Old school cast iron pipe repair

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turkboy

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Hello,

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

Questions:
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.
 

Terry

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

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.

pasco-torque-wrench.jpg
 
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hj

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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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Hey, wait a minute.

This is awkward, but...

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