I have 3/4" copper hot and cold pipes running through the basement. 1/2"
copper pipes run off them to below sinks and then run up to the sinks.
The problem is one that is a 3' run from the 3/4" line to below the sink.
It is now attached to a 3/4" board attached to floor joists. I want to move
the 1/2" lines so they are even with the joists; that means moving them up
about 1.5". There is no problem with the sink as it is connected to the
1/2" pipe with a flexible connector. I am concerned about stressing the
1/2" pipe or the connection to the 3/4" pipe.
Seems to me that copper ought to have enough flex to accomodate moving 1.5"
over a length of 3', but I don't want to find out the hard way that I was
wrong. Anyone with experience here? The pipes are about 25 years old, if
I want to put in a dust collector that requires 91", and I now have only
90"! Any place I can put it has problems with heating ducts or worse.
There is Soft copper and there is Hard copper.
Yours is the latter.
If you try to put a bend in, the tube will buckle
or a soldered joint will likely fail. Wanna risk it??
Cut the pipe and solder in an offset section.
Just for reference, you're talking "tubing", not "pipe." Pipe, whether
stainless, whatever, has much thicker wall, size spec based on ID, and
be threaded with std pipe thread on the outside. Tubing is made such
that the OD
is a close fit into std tubing fittings for reliable sweating of joint.
Copper can be annealed (soft) or un-annealed work-hardened. Note that
arrives as straight sections, some as coil. Guess which is annealed,
Cut and re-fit. When I replumbed my mother's house years ago it got the
usual trunks parallel to the main beam. Each T off the trunk angled up
at 45 degrees with a short stub to a 45 degree fitting to bring it
parallel and then a short stub to a ball valve. Gets the branch line and
valve within the joist cavity and does it with a little less bend and
loss of water flow.
Yeah, when I was in college, the hot water was too hot to tolerate, so
I bought a mixer, that attached to the hot and cold and had an outlet
in the middle. But the faucets toed in a bit, and it wouldn't stay
attached if they didn't point straight ahead. So I twisted them 10
degrees, and everything was fine. For a month or two. Then one
started dripping. I cracked the copper pipe.
(It was 7PM when I noticed the leak. First I put a bucket under the
drip, but after I had to empty the bucket in an hour or two, I put a
wastebasket upside down and the bucket on top of it. Then I ran a
piece of tubing from the bucket to the toilet, which was nexst to the
sink. The tubing was too short, so I added a thick soda straw. I
started it siphoning, and when the bucket was near empty, the
siphoning slowed down. When the bucket got more full, the siphoning
sped up. I was able to leave it like this for 2 weeks and didn't have
to do anything to empty the bucket or restart the siphon.
Oh yeah, I tied a wash cloth onto the leaky part so that I wouldn't
hear the water dripping into the bucket.
I'm sure the plumber would have come much sooner if I had told the
landlord it was a real problem. But it wasn't a problem. The sink
worked fine too.
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