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  1. #1
    cory nystul's Avatar
    cory nystul Guest

    Default iron pipe cap in radiant

    I found this cap, it appears to be black iron pipe attached to copper piping. Will black iron in contact with copper corrode /rust like galv. will?

    Also what are the views of black iron used in plumbing that contains water such as radiant heating?


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  2. #2
    Join Date
    Feb 2008
    Caledon, Ontario

    Default Re: iron pipe cap in radiant

    Two dissimilar metals. Galvanic reaction. Better to have used a copper cap. Likely whomever used what was at hand.

    Yes black pipe can be used in radiant heating for manifold, supply and returns use only. Should not be buried in concrete or under earth.

  3. #3
    Join Date
    Mar 2012
    Lansdale, PA

    Default Re: iron pipe cap in radiant

    Black iron used in heating systems can last forever (not buried in concrete). Oxygen is purged from the system, so corrosion is not an issue.

    Copper and black iron certainty can be an issue.

  4. #4
    Join Date
    Sep 2012
    Columbus, OH

    Default Re: iron pipe cap in radiant

    Never seen a copper cap, but a brass cap would be fine.


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