat diaphragm 
made of silicon & clamped in an Aluminium housing that has fill ports in it.
I am going to use the Parker regulator that Cliff is using successfully for his
air compensation, on my oil compensated sub thrusters. I will be able to dial
in a 5psi over pressure ( which seems to be industry standard) & pressurise
the oil with the air. Any back pressure on surfacing or expansion will vent
out the regulators relief valve, & should only be air because of the amount
of air in the air lines to the thruster.
Without compensation water can come in to the thruster from external pressure
& by being sucked in when the oil cools.
Alan

> On 4/06/2019, at 8:41 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi All,
>                What is everybody doing to allow for expansion and contraction of their oil filled motors?  
> 
> Brian
> 
> 
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