Posted by Kevin Pate on January 14, 1998 at 06:15:12:
In Reply to: Re: Iron to Copper pipe posted by Hill on December 12, 1997 at 08:12:00:
Can anyone tell me how fast copper/iron pipe corrosion occurs? I did a temporary repair and did not use dielectric unions. Will it be okay for weeks? Months? Or mere days? Thanks.
: Yes, use a dialetric union or else the galvanized fitting where the copper is connected will rust from the inside. Use Type M hard copper - it has a red stripe. Hill
: : I'd like to try a bit of replacing an old, long horizontal run of galvanized iron water supply in my unfinished basement with copper - in hopes of getting some better pressure to some 1st and/or 2nd flr. fixtures. When I remove about this 20' section, do I have to do so at a threaded joint, and put a simple threaded to sweat joint and run the copper? Or do I need a "dielectric" fitting at each union between the two pipes? Also, can someone give the 10-cent explaination of the 'type' of copper pipe to use? Not the size, but I've seen some graded by 'type'... and helpful hints? THANKS!