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Posted by Doug Brown on January 20, 2007, 12:55 am
Only if the dissimilar metal is left in place or left enough residue on the
copper to cause a reaction.
>
> bent wrote:
>> I pulled some 1/2" copper pipes upward in the summer with wire for
>> clearance
>> in preparation for installing T-bar ceiling tiles. I don't know that it
>> did
>> any damage to the pipe or joint, or even if I have more than a common
>> situation now. I wrapped some pipe insulation, but not completely, this
>> joint in question was tough to get to, and I left it until I was ready to
>> finish it off. Today I was peeling back that same insulation; these
>> pipes
>> go to the sink and toilet in the basement washroom, and the last inch or
>> two
>> of the insulation was WET, meaning waters on the outside. Its been
>> months
>> since its been summer/humidity? in Toronto. I have taken off the
>> insulation, chiseled off the little black rotting part of 2x4", and
>> cleaned
>> off the pipes, but other than the moist insulation I haven't seen any
>> water
>> at all, even when running tissue paper around. The water may even been
>> wicking from down inside the 2x4" in the wall, a crack possibly on the
>> other
>> side of the elbow in the wall. . I don't know if either pipe is
>> dripping
>> from a leak/crack, or if the cold is condensing (its cold to the touch),
>> or
>> the insulation has just stayed wet since last it was humid, or if its
>> bound
>> to happen when I flush.. This pipe is at the end of the plumbing line,
>> nothing else runs past them. The basement is where the hot and cold
>> water
>> are, both at the other far end of the house. The place in question is in
>> the ceiling, running just under the first floor joists. More
>> specifically,
>> where both the hot and cold pipes have 90 degree elbows soldered, and
>> where
>> these pipes turn and go straight down into a stud wall. The drilled hole
>> in
>> the 2x4" top wall plate is just large enough to fit the hot and cold,
>> each
>> in individual holes, so nothing is getting/looking in there. The elbows
>> are
>> just barely solderable above this top 2x4", in fact the cold is
>> half-buried.
>> The two pipes are spaced diagonally, about 1" apart on centers; the pipes
>> run very close together, both along the ceiling, and in the wall. The
>> hot
>> pipe is the upper one. Where the hot elbow is soldered some of the
>> solder
>> of that joint is actually soldered to the upper length of straight pipe
>> of
>> the cold.
>>
>> How do I diagnose if I have a leak? I have not run any hot or cold water
>> in
>> the sink, nor flushed the toilet in a couple days. In the last few
>> months I
>> have only flushed the toilet twice, both times in the last couple weeks.
>> I've just got tissue paper sitting there, waiting for me to look later. I
>> could drill a hole-saw in the wall, but what about running the water,
>> etc.
>> to help find out. A problem is its a tight location, can't see all
>> possibilities, and don't know how to check with a diagnosis. There are
>> more
>> pipes around, but they are all currently insulated.
>>
>>
>>
>>
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>
> If you used a steel wire to pull up the pipe you may have created a
> problem by contacting two dis-similar metals which can over time cause
> the pipe and wire to rot out.
>
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