The noise you’re hearing from the water pipe when you turn off the faucet in the shower is likely due to a phenomenon known as “water hammer.” Water hammer occurs when the flow of water is suddenly stopped, causing a pressure surge or shock wave to travel through the pipes. This can create a loud banging or thumping noise.
Here are a few common causes of water hammer:
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Sudden Valve Closure: Quickly turning off the faucet can cause the rapid stopping of water flow, leading to a pressure spike.
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High Water Pressure: If the water pressure in your home is too high, it can exacerbate the effects of water hammer.
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Loose Pipes: Pipes that are not properly secured can move and bang against walls or other pipes when the water flow is abruptly stopped.
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Air Chambers: Some plumbing systems have air chambers designed to absorb the shock of water hammer. Over time, these can become filled with water and lose their effectiveness.
Solutions
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Slowly Close Faucets: Try to close the faucet more gradually to reduce the sudden stop in water flow.
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Install Water Hammer Arrestors: These devices are designed to absorb the shock wave created by water hammer.
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Check Water Pressure: Ensure that the water pressure in your home is within a normal range (usually between 40-60 psi). You can use a pressure gauge to measure this and install a pressure-reducing valve if necessary.
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Secure Loose Pipes: Make sure all pipes are properly secured with clamps or straps to prevent movement.