[PSUBS-MAILIST] Oil Compensator

[Alan via Personal_Submersibles]

Jon,
Glad you found a solution.
I can't see any reason that you cannot use air compensation to
pressurise an oil filled motor! You can have the choice of having
air or filling with oil if you go with air compensation.
I haven't thought through the situation where you could break off
a fitting etc & drain a scuba tank of air. You would need to be sure
that in the event of failure you could blow your ballasts. Wonder
what Greg does!
   If you use Hugh / Cliff's regulator you have the option of dialling
in an overpressure, however I am not sure at what pressure the 
relieving valve operates on that regulator. It would be dictated by 
the relieving spring in the handle, & could be replaced with a 
different strength spring.
Alan


Sent from my iPad

> On 15/04/2017, at 11:36 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Looks like I have found an easier solution.  Rather than finding a hose to fit over the shaft/motor coupler I can use 3/4 PVC sched-40 or a 1 inch plastic pipe barb fitting to fit inside the shaft/motor coupler.  That gives me a short fitting to attach the air compensation hose to and it's smaller diameter so will be easier to find tubing or hose to fit it.
> 
> With that, I think at this point I'm going to choose air compensation.  While it requires more equipment and a potential octopus of tubing to retrofit it to the K-600, it has some very good advantages when it comes to easy-access to the motor when maintenance is required in the future.
> 
> However, I reserve the right to change my mind.  :)
> 
> Jon
> 
> 
>> On 4/13/2017 9:32 PM, Alan via Personal_Submersibles wrote:
>> Jon,
>> an easy solution is to take the thruster, or that section of the thruster
>> in to a plumbing merchant or hydraulic repair shop & ask for something 
>> compatible with a barbed hose fitting. Sometimes a metric option will
>> fit in an imperial thread, & so they may know of not so obvious solutions.
>> Alan
> 
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