[PSUBS-MAILIST] motor seal

[hank pronk via Personal_Submersibles]

Sean,Sorry I should have said the seal is in the pump motor.  I took an oil filled submersible pump  motor apart and the seal is in opposite to the Minn Kota.  The seal is keeping oil in rather than keeping water out.  Maybe it is because the armature spinning raises internal pressure.Hank 

    On Wednesday, December 14, 2016 6:53 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 The submersible pump develops an internal pressure equal to the discharge head which must be resisted by the seal. With a lip seal, you have a base resistance due to compression of the elastomer or energizing spring, but then any additional pressure will tend to either load or unload the seal depending on its installation direction. Lip seals with low or zero differential pressure rating may still have a preferred installation direction, depending on whether retaining fluid or excluding contaminants is the greater priority. If you are sealing a pressure differential, you want the lip oriented toward the higher pressure side, so that it is energized by that pressure. If you are sealing equal pressures, than the direction is up to you, but if sealing seawater on one side, orienting the lip in that direction stands a better chance of excluding it, provided you don't have any pressure increase on the inside.  With the dual seal arrangem! ent,inner seal faces in, outer seal faces out.Sean


On December 14, 2016 6:16:28 AM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi All,I took a submersible pump apart to find that it has one seal and it is backwards compared to the Minn Kota.  Maybe the trick is to reverse the seal when the motor is oil filled.Alec, is that what you did, I remember you and Cliff talking about that.Hank
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