Knock, Knock, Who's There?

Water Hammer can be quite unsettling when you hear it in your plumbing system. Let’s explore why it happens and how to address it.

1. Air Pockets in Your Pipes: Air chambers within pipes are often the culprits behind pipe knocking.  If you notice the noise right after opening a tap, it’s a sign that air pockets are causing the issue.  Try this: Turn on the tap closest to your water meter, then sequentially open and close all other taps.  This may release the trapped air and fix the pipe knocking.

2. Partial Valve Opening: While not a permanent solution, partially opening inlet valves can help reduce pipe knocking. Dishwashers and washing machines are common sources of rapid valve closure, leading to the noise.

3. Secure Loose Pipes: If you can identify the noisy pipe, secure it promptly. Loose pipes can amplify the pipe knocking sound.

4. Water Pressure Limiting Valve: High water pressure contributes to pipe knocking.  Consider installing a water pressure limiting valve at the meter to regulate pressure.

5. Knocking Arresters: These devices, available at hardware stores, can be installed at hot and cold water outlets.

6. Intake Connection Replacement: Devices like washing machines and dishwashers often cause pipe knocking. Try replacing their intake hoses with wider ones.

Remember, addressing water hammering promptly can prevent more serious damage and ensure a quieter and more peaceful home environment.

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To prevent water hammer, consider installing a water hammer arrestor. These devices absorb the shock when rapid-closing shutoff valves interrupt water flow within a piping system, protecting your property from damage1.

Remember, addressing water hammer promptly is crucial to avoid long-term plumbing issues. If you’re experiencing this problem, consult a professional plumber to diagnose, limit, and eradicate the banging in your pipes.

Fawcett Plumbing is very experienced in determining what causes water hammer on your property.

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