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Plumbing pipes make a banging noise after the toilet is flushed

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The float valve that controls the level on water in the tank. is going bad. when they start to go bad the water pressure cause the the valve to flutter (tries to open and close at the same time.

Posted on Oct 17, 2013

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Why does the toilet make so much noise filling FluidMaster 703A5B


Just replace the flush valve with another one.
Flush the water line by opening valve before attaching new flush valve

Aug 07, 2014 | Fluidmaster 507C White Flush Valve

1 Answer

Noisy water pipes when neighbours use water


Install air chamber to cushion sudden-stop of flowing water.
Water flow coming to sudden stop is called water hammer, and will bang pipes, but also loosen plumbing joints, causing leaks.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#bang
http://waterheatertimer.org/images/Flow-rates-water-hammer-600.jpg

Air chamber has to be vertical, and about 18" long, with cap on top.
By code each Hot and Cold line at each tap will have air chamber located behind the wall. So there are two air chambers at each tap.

In your case, you can probably add air chamber to your Hot and Cold lines and solve problem for both dwellings.

Water hammer is caused because water does not compress like air.
So when long column of water suddenly stops... the whole pipe-full of water comes to sudden halt... and that water could weigh 1-1/2 pounds ... and just like a hammer head moving, the weight of water bangs the pipes to dissipate energy, causing noise.

Apr 21, 2013 | Water Heaters

2 Answers

Banging noise when hot water is turned off


plenty of water pipes particularly in older houses where pipes may not be fastened tightly or at all to the frame of the house suffer from what plumbers refer to as waterhammer. This can be fixed by installing a small device inline from your local plumbing shop. It can also often be solved ( I have found) by fastening you water pipes at closer intivals/more securely to your house frame. Hope this helps. Mine stopped doing it once the pipes were locked in place.

May 11, 2012 | Rinnai Water Heaters

1 Answer

I HAVE A 50 GALLON 5YR OLD RICHMOND HOT WATER TANK SOMETIMES YOU TURN ON HOT WATER AND IT RUNS FINE.THEN ALLOF A SUDDEN THE WATER STOPS AND PIPES BANG.WE HAVE 44PSI COMING IN FROM CITY


What you're describing is "water hammer". This problem, left unchecked, can cause big problems for your home's plumbing. Water hammer is result of quickly shutting off the flow of water in your home. The faster the rate of water flowing when it is rapidly shut off can result in very loud banging. The banging is caused by the pipes shaking in the walls, ceilings and any place they aren't secured. This repeated shaking causes soldered and glued joints to weaken and eventually fail. The most common sources for water hammer are toilets and wash machines, but even quickly shutting off a faucet can cause it too.

An short article about water hammer is here. Below is a link to images of products designed to arrest water hammer and associated noise.

Please rate this reply - I hope this helps!

Dec 06, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Only hot water in sink/basin when toilet is flushed


I had a customer a few weeks ago that had the same problem. When the water heater was installed they crossed the supply lines. They had the inlet as the outlet. Esentially, the water heater was plumbed in backwards. Also there could be a miss piping somewhere in the house but it would probably be near impossible to find it right now without tearing up foundations. Also check that the faucet is not plumbed backwards as well. Especially if this is a single handle faucet that you are referring to.

Apr 06, 2009 | Rheem Tankless Hot Water Heater...

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