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Old 09-10-2013, 08:43 PM   #16
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Knocking in water pipes when water turned on


Hi all,

Seems the knocking is ony really coming from the hot water I rechecked and didnt hear any when I turned the cold water on/off. I also lowered the temp on the heater to around 155f, seemed to be a little above 160. All the connections are copper, disnt use any of those metal braided hoses. The plumber did install some new copper, around 12-15 inches worth, as I had a new ball joint valve installled to cut off the water coming in.

when I did turn off the main, I didnt touch the toilet or dishwaser valves, only open then closed the kitchen faucets, bathroom, and 2 water outlets outside.

Any other ideas?

thanks

James

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Old 09-10-2013, 08:51 PM   #17
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Knocking in water pipes when water turned on


Should also run all fixtures to include washing machine, dishwater, and toilets to purge out any air. However, I don't think this is your problem, time to look elsewhere. You have purged everything you could with no results. Read post from "E". and Javilles. Thanks.

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Old 09-10-2013, 08:53 PM   #18
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Knocking in water pipes when water turned on


Dont think I have a pressure reducing valve. Would that be installed right after the main water line valve?
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Old 09-10-2013, 09:03 PM   #19
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Knocking in water pipes when water turned on


Yes, usually, may be further down the line and looks something like this:



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Old 09-10-2013, 09:47 PM   #20
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Knocking in water pipes when water turned on


Quote:
Originally Posted by sbmfj View Post
Hi all,

Seems the knocking is ony really coming from the hot water I rechecked and didnt hear any when I turned the cold water on/off. I also lowered the temp on the heater to around 155f, seemed to be a little above 160. All the connections are copper, disnt use any of those metal braided hoses. The plumber did install some new copper, around 12-15 inches worth, as I had a new ball joint valve installled to cut off the water coming in.

when I did turn off the main, I didnt touch the toilet or dishwaser valves, only open then closed the kitchen faucets, bathroom, and 2 water outlets outside.

Any other ideas?

thanks

James
"E", Javiles,
Could a possible bad/dirty check valve/backflow preventer, prv, or expansion tank cause this issue? Said he turned main on and off several times to purge everything maybe a lot of debris got kicked up. Thanks.
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Old 09-10-2013, 10:06 PM   #21
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Knocking in water pipes when water turned on


First, I don't recommend setting a heater above 130 degrees max. I believe 120 max is actually code. Commercial kitchens run at 140.

You could be dealing with pipe expansion due to temp change. The pipe will actually grow in length as it becomes heated from 150 degree water. The pipe can rub against it's anchors or wood- making snapping, crackling or hammer noises. Hard to locate when inside a floor or wall.

Does the noise decrease after the hot has run for say 5 minutes?
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Old 09-19-2013, 09:47 PM   #22
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Knocking in water pipes when water turned on


Sorry for the late reply. Knocks for about 15-30 seconds then goes away. And it only seems to do so once the water hasnt been on for a good few hours, for example overnight.
I dont seem to have a pressure reducer as pictured above, ill take a picture of it tomorrow and post.

Thanks again for all of your feedback.

Regards

James

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