"Duane Bozarth" wrote in message

...If they replaced _sections_ of existing galvanized because it was
failing, in all likelihood any other galvanized is also on the verge as
well if it hadn't been done already. I'd think it worth seriously
considering whether the full job shouldn't be done at the time of doing
the black replacement rather than just replacing the newer joints of
black pipe.

That would include the possible use of galvanized throughout including
things like the feeds to the showers, lavatories, etc., that could have
leaks develop "any day now" if they're the same age as the replaced.


Good point! Also in some areas, "crud" will build up inside the pipes due
to the water for the area. This can reduce the water flow over time. So you
look inside a 3/4" pipe and there is 1/4" for the water to flow!

Also old hot water heaters can release crud into the hot water pipes,
clogging the valves. Sometimes the pipes can be "back flushed" to solve
these problems.