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Thread: 3yr old SS pump motor corroded AGAIN

  1. #16

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    Quote Originally Posted by ballvalve View Post
    Now I am confused. In electrical you show us the pump HEAD looking shiny and brand new!

    If that is the one from the well, you strictly have an ELECTRICAL corrosion issue.

    What is the pump head condition from the ugly motor?
    Yes, that's the same pump that came off of both motors and still looks nice and shiny, no signs of corrosion.

  2. #17
    In the trades WellWaterProducts's Avatar
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    So we agree it's not chemical corrosion.

    Things to consider

    Is the electrical system properly grounded?
    Is the contactor for the motor 2-pole?
    Have you got a lightning arrestor properly installed? http://www.deltala.com/ and http://www.franklin-electric.com/fra...il-part-1.aspx
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    h2oguy.com




  3. #18
    General Engineering Contractor ballvalve's Avatar
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    If they have not told you in electrical, I would install a so called equipotential grounding grid at the well head, or at least some ground rods, which you can lay horizontally in a 1 or 2' deep trench, and bond your ground wire from the pump to it correctly.

    Check your incoming and running voltage also at the pump.

  4. #19
    Jack of all trades DonL's Avatar
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    Hello Group,

    Nothing like good old steal pipes as a well casing, Getting a Ground is not a problem.
    PVC just don't work with lightning strikes. A lightning protector may be the answer, For a PVC pipe.
    You still need a good Ground for the power dissipation, when you get a strike.

    DonL
    Last edited by DonL; 04-14-2011 at 11:41 AM. Reason: Operator Error

  5. #20
    Moderator valveman's Avatar
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    Lightning usually makes a hole in the top of the windings, not the bottom. This is not always true but a hole by the thrust bearing is usually not from lightning. I am also guessing a ground current issue. I have seen where the water heater was not wired properly and caused this kind of damage to the pump/motor. Ground currents are hard to find, might just want to add some more grounds to everything.

  6. #21

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    Quote Originally Posted by valveman View Post
    might just want to add some more grounds to everything.
    How do you mean?

  7. #22
    Moderator valveman's Avatar
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    Check or redo the grounds to the breaker box, water heater, AC, and anything else electrical.

  8. #23
    General Engineering Contractor ballvalve's Avatar
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    http://en.wikipedia.org/wiki/Multipoint_ground

    http://www.erico.com/public/library/fep/LT1242.pdf

    Run a ground wire pump to your panel and be sure all is bonded correctly. Also make sure the NEUTRAL is properly connected in your panels, which is much more important than the grounds.

    A ground grid at the well head might take care of stray current from the PO CO. -Bonded to the well pump and the panel.
    Last edited by ballvalve; 04-16-2011 at 10:26 AM.

  9. #24
    In the trades WellWaterProducts's Avatar
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    Not the link I posted above as well

    "In order for a surge arrestor to be effective, it must be grounded to the water strata. Water strata is the actual water underground. Any surge in the system is looking for the easiest path to true water ground. The faster this surge is directed to ground, the less damage it can cause to your system. Grounding the arrestor to only a driven ground rod may not be an adequate ground as the resistance through the soil is higher in some areas than others. Higher resistance means the surge will look for an easier path to ground, which may be through your motor. Connecting the ground wire from the arrestor directly to the motor is the best ground available. A ground wire from the motor has been a US National Electrical Code (NEC) requirement since 1990, so the wire should be readily available. Other potential ground sources are metal well casings and metal drop pipes that are in direct contact with the well water. However, not all wells are cased all the way to the water, such as a rock well. In some situations, a metal well casing or drop pipe may be adequate ground for a surge arrestor, but a motor that is not grounded to the metal casing and the service entrance does not meet 1990 and 1993 NEC requirements."
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    Chris Kofer
    h2oguy.com




  10. #25
    DIY Senior Member Smooky's Avatar
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    Some of the damage looks like it may be from the pump rubbing against the rock. You could set the pump at a depth that is above where the rock starts if you know the depth of the PVC casing. Also if the water is very soft, this causes it to be corrosive. If you can protect the pump from rubbing it may keep it from corroding so quickly. Get good quality stainless for hardware. I always check it with a magnet to make sure it is truly stainless. Sometimes boat hardware is a better quality stainless.

  11. #26
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by Smooky View Post
    Some of the damage looks like it may be from the pump rubbing against the rock...
    We were told that the pump is(was) in the PVC casing, not in rock.

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