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Eric Axiak
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 Q. When I use the faucets in my kitchen and bathroom sinks, I hear banging in the walls that seems to come from the water pipes. I heard that this is caused by air in the pipes. Is there a simple solution?

 A. Banging or rattling noises associated with water pipes is often due to a condition called water hammer. Water hammer is caused by lack of air in the pipes (not the presence of air). The banging usually occurs when faucets or valves are quickly closed. The pressure of the water, with no air in the pipes to cushion it, makes noise when it slams against a closed valve. Loose piping also contributes to the noise as the vibrations created in the pipe by the sudden stoppage can also cause pipes to knock against structural elements. In addition to noise, the water pressure can cause premature damage to sensitive valves in appliances and fixtures
 
Water hammer can sometimes be stopped by introducing some air into the pipes. In many homes, this can be done by closing the main water valve and opening the lowest faucet in the house (usually a basement or outdoor faucet) and several other faucets. Let the water drain out for about five minutes, until water stops coming from the faucets. Then close all the faucets and reopen the main valve. As the pipes refill, air pockets may form at points in the system to provide the cushion needed.
 
If the noise persists, one or more devices called water-hammer arresters might need to be installed. An arrester maintains the air cushion that is needed to prevent the noise.
 
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