[PSUBS-MAILIST] Lip seal

Thu May 21 08:21:05 EDT 2015

Alan,
Sorry I repeated what you said, ok I am awake now :-)
Hank--------------------------------------------
On Thu, 5/21/15, hank pronk 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: Thursday, May 21, 2015, 8:17 AM

 Alan,
 Your forgetting the spring, that is what is
 doing the work because the pressure is the same on both
 sides including the areas above and in front of the v
 area.  The area above the V does provide pressure on the
 shaft IF there is a pressure differential with the higher
 pressure being above the V.
 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, 10:32 PM

  Alec is

 kind of understanding me.On the
  microscopic
 level, at the very point of the V where it

 touches the propeller shaft,there must
  be a
 slight lifting with increased pressure from depth, due
  to pressure from water & oil
  from oposing sides pushing on the V of the
 seal &
  squeezing it up. This lifting
 will occur untill the
  oil & water
 actually meet.This may
  cause mixing of the
 two with the shafts rotational

 speed. However I
  am assuming that with
 this simple type of rotary shaft seal,
  the
 oil pressure (or water depending on the seal
  orientation) which
  would be
 in the cavity above the spring, would counteract
  this, leaving a consistant pressure on
 the shaft
  regardless of depth.Alan

   From: Alec
 Smyth via
  Personal_Submersibles
  <personal_submersibles at psubs.org>

  To: Personal
  Submersibles General Discussion
  <personal_submersibles at psubs.org>

  Sent:

 Thursday, May 21, 2015 11:27 AM
   Subject:
 Re:
  [PSUBS-MAILIST] Lip seal

  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
  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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