Is the original pipe black pipe?

Discussion in 'HVAC Heating & Cooling' started by Recruiter, Jan 6, 2016.

  1. Recruiter

    Recruiter New Member

    Jan 6, 2016
    Pawtucket, Rhode Island
    I have a 110 year old multi family house that has asbestos covered FHW supply and return lines feeding radiators on the first floor. (BTW: the asbestos is already encapsulated). The previous owner uncovered the 1 1/4" pipe, to a fitting, then connected copper reducer fittings down to 3/4" in order to install a Slantfin 4 ft. baseboard radiator in the bathroom. Due to major renovations that are needed in the bathroom, I will be replacing the baseboard heater, since it was damaged during the renovations and the copper connections now leak at the copper fittings.

    I am looking to replace the copper with PEX.

    1. Is the original 1 1/4" piping black pipe? 2. If so, will I be able to use a black pipe 1 1/4" to 3/4" reducer directly to a Pex brass connector without an issue of corrosion or electrolysis? 3. What would I use on the threads? Is tape OK?

    Last edited by a moderator: Jan 6, 2016
  2. Dana

    Dana In the trades

    Jan 14, 2009
    The original most likely WAS iron pipe, and most likely a steam system.

    It's fine to hook up brass / bronze / copper to iron in hydronic heating systems.

    Teflon tape is fine, so is pipe-dope.
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