Corrosion

Discussion in 'Water Heaters and Softeners' started by jmcintyre99, Sep 7, 2018.

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  1. Sep 7, 2018 #1

    jmcintyre99

    jmcintyre99

    jmcintyre99

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    Have an issue maybe some one can help with this is on water heaters in a hotel we did a couple years ago replace the nipples and dielectric unions about 9 months ago due to the same problem now it is this bad again and needs to be replaced again. Thought was due to electrolysis but all have been grounded in multiple places now and still same issue
    upload_2018-9-7_16-2-26.jpeg
     
  2. Sep 7, 2018 #2

    jmcintyre99

    jmcintyre99

    jmcintyre99

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    upload_2018-9-7_16-6-54.jpeg Another pic
     
  3. Sep 7, 2018 #3

    Geofd

    Geofd

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    you have a copper clamp on a galvi pipe the dielectric union is stopping electrolysis between the galvi pipe and the copper pipe my ground clamp is on the copper water main...
     
  4. Sep 8, 2018 #4

    jmcintyre99

    jmcintyre99

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    There are ground on the copper also just not shown in pic
     
  5. Sep 8, 2018 #5

    jmcintyre99

    jmcintyre99

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    Building is all sch80 cpvc only copper at water heaters
     
  6. Sep 8, 2018 #6

    Geofd

    Geofd

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    you still have 2 dissimilar metals touching...that causes electrolysis the copper and galvi cant touch each other
    not sure if im describing it correctly but I think that the metals touching each other causes some kind of electrical current
     
  7. Sep 8, 2018 #7

    voletl

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    Grounding has nothing to do with electrolysis. Also why did you replace the nipples with galvanized? Why not brass?
     
    TomFOhio likes this.
  8. Sep 8, 2018 #8

    jmcintyre99

    jmcintyre99

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    The two metals don’t touch hence the dielectric union
    Brass is a nonferrous metal also just like copper and the tank of the heater is steel (ferrous metal).
    But that was the thinking so far as to replace with brass this time.
    I have just never seen any other ones this bad and reoccurring.
     

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