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Radiator Still Leaking After Repair
I have a single pipe steam radiator system in my 1927 house. Last year I noticed that two of my radiators were leaking from the union joint. The one in the dining room would fill a small tupperware container while I was at work or overnight and would also soak through a dishtowel and washcloth I placed under the container. The leaking radiator in one of my bedrooms was a bit more sporadic; I would sometimes have an inch or so of water in the container and sometimes wouldn't have any. I tried tightening the nuts last year but it did not stop the leaks. I would have to top off my boiler with water every 2-3 days.
This year my boyfriend and I disconnected the radiators from the pipe that comes up through the floor and applied pipe dope to the threads, tightened the union nuts, and made sure that the radiators were slightly off-level and sloping towards the floor pipe. I let the pipe dope dry for over 24 hours before turning the heating system on for the first time this year. Our repairs did not help. Within an hour or so the containers had water in them and needed to be emptied after only a few hours.
Any thoughts on what else could be wrong? I'm wondering if we used too much pipe dope (we put on a generous amount) which is interfering with the seal it is supposed to create or if he did not move the radiator completely into the pipe. The last one seems unlikely because when I tried to finger tighten the nut it moved evenly and fairly easily over the threads.
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