What is water hammer?

Water hammer occurs when moving water in a pipe is forced to stop suddenly, typically because a valve closes quickly or a tap shuts off fast. The water's momentum creates a shock wave that travels through the pipes, producing a sharp banging or clanging noise. In older Perth homes, this is often heard throughout the house when someone turns off a tap or a washing machine completes its cycle.

The pressure spike from water hammer can reach several times the normal water pressure in your system. When these shock waves hit pipe fittings, bends, or walls, they transfer vibrations that amplify the noise. In some cases, the repeated stress from water hammer can loosen joints, crack pipe connections, or damage valves over time.

This issue is common in homes with older plumbing or where taps and ball valves close too quickly. It is worth addressing because while the noise itself is just annoying, chronic water hammer can eventually lead to leaks or joint failure. A plumber in Perth can install arrestors (small chambers that absorb pressure spikes) or adjust valve closure speed to reduce the problem. Identifying water hammer early helps prevent costly damage to your pipe network.