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  1. #1
    Join Date
    Mar 2007
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    Oklahoma City
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    Default Chemical reaction?

    Home is only 5 yrs old and neither pipe has been replaced. Why would one be so tarnished and the other not at all?

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  2. #2
    Join Date
    Mar 2007
    Location
    Orlando, FL
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    1,340

    Default Re: Chemical reaction?

    Poorly made flex connector, or no dielectric union/coupler on that piece.


  3. #3
    Join Date
    Mar 2007
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    Oklahoma City
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    Default Re: Chemical reaction?

    There was a DE on that pipe. May not be working, but it was there. Still wondering what else it could be.

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  4. #4
    Join Date
    Mar 2007
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    Orlando, FL
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    Default Re: Chemical reaction?

    Water heater is back-drafting, and sulfur is corroding the copper?


  5. #5
    Join Date
    Aug 2007
    Location
    Memphis TN.
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    4,311

    Default Re: Chemical reaction?

    The Guy who left his Foot Print on the Wall did it.
    .

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  6. #6
    Join Date
    Jul 2009
    Location
    Spokane, WA
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    116

    Default Re: Chemical reaction?

    I'm with Dom. It definitely looks like sulfur corrosion. I would say Chinese drywall but it would likely be on both lines. Check for back drafting in the direction of the line.


  7. #7
    Join Date
    Apr 2008
    Location
    Western Massachusetts
    Posts
    536

    Default Re: Chemical reaction?

    Flue gasses condensing on cold water line?


  8. #8
    Join Date
    Apr 2008
    Location
    Western Massachusetts
    Posts
    536

    Default Re: Chemical reaction?

    Quote Originally Posted by Cishemant Mahajan View Post
    I heard that sodium reacts and catches fire in water, can you tell me the reaction and chemical formula.
    Na2 + H2O -> SpAm


  9. #9
    Join Date
    Oct 2011
    Location
    Minneapolis, MN
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    780

    Default Re: Chemical reaction?

    Seems like an extreme example, but heat can speed up corrosion rates. Is the bad one the hot water?

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  10. #10
    Join Date
    Apr 2008
    Location
    Western Massachusetts
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    536

    Default Re: Chemical reaction?

    Quote Originally Posted by Kristi Silber View Post
    Seems like an extreme example, but heat can speed up corrosion rates. Is the bad one the hot water?
    Heat can speed up corrosion, but the type of corrosion present suggests something else. That's why I suspect it's the cold water pipe - if sulfur dioxide condenses on the cold water line with water it it will form sulfurous acid and sulfuric acid which will corrode copper as in the image.


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