Plumbing in the Home/Vibration in water lines


Hi Carolyn,
I hope you can help with my problem.My wife & I purchased a ranch home with full basement 2yrs ago.The house was built in 2000, so I know age has nothing to do with it.We started having a problem with a very loud rhythmic vibration coming from the main water line that feeds into the the basement.I tried bleeding the system of air a few times, but once the water was turned back on,after a while the noise resumed.I called the water company and they came out and installed a new meter, as I was told the original meter was a 1/2 and I needed 3/4,which they installed.That cured my problem for about 7 mos, and I had them come back out for the same reason.This tech couldn't tell me what the problem was, so thay again replaced the meter, and once again, the vibration went away until now.I am hopeful you may have some idea of what is causing this.The water is not running from any source when this vibration ic occurring.We do have a outdoor sprinkler system, but that has not been used for 2 yrs, and that system is shut off and it's valve regulator is removed.

Hey Tom,
Happy New Year for starters!  I believe what you are experiencing is what is called water hammer due to high water pressure. Do you have a water regulator installed on your main water line coming into the house?  If so, you may just need to adjust it down some and see if the hammering stops, if not then you may need to install some arresters.  Normally an arrester can be installed at the end of the line to prevent this from happening. Based on what size your water line is, you just have to match up the correct arrester for copper or PCV.  Check out these sites, they will explain a lot more. Loose pipes can also cause this so if you can do an inspection you may be able to rule this one out.

I hope this helps and good luck!

This is a long but good explanation of water hammer:

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