Black Pipe for Hydronics?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sdoor, Nov 10, 2005.

  1. sdoor

    sdoor New Member

    Nov 10, 2005
    Should I be using black pipe to replace the supply and return manifolds connected to my cast-iron boiler. Or galvanized? Currently the setup has black pipe. I'm planning on using brass fittings between the copper and iron.

    Also, about how much torque should be applied to tighten the fittings for 1.25" black pipe?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I'm not a pro, but I think you need dielectric junctions between the iron and copper, brass nowithstanding.
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  4. finnegan

    finnegan New Member

    Aug 16, 2005
    Brass alone is fine. You can really torque black pipe without doing any damage. I do not know what the suggested torque is, but I go pretty heavy and I have never run into a problem. I do not know how else to describe torque.
    Last edited: Nov 10, 2005
  5. jeffreyhel

    jeffreyhel New Member

    Nov 4, 2005
    Black Pipe is just fine.
    Water in a hot water boiler looses it's aggressiveness (becoming ph neutral) after it has been reheated over and over. Therefore black pipe is fine. Live sprinkler head systems are based on this same principle. No new water = ph neutral water provided nothing new is added or subtracted.
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