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Frequent replacement of black pipe nipples and other fittings.
In the past few years, I've had to replace several nipples and fittings in my low-pressure steam heating system. An old timer in my area has told me that it's because of the cheap steel that comes from China that may contain many impurities. As well, I have recently been told that using pipe dope on threaded fittings will decrease the life of the fittings since the pipe dope reacts with the hot steam and the chemical reactions caused by the process will "eat away" the black nipples and tees etc. especially the threads. I have had to replace several black pipe fittings in the past few years. Some lasting only one or two years.
Any thoughts on whether the pipe dope could be contributing to the premature replacement of black pipe fittings?
The pipe dope I use now is grey in color.