Separating threaded cast iron pipes

[MasterPlumbersKeymaster]

I am having difficulty separating a cast iron supply pipe. It is threaded, and has some kind of hardened compound (yellowish in color) on the exposed threads.

Any tricks to get this loose? more muscle? heat? will a larger pipe wrench help me to just break that bond?

thanks

[DUNBARParticipant]

I would use a torch and heat up the joints you are trying to remove the piping from.

[racefanoneParticipant]

I doubt if you have cast iron supply pipes. They are more than likely steel.You could try turning them in the direction to tighten them a little,until they turn,then unscrew them. Works for me.

[Retired plbg1Participant]

Try holing 1 hammer againt the fit and hit the other side lightly. If that dont work saw it out and cut new thrad and use a union and put it back new.

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