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Thread: Black Pipe for Hydronics?

  1. #1

    Default Black Pipe for Hydronics?

    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. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    I'm not a pro, but I think you need dielectric junctions between the iron and copper, brass nowithstanding.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member finnegan's Avatar
    Join Date
    Aug 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 by finnegan; 11-10-2005 at 07:47 PM.

  4. #4


    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.
    CO and Smoke detectors save lives. Know your limitations and when to get a PROFESSIONAL. Your life and others may depend on it. Volunteer to be a local Fireman or EMT and help your community.


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