Water Hammer?
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The above answers are both good. One way that may stop water hammering, at least for a while, is:
Turn off the water to the building.
Open all faucets in the building, letting any water in the pipes to drain.
Once drained, close all faucets.
Turn the water back on to the building.
If the building initially had air chambers over time a small leak may have filled the air chamber with water. This could cause the hammering. By draining all water, any water in the air chamber would also drain and thereby giving you a new air chamber.
Water hammer is the term used to describe the sound made when a faucet or valve is closed rapidly and the water in the pipe is traveling rapidly and comes to an abrupt stop. The sound is like hitting the pipe with a hammer. There are devices called "cushions" or air chambers that are designed to absorb the sudden stop impact and thus quiet the effect.
Another cause of water hammer is a fluttering washer in the valve. When you first turn on a faucet the fluttering causes a series of hammering sound before finally quieting down.
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