I want to put in a tee for a new drip line and flexible gas connector when I replace my water heater. It is currently connected with piping all the way to the water heater. The problem is that there is not a union fitting where I would like one to be.
In order to make the modification, I have to try to unscrew a section of 30 year old Black Iron Pipe attached to an old 'T' OR I have to cut the line after the 'T', rent a threader, cut threads, and install a union. (after shutting gas and purging with air of course)
What are my chances of gently unscrewing the pipe out of the old 'T' fitting and then installing a new section of piping into that old 'T'. I have experience with new galvanized piping, but I have not tried to re-use 35 yr old fittings. If the pipe was originally fitted to the 'T' without over-torquing, is there still a good chance that it can be re-used OR would it be wise to just plan on renting the threader and leaving the old fitting alone?
Rald