[PSUBS-MAILIST] Lip seal

[Alec Smyth via Personal_Submersibles]

Alan, if the interior of the motor is in-compressible (as in liquid filled)
there is no pressure differential. It's only the pressure *differential*
that counts. There is no push from either side, and you could go to any
pressure you like without the seal lifting.

Best,

Alec

On Wed, May 20, 2015 at 5:49 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> While on the motor subject; a simple low pressure lip seal as below
> (substitute air side with water side)
> will be pressure compensated in a compensated motor! Is this correct?
> In oil compensation there will be oil pushing on the wedged shape of the
> lips mating surface, from one direction & water from the other. Eventually
> the pressure from both sides would lift the seal against it's spring
> pressure,
> but because of the recess above the spring that the oil gets in to, it
>  will
> maintain the same pressure above ambient on the shaft throughout the depth
> changes.
> Alan
>
>
>   ------------------------------
>  *From:* Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Thursday, May 21, 2015 9:17 AM
> *Subject:* Re: [PSUBS-MAILIST] MK101 oil compensation tap
>
> Cliff,
> how are you compensating for oil expansion due to heat with the KISS
> method.
> Are you just drilling holes in the housing & using tube?
> Alan
>
>
>
> ------------------------------
>  *From:* Clifford Redus via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Thursday, May 21, 2015 8:43 AM
> *Subject:* Re: [PSUBS-MAILIST] MK101 oil compensation tap
>
> Actually in the spirit of KISS, I am going to start out using oil pressure
> compensation.  If I run into any issues, I will look at using the air or
> this hybrid of oil and air with a regulator.
>
>
> Cliff Redus
>
>
>
> On May 20, 2015, at 2:30 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Jon,
> the alternative is to follow Hugh's idea that Cliff is using & I am going
> to test out,
> & put a regulator in the system that is set it to around 4psi internal
> overpressure.
> This means you can fill with oil & not worry about getting every
> last drop going in, or drilling the housing. You will also be able to run
> it air compensated.
> There is the safety feature that if you leak oil there is plenty of air to
> replace it.
> Cliff already has the parts sorted, just put your order in:)
> Alan
>
>   ------------------------------
>  *From:* Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Thursday, May 21, 2015 5:47 AM
> *Subject:* Re: [PSUBS-MAILIST] MK101 oil compensation tap
>
>
> How important is it to get every last air bubble out?  Surely a fraction
> of the total volume is not going to result in catastrophic failure of
> the motor housing, is it?
>
>
>
>
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