[PSUBS-MAILIST] Yet another compensator method

[James Frankland via Personal_Submersibles]

The air bubble is for a few reasons.

1. To allow easier expansion of the oil if required, even though
its enclosed.
2. Seems impossible to completely eliminate it, so thought id go with it.
3.  Some people said you should have a bubble last time i brought this up!



On Mon, 6 Jul 2020 at 15:16, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Looks good to me, but why have an air bubble? I always tried like crazy to
> eliminate it, since that is what expands or contracts most.
>
> Thanks,
> Alec
>
> On Mon, Jul 6, 2020 at 10:00 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> James, that looks great-the air bubble is good also.
>> Hank
>>
>> On Monday, July 6, 2020, 7:31:46 AM MDT, James Frankland via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi All
>>
>> Getting Jodie B ready for diving in the next week or so.
>> I have changed the motor compensator yet again as the last enclosed one
>> didnt really have a proper flexible part and I think the oil expanded a bit
>> over time and leaked out through the seals.  Just a tiny bit, but enough to
>> put some air back in the pipe.
>>
>> Anyway, the new method is simply a tube with belows.  These are from a
>> toilet flush and have been sitting full of oil for a couple of weeks to see
>> if anything happens.  They seem good, so i have installed them. The motor
>> is completely filled with oil and the bellows have a small amount of air.
>> They compress easily, so should provide pressure compensation while also
>> allowing the oil to expand if required.
>>
>> The bellows will be covered with an open ended tube for protection.  Just
>> got to make a strap for those.
>>
>> Any comments?
>> Thanks
>> James
>>
>> [image: 20200704_142240.jpg]
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