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  1. #1
    Join Date
    Apr 2012
    Posts
    212

    Question Removing Old Cast Iron Section

    I could use some good recommendations on the easiest way to remove a section of old cast iron pipe. It is the 45 degree section circled in the picture below. The pipe looks to be either 1 1/2" or 2". It goes into a 4" section with appears to be soldiered with lead so I didn't want to disturb that piece. If I can remove the 45 degree elbow I should be good to go.

    Should I heat the pipe up with a torch and try to unscrew it, or just cut the entire piece off with a reciprocating saw? I was told that these blades (http://www.amazon.com/LENOX-9114G-Ti...R#brandRatings) cut through case iron rather easily so that wouldn't be an issue. Once I start working on this I am committed to finish it because the pipe goes to my sump pump which I am replacing, so the least amount of time taking this apart the better. Which would be the best way to remove this 45 degree elbow? Thanks.



  2. #2
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: Removing Old Cast Iron Section

    the easiest way by far is to use a grinder with a metal disc. it will take less than 30 seconds to make the cut. i do it all the time. normally these fittings are taken apart with a 2-3 pound sledge but you don't want to damage the other pipes. if you don't have a grinder then the sawzall will be just fine.

  3. #3
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,598

    Default Re: Removing Old Cast Iron Section

    I prefer a side angle grinder too because it will give you the best cut. Wear eye protection.

    If you run a new pipe instead use no hub connectors. Make sure you have all your parts available.

  4. #4
    Join Date
    Apr 2012
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    212

    Cool Re: Removing Old Cast Iron Section

    That's funny because I was just looking at grinders.

    Would a 4" grinder be too small?

  5. #5
    Join Date
    Apr 2012
    Posts
    212

    Question Re: Removing Old Cast Iron Section

    Quote Originally Posted by dj1 View Post
    If you run a new pipe instead use no hub connectors.

    If I am able to unscrew the old cast iron elbow, and I can find a PVC fitting to screw on there, wouldn't that be better?

    Or is it bad to connect PVC directly to cast iron?

  6. #6
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: Removing Old Cast Iron Section

    you can get a pvc fitting to screw onto there but the odds of unscrewing it are down pretty close to zero. a 4" angle grinder will be fine.

  7. #7
    Join Date
    Apr 2012
    Posts
    212

    Question Re: Removing Old Cast Iron Section

    Quote Originally Posted by MLB Construction View Post
    you can get a pvc fitting to screw onto there but the odds of unscrewing it are down pretty close to zero.
    What if I heated it up with a torch? Wouldn't that expand the pipe and allow it to come off?

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