Re: Black pipe coupling on a galvanized water line?
Posted by Charles Goodman on November 27, 19100 at 12:58:05:
In response to Re: Black pipe coupling on a galvanized water line?
: I ran an outside galvanized water line, and at one point needed a bell reducer coupler, and all i could get was a "black pipe" fitting. Later I found out that black pipe is intended for gas lines. Will the black pipe rust, and if so how long can I keep it on before I need to redo the fitting??

: Also is galvanized compatable with brass fittings (eg shut off valve)? Thanks

The black fitting will rust, both inside and outside. It is not intended for water not to be buried. Galvanized pipe is a carbon steel pipe, just as black pipe, however, it the galvanized coating protects it from rust for a few years. You can count on replacing the galvanized in probably 20 years, as the galvanize will erode and leave large blisters of rust inside that will highly restrict the flow of water. Yes, galvanized pipe is compatible with brass fittings (you could replace the black reducer with brass).
Best regards,

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