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Excessive velocity or because of water hammer. which is when pipes are rattling around because they havent been secured properly or when pipes have come adrift from thier saddles.
http://wiki.answers.com/Q/What_causes_plumbing_pipes_to...
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What Causes Water Pipes to Hum?. Humming water pipes are more than an annoyance---they are also a symptom of underlying plumbing problems. Finding the hum's cause and eliminating it can extend the life of plumbing fixtures and... ... eHow Article: What Causes Water Pipes to Hum?
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www.ehow.com/facts_5017210_causes-water-pipes-hum.html
www.ehow.com/facts_5017210_causes-water-pipes-hum.html
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There is much pressure going through these pipes which causes them to move slightly. After a few years they can loosen up enough to bang something when water is flowing through them at high speeds. You’ll easily be able to tell if this is the problem, you’ll hear loud banging whenever you have the water on.
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www.askipedia.com/askipedia-article-016001-1174.htm
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I'm guessing the problem isn't with the faucet, but with the water pipes below it. Try tying down the water pipes. This should keep them from banging around when the faucet is turned on. If this does not work the next thing to do is most likely to replace the faucet, my plumber tells me two things ;
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www.handymanwire.com/questions/plumnoisypipesq.html
www.handymanwire.com/questions/plumnoisypipesq.html
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First of all it does not seem like hammer-nock where the shutting of a valve quickly causes the pipes to bang because of abrupt pressure in the pipes. It does seem as if some people cure this humming problem by reducing the water pressure in the house at the pressure regulator.
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answers.yahoo.com/question/index?qid=20070410213928AAL2...
answers.yahoo.com/question/index?qid=20070410213928AAL2Xtc
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Water hammer happens when you turn OFF a water flow suddenly (like a dishwasher, a clothes washer, a toilet or even closing a hand faucet suddenly. Shutting off the flow suddenly sends a pressure or shock wave down the water line through the water shocking the pipes and creating the 'hammer' noise.
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www.factsfacts.com/MyHomeRepair/PipeNoises.htm
www.factsfacts.com/MyHomeRepair/PipeNoises.htm
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However, since the piping was run I have been experiencing vibrating cold water pipes. The pipes are making a high pitched but variable noise. This seems to occur at random moments through the day and night. It will occur both when no water is being run in the house and when some of the taps are opened.
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en.allexperts.com/q/Plumbing-Home-1735/Vibrating-Hummin...
en.allexperts.com/q/Plumbing-Home-1735/Vibrating-Humming-Cold-Water.htm
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root intrusion, toilet tank, water pipes: HELLO I would first eliminate the toilets from being the cause. Then I would check out the pressure regulator if have one. Lets start with the toilets, excuse caps. WHEN YOU START HEARING ALL OF THESE STRANGE HUMMING SOUNDS, CLATTERING, BANGING,... ... About dispatcher bob;
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en.allexperts.com/q/Plumbing-Home-1735/noise-water-pipe...
en.allexperts.com/q/Plumbing-Home-1735/noise-water-pipes.htm
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Garbage Disposal-How to Fix and Repair; Stop Banging Water Pipes ... It doesn't even hum. Let's fix it. In order to attempt to fix your garbage disposal, it first helps to understand how it works. The disposal's motor powers a flywheel that throws garbage against a shredder. The resulting pulp is then flushed down the...
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alsnetbiz.com/homeimprovement/faq16.html
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