I recently installed new toilets in my home and now after you flush when
toilet fills and shuts off the pipes clank. I know that's caused by air
in the pipes but have no idea how to get the air out. I use all the
faucets in the house and don't know where the air could be.
If I reduce the flow of water to a level where the pipes don't clank
then you get the sound of rushing water which is louder than the
clanking. I've looked at the valve inside the tank and can't find anyway
to get it to shut off more gently.
Anyone have any ideas how to deal with this?
What you are describing sounds like "water hammer". It's actually caused
by the lack of air in the pipes. Most water pipe systems have a tank or
a small vertical section of capped pipe somewhere that is normally
filled with air. When the moving water is suddenly stopped by a closing
valve the water will use the air in the tank/pipe as cushion (sort of
like a shock absorber) and prevent the clanking or hammering sound you
hear. When the tank/pipe fills with water the cushion is gone and the
hammering sound occurs.
To put air back into the tank/pipe, locate the phyically lowest
spigot/faucet in your house. Turn off the water main, open the lowest
spigot/faucet and allow the water to drain out. This process can be sped
up a bit by opening a faucet or two that are higest in the house. When
the water stops draining close all faucets/spigots and turn on the main.
The tank/pipe should now be filled with air and will provide a cushion
when the moving water is suddenly stopped.
It may be water hammer or improperly secured pipes. In either case the
most likely reason it is not showing up is your new toilet is shutting off
suddenly as you suspect. You can try reducing the flow to the toilet by
partly closing the shutoff valve.
Other than that, it is time to check to see the pipes are properly
secured and you may want to draining all the pipes (shut off the main and
open all the valves for a while (shut down the water heater when you do
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