How to prevent water hammer from high pressure?
To prevent water hammer from high pressure, install a pressure reducing valve (PRV) to lower overall system pressure and fit water hammer arrestors near quick-closing valves to absorb shock waves.
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Understanding and Preventing Water Hammer
Water hammer, the banging noise in pipes, occurs when water flowing at high pressure suddenly changes direction or stops due to a quickly closing valve, such as in dishwashers, washing machines, or single-lever faucets. The inertia of the moving water creates a shock wave that reverberates through the plumbing system, causing pipe damage, joint leaks, and noise.
Causes from High Pressure
Excessive water pressure exacerbates water hammer. When pressure is too high, the velocity of water increases, leading to a more intense shock wave when flow abruptly stops. This increased force puts significant strain on pipes and fittings, making prevention crucial for maintaining plumbing system integrity and prolonging appliance lifespan.
Key Prevention Strategies
Primary prevention involves controlling water pressure at the main supply with a pressure reducing valve (PRV). For localized protection, water hammer arrestors are installed near appliances to absorb the shock. Ensuring pipes are properly secured also helps reduce vibration and noise.
Considerations and Limitations
While these methods are highly effective, very old or improperly installed plumbing systems may still experience some water hammer, even with mitigation. Extremely high municipal water pressure might require professional assessment beyond standard PRV installation. Additionally, worn or faulty valves on appliances can contribute to water hammer regardless of overall system pressure or arrestor presence.
Proactive Steps to Eliminate Banging Pipes
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Check Your Water Pressure: Use a water pressure gauge on an outdoor spigot to determine if your household water pressure exceeds the recommended 60-80 psi.
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Install a Pressure Reducing Valve (PRV): If pressure is consistently high, have a licensed plumber install or adjust a PRV on your main water supply line.
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Install Water Hammer Arrestors: Attach water hammer arrestors (air chambers or mechanical devices) close to quick-closing valves on appliances like washing machines and dishwashers.
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Secure Loose Pipes: Inspect visible pipes and use pipe clamps or straps to secure any loose sections, preventing movement and reducing noise.
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Bleed Air from System: Periodically turn off your main water supply, open all faucets to drain the system, and then slowly reopen the main supply to refill, allowing trapped air to escape.
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