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Trusso
pipes banging

my water suppply pipes in the basement make a loud banging noise a few times during the day and night. The noise occurs sometimes hours after any water is used so im guessing its not water hammer. Also the toilet mechanism has been replaced so its not the toilet tank leaking. Any idea what it could be?

MLBSF
Re: pipes banging

do you have a forced hot water heating system? it could be air in the pipes or maybe the circulator pumps turning on and off.

JLMCDANIEL
Re: pipes banging

You cab also get water hammer caused by outside water usage. If you are on a main with a factory that uses large quantities of water, their running and shutting off water can cause water hammer down the line.
Jack

Trusso
Re: pipes banging

Thanks for the responses. First off I have a forced air heating so that cant be the problem. I dont know of anything nearby that uses a large amount of water as I live in a residential area. but that being said what would be a possible solution to the problem?

JLMCDANIEL
Re: pipes banging

I would think a water hammer arrestor on the main line if it is the cause.
Jack

JLMCDANIEL
Re: pipes banging

Oh, one other thing, do you have an automatic ice maker?
Jack

Trusso
Re: pipes banging

No ice maker. But I dont know if it matters but I do have a tankless water heater. And on the tankless I do have an expansion tank. Any help is greatly appreciated thanks!

MSSP
Re: pipes banging

Do you or any of your neighbors have automatic sprinkler systems? I have seen this cause water hammer. I agree with Jack a house arrestor on your incoming line should do the trick

Trusso
Re: pipes banging

No sprinklers that i know of. Beside its the dead of winter here. What exactly is the whole house arrestor. I am familiar with the small kind but none of them seem to be adequate for a whole house or are they?

Fencepost
Re: pipes banging

Likewise, I've never noticed any product marketed as a "whole-house water hammer arrestor." I would think an expansion tank like that on your water heater would do the job when placed on the main line.

I'm wondering if it's possibly an expansion/contraction issue. A while after hot water is used, the pipe cools off and contracts. While it's contracting, it's bound up in the holes it passes through in the studs or joists. Eventually, the tension on the pipes overcomes the binding, and it suddenly releases with a loud BANG!. Kind of like the San Andreas Fault, if you will.

Trusso
Re: pipes banging

That being said any suggestions to eliminate the noise. thanks

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