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Posted by bobby7388 on October 29, 2004 at 16:39:41:
In Reply to: Getting Black Iron pipe threads to seal posted by Bill LeClair on October 29, 2004 at 10:09:34:
: I am having a hard time getting the black iron pipe to seal, I am installing a new boiler and I have a couple of connectors that are weaping water. I have been using pipe Rectorseal "5". Cleaning the threads with a wire brush then aply sealent and screw pipes together. There is a note not to over torque to strech the threads. Maybe this is my problem? Please help with a procedure you may have used. I want to be able to assemble these joints with confidence. As you know it is a royal pain to take these apart.
If this a lo temp/lo pressure situation try to go with teflon tape, then pipe dope, then teflon tape then connect the pipe/fittings. This even works very well on medium pressure/temp situations.
The problem with using a paste sealent is that it lowers the friction upon tightning and this will cause you to over tighten without much effort which could easily stress the threads.