[PSUBS-MAILIST] Lip seal

Wed May 20 19:21:49 EDT 2015

 Alan, if I understand you, I think you have this backward for oil compensation.  The area on the figure that says front chamfer should be facing the sea water so that a higher external pressure causes the area around the garter spring to compress.  When oil in the motor expands due to temperature, it is vented to the flexible bladder and not out past the lips seal.  If bladder is soft, then the pressure inside the motor should be approximately the same as the ambient water pressure regardless of depth.
For air compensation in which your regulator is set say 4 psi above ambient water pressure, then you would want to reverse the orientation of the lip seals so the higher internal pressure tends to tighten the seal.
The lip seals on the MK101 come with the front chamfer faces the sea water.
Got to run.  
Cliff

       From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, May 20, 2015 4:49 PM
 Subject: Re: [PSUBS-MAILIST] Lip seal

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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