Why Do Pipes Still Bang After Arrestor?
Installing a Water Hammer Arrestor is a popular solution to reduce loud piping noises and protect a home’s plumbing system. But many homeowners find that even after adding an arrestor near their washing machine, noise or vibration remains — or returns after time. This leads to an important question: what else could be causing persistent water hammer issues?
First, water hammer symptoms can be influenced by several factors beyond sudden valve closures. High system pressure, for example, can cause stronger shockwaves that overwhelm a single arrestor. Some homeowners have experimented with pressure reduction valves on the main line to lower overall pressure and reduce the likelihood of hammering. Secure pipe supports and brackets also play a role: loose or inadequately supported piping may transfer vibration noises even after an arrestor is installed.
Another scenario discussed in online communities is when water hammer seems to originate from fixtures other than the washing machine. In these cases, installing arrestors only near the laundry connection might not address hammering caused by other appliances, toilets, or faucets. Some users have tried adding additional arrestors throughout the system or even an expansion tank. These steps can help distribute pressure absorption more evenly across multiple points, though they require careful planning and, frequently, professional consultation.
Additionally, long-term plumbing conditions like failed valves, sediment buildup, or worn components can mimick or exacerbate water hammer symptoms. If an arrestor fails (for example, due to waterlogging or O-ring failure), it may need replacing to restore effectiveness. Continuous hammering noise, despite arrestor installation, is often a sign to re-evaluate the entire system rather than rely on a single fix.
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