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Thread: 3yr old SS pump motor corroded AGAIN

  1. #1

    Default 3yr old SS pump motor corroded AGAIN

    Some of you may remember that 3yrs ago I pulled my 3-year-old Franklin 4" submersible pump out of the ground and found that the stainless case was eaten away like a battery anode.

    http://www.terrylove.com/forums/show...y-it-seized-up

    I replaced it with a same-sized Grundfos (I actually bought it from speed_bump here on the board). Wouldn't you know it; I turned it on for the first time this spring and no water. I eventually pulled it out and it is also corroded away. I still have to clean off the black sulfur gunk off it, but here are the pics I took:


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    I'm not sure how the thing even worked up until the end of last season, but the biggest question is:

    HOW DO I KEEP THIS FROM HAPPENING AGAIN??

    I enjoy do-it-yourself projects. I enjoy saving money. I enjoy working outdoors and building things. But I don't EVER want to see the inside of this well again in my life.

    Can anybody tell me why this is happening and how to stop it??
    Last edited by Terry; 04-12-2011 at 10:47 AM.

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    My guess is there are ground loop currents causing the corrosion. Is the pump in a metal well casing or in a rock bore? Is the casing grounded? Describe the service feed and grounding. How far from the transformer on the pole to the service entrance? what gauge of wire feeding to the main panel?

  3. #3
    DIY Senior Member thassler's Avatar
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    Happened upon this on google. A little light reading about corrosion:
    http://www.groundh2o.org/standards/article_510.pdf
    TreyH
    ** Not a professional - only a DIYr **

  4. #4

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    Quote Originally Posted by LLigetfa View Post
    My guess is there are ground loop currents causing the corrosion. Is the pump in a metal well casing or in a rock bore? Is the casing grounded? Describe the service feed and grounding. How far from the transformer on the pole to the service entrance? what gauge of wire feeding to the main panel?
    The well casing is PVC and as such is not grounded.

    I'm not sure how to descibe the service feed. The wiring is all underground. There are no transformers on poles around here. There a couple of big boxes on the ground near the street (and close to my well) but I dont' know if they are for electrical or communications. They are about 100ft from my electrical panel.

    As far as gauge of wire feeding into the panel in the basement, I would have to measure it I guess but it's BIG. Like ~1/2" diameter if I remember correctly. I have a 200A panel.

    I can take pictures of things if it would help. Just LMK what you want to see.

  5. #5
    General Engineering Contractor ballvalve's Avatar
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    The hole might be a lightening strike. Must be stray current. Is this a 2 wire or three wire pump and is there a ground wire? What voltage? What is your waters PH?

    You might want to move this over to electrical also.

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
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    The pitting and the downward flowing stain under the pits suggest that there may be electron flow. The hole at the bottom looks like it could be lightning damage.

    Is there a clorine treatment system on this well?

  7. #7

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    Quote Originally Posted by ballvalve View Post
    The hole might be a lightening strike. Must be stray current. Is this a 2 wire or three wire pump and is there a ground wire? What voltage? What is your waters PH?

    You might want to move this over to electrical also.
    This is a 2-wire pump, 240V. There are 3 wires total which I believe 2 are hot and the 3rd is return? I will check in the box when I get home tonight or tomorrow to make sure I'm not telling a lie.

    I had the water tested 3yrs ago and it was 7.3. That was not water that was pumped out; that was taken just from the top of the water table.

    There is definitely lots of sulfur in the water; you can smell it when the sprinklers come on and it leaves a residue on everything after a while.
    Quote Originally Posted by LLigetfa View Post
    The pitting and the downward flowing stain under the pits suggest that there may be electron flow. The hole at the bottom looks like it could be lightning damage.

    Is there a clorine treatment system on this well?
    No chlorine treatment. This well is connected directly to a lawn irrigation system. Not used for drinking or anything else.

  8. #8
    In the trades WellWaterProducts's Avatar
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    How is the pump cycling. I've seen abrasion on pump motors as well.
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  9. #9

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    Quote Originally Posted by WellWaterProducts View Post
    How is the pump cycling. I've seen abrasion on pump motors as well.
    The pump feeds sprinklers (~13 zones) that run every 2-6 days depending on the weather.

    The pump does not feed a storage tank or anything else. Just the sprinklers.

    Also keep in mind the well case is PVC.

    Does that answer your question?

  10. #10
    In the trades WellWaterProducts's Avatar
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    No pressure switch then? What starts the pump?
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  11. #11

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    No pressure switch.

  12. #12
    In the trades WellWaterProducts's Avatar
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    Is it possible that no water is flowing past the motor?
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  13. #13

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    Quote Originally Posted by WellWaterProducts View Post
    Is it possible that no water is flowing past the motor?
    I guess it's possible. The well always produced very well up to when I shut it off last fall.

  14. #14
    General Engineering Contractor ballvalve's Avatar
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    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?
    Last edited by ballvalve; 04-13-2011 at 11:09 AM.

  15. #15
    Jack of all trades DonL's Avatar
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    Hello Group,

    And I agree with BallValve "The hole might be a lightening strike" , That is if you did not make the Hole, Too take a look See.

    The Hole Does not even look Corroded, That much. If it was a lightening strike, I would think that the wire would be discolored also.

    DonL

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