[PSUBS-MAILIST] Lip seal

Wed May 20 19:25:38 EDT 2015

Alan,
The compensation bladder (hose) will squeeze and force the wedge tight or rather keep it the same as the water pressure.  The spring is still creating the seal.  Inside and outside are the same as if it were not even under water.  I think :-)
Hank--------------------------------------------
On Wed, 5/20/15, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Lip seal
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Wednesday, May 20, 2015, 5:49 PM

 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 thelips
 mating surface, from one direction & water from the
 other. Eventuallythe
 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  willmaintain
 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
 everylast 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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