Old school cast iron pipe repair

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by turkboy, Jun 26, 2012.

  1. turkboy

    turkboy New Member

    Jun 26, 2012

    I am trying to repair a cracked pipe in a very old building. The drainage is made of old cast iron pipe. The problematic area is as follows, a "Y" connection, to a 6" straight pipe, threaded into another pipe. The 6" pipe is cracked and threaded on both ends. The threaded joints seem rusty. The people at the hardware stores seem to be unfamilar with cast iron pipes. It seems like the best advice I got so far was;

    Cut the 6" pipe down the middle, unthread both ends, thread in ABS adapters, and glue in about 6" of straight pipe.

    See image attached. pipe.jpg

    Is this the way to go?
    If so, won't unscrewing the pipe be murder, is there a trick of the trade, like torching it.

    Thanks for the help.
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    You will need a good sized pipe wrench. Sometimes a bit of heat on the fitting helps, though you don't want to burn the building down either. It may be easier to go beyond the 2" x 6" nipple and see if removing the next small fitting solves anything. Going inside the fitting will need either a threaded adapter or threaded pipe.
    If you go beyond the fitting and toward the pipe on the other side, you may be able to use no-hub couplings there. If you could use no-hub couplings on both sides of the repair, you could insert that section, roll back the bands, slide the covers back over and tighten them up. It's a thought.
    Last edited: Jun 27, 2012
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  4. mikeplummer

    mikeplummer Plumber

    Mar 28, 2012
    Ontario, Canada
    what size is the pipe you're working on?...doesn't look like cast to me...looks like iron/galvanized pipe...
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    It is 2" galvanized between what appears to be two "Y"s. 6" is pretty tight to fit two threaded pieces and two No-Hub couplings. There is no way to screw in two threaded adapters and glue in a section of pipe, because you cannot spread the two ends apart to fit it in.
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