I've just had a lawn sprinkler system installed, and every time it
turns on, my pipes make a lot of noise. It is a loud "hammering"
noise. I've been looking up articles on water hammer, but everyone
says that's what you hear when you turn a valve off; this happens
constantly while the system is running, about 4 times per second.
I'm also used to hearing a slight ticking noise from the meter when
the dishwasher or laundry machine is filling, but this is much louder.
I had a plumber do some of the inside work, to put an extra pipe in to
go out to the sprinkler system. He assumed the sprinkler guy was
going to punch a hole in the front of the house.. the sprinkler guy
decided he'd rather have it in the side of the house. As a result,
sprinkler guy had to add a sharp 180 degree turn in the pipe to get it
redirected to the side of the house. Could this be causing the
I'm not too concerned if it's simply noisy, I'm just curious if this
could cause damage to my pipes. Any ideas?
TIA for advice.
When it is making the noise go down and listen and feel the pipes to
find where the noise if coming from. I'd look for insufficient or poor pipe
support. I would also suggest the sprinkler man should not have needed to
make a 180, but should have cut the pipe back.
Water hammer is usually caused by a sudden stop and start of water flow.
Most solenoid valves (ice makers, dishwashers, washing machines) have these
electric valves that shut instantaneously (which is why you seldom hear it
by slowly closing a faucet.) To help eliminate this problem, I would be
sure that all of the piping is properly strapped in place. This will reduce
the noise but will not stop the hammering effect. You can get a hammer
arrestor (also known as a shok-stop) installed on the line. This would be
at the end of the largest water line. The are usually 3/4" round and have a
sealed air chamber with a spring mechanism which acts as a shock absorber.
Some plumbers install just a piece of copper tubing about 12" long with a
cap on the end, but over a period of time, they will waterlog and will lose
Best of luck to you.
Jim Mc Namara
In alt.home.repair on Mon, 04 Aug 2003 14:02:16 GMT "Jim Mc Namara"
Good to know. Thanks.
What I've been using are easy to install things that go one the hot
and cold intakes of the washing machine. Probably have them at Home
Depot, but I don't know how long they will last until waterlogged.
Even though the chambers point up, after the rubber breaks, it won't
take so long before the air is absorbed by the water, right?
Originally the washhing machine hoses accomplished what the hammer
arrestor is supposed to do.
I didn't turn the water to the machine off after every use, because my
mother never did, and the warning in the manual seemed like
boilerplate. They have so many warnings it is hard to tell the
important ones from the ones that are just there for the 1 in 10
million times something goes wrong and they don't want to be sued.
This one is important, for I'm told washing machine hoses usually
burst after ????? 10??? years.
So mine did and I'm lucky I heard the noise when I woke up in the
Now I have woven stainless cover hoses. The cover keeps the rubber
from stretching, and I don't turn off the hoses even though I should,
But that created water hammer.
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