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This 1 inch pipe feeds the furnace, stove, and water heater.
Do I take a wire brush to it? Weld it? Union 2 new pieces together?
I'm in California.
got the photo
you can't weld it or use unions. only a left and right and i believe a left and right still needs to be accessible. don't think it can be buried.
i would lightly wire brush it and see how deep it really is. 1'' pipe is approx. 3/16'' thick. i doubt you've worn it too deep. remember that when the pipe is threaded, a considerable amount of pipe wall is cut away in the threading process.
once you wire brush it, then apply a soapy solution to the area and check for leaks, bubbles. of course you would already smell it if it was leaking. i would clean things up and wash the area. possibly apply a zinc rich instant cold galvanizing spray to further protect the steel from any more moisture prior to repairing the wall surface. it's also important to properly water proof the shower wall that allowed the moisture in.