Knocking Pipes
Posted by Kirk on November 01, 2001 at 22:46:58:
I'm getting a knocking noise in my water pipes, but it is not associated with any usage of the faucets. It is a sudden, sharp knock, and is coming from the utility room, where all the plumbing branches out. It occurs regularly, sometimes more than once a minute, sometimes every 5 minutes, sometimes it's quiet for hours. It is not associated with any water flow - no toilet flushing, faucets, refrigerator icemaker or shower. Nothing. The construction is new, all the supply pipes are copper, and it includes a small tank in the line with a rubber diaphragm which I understood was supposed to prevent this sort of knocking.

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