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Old 03-29-2012, 08:00 PM   #1
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Old steam pipe sealing

Hi and thank you all ahead of time. In my house we had old cast iron radiators that worked up until a few years ago when we switched to electric baseboard heaters. I took out one of the radiotrs and sealed the pipe that carried the water to the radiortor, but I had to saw the second pipe that took the cold water away in half and now i'm trying to disconnect it with zero luck. I have heated the joint, lubricated it, used a pipe wrench with a breaker bar and it wont disconnect from the joint. Is there anyway that i can just put something in the pipe that will seal it without having to thread it and put a cap on it? The pipe is 1 inch iron pipe.
Thanks for any ideas!


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Old 03-29-2012, 08:54 PM   #2
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If the old pipes are not doing anything anymore why not just cut them all off and remove all of them?


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Old 03-29-2012, 08:58 PM   #3
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Sorry for the long delay----why do you want to seal it if the system is no longer in use?

If the system is still under pressure you will need to get a joint unthreaded--if there is no pressure,just saw off the pipe and add a rubber Fernco cap with a hose clamp.
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Old 03-31-2012, 09:31 AM   #4
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I want to seal it just so I don't have an open pipe in the basement because with my luck something will go wrong and water will appear, because this system is well over 75 years old I don't really want to trust the shut off valves. Thanks for the idea with the Rubber cap I think I'm going to try that.
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Old 03-31-2012, 10:51 AM   #5
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If the system has already been permanently decommissioned with some radiators or other components removed, then cut the pipe at the upstream end, say, at a shutoff and then all the downstream cut ends will be guaranteed not to gush water.

For two pipe steam or FHW systems you have to cut both the supply and return at the upstream end.
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radiators , sealing a pipe

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