Image Source: www.nwfdailynews.com
How Do You Stop Water Hammer Effectively?
Water hammer, often experienced as a loud banging or thumping noise in your pipes, is typically caused by a sudden stop or change in water flow. The most effective ways to stop water hammer include installing plumbing shock arrestors, using water hammer arrestors, and incorporating surge suppressor plumbing devices.
Deciphering Water Hammer Causes
Water hammer, scientifically known as hydraulic shock, is a pressure surge or wave caused when a fluid (like water in your pipes) is forced to stop or change direction suddenly. Think of it like hitting the brakes hard on a car – there’s a jolt. In plumbing, this jolt is the banging sound you hear.
Common Triggers for Water Hammer:
- Quick-Closing Valves: Solenoid valves in appliances like washing machines and dishwashers are primary culprits. When they snap shut instantly, the moving water has nowhere to go and creates a pressure wave.
- Manual Valve Closure: Closing a faucet abruptly can also initiate water hammer.
- High Water Pressure: Excessively high municipal water pressure can exacerbate the effects of sudden flow changes.
- Air in the Lines: While air chambers are designed to prevent water hammer, if they become waterlogged, they lose their effectiveness.
- Loose Pipes: Pipes that are not securely fastened can vibrate and bang against surrounding structures when a pressure surge occurs.
- Faulty Check Valves: A check valve that slams shut can also cause this phenomenon.
The Physics Behind the Noise
When water flowing through a pipe is stopped abruptly, its kinetic energy has to go somewhere. This energy converts into a pressure wave that travels back through the pipe at the speed of sound in water. This wave can bounce off elbows, tees, and closed valves, creating a series of pressure fluctuations and the characteristic banging or thudding sound. If these pressure surges are strong enough, they can even damage your plumbing system over time, leading to leaks or burst pipes. Fathoming these causes is the first step to finding solutions.
Solutions for Plumbing Noise Reduction
Once you’ve identified that water hammer is the issue, the next step is to implement solutions for plumbing noise reduction. Several methods can effectively tackle this disruptive problem.
Installing Plumbing Shock Arrestors
Plumbing shock arrestors are specifically designed to absorb the shock waves created by sudden changes in water flow. They are essentially small devices that contain a chamber of air or gas, separated from the water by a diaphragm or piston.
How Shock Arrestors Work:
When a pressure surge occurs, the moving water pushes against the diaphragm or piston. This action compresses the air or gas within the arrestor, absorbing the energy of the shock wave and preventing it from traveling further down the pipe. This process significantly reduces or eliminates the banging noise.
Types of Shock Arrestors:
- Piston-Type Arrestors: These use a sealed piston that moves within a cylinder. The piston absorbs the shock.
- Diaphragm-Type Arrestors: These have a flexible diaphragm that separates the water from a trapped air charge.
Water Hammer Arrestor Installation: A Practical Guide
Correct water hammer arrestor installation is crucial for their effectiveness. These devices are typically installed on the supply lines of appliances that have quick-closing valves, such as:
- Washing machines
- Dishwashers
- Ice makers
- Pot filler faucets
Step-by-Step Installation:
- Turn Off the Water Supply: Locate the main water shut-off valve for your house and turn it off. Also, turn off the valves supplying water to the specific appliance.
- Drain the Lines: Open a faucet downstream from where you’ll be working to relieve any remaining pressure and drain the water from the pipes.
- Locate the Connection Point: Identify the flexible water supply line connecting to the appliance.
- Install the Arrestor:
- For most arrestors, you’ll simply screw them onto the threaded outlet where the supply line connects.
- Ensure the connection is snug but avoid overtightening. Teflon tape or pipe dope can be used on the threads for a better seal, but check the manufacturer’s instructions.
- Reconnect the appliance’s supply line to the outlet of the arrestor.
- Turn Water Back On: Slowly turn the main water supply back on and check for any leaks at the arrestor connections.
- Test: Operate the appliance to see if the water hammer noise has been eliminated.
Important Considerations for Installation:
- Orientation: Most arrestors can be installed in any orientation, but it’s always best to consult the manufacturer’s specific instructions.
- Accessibility: Install them in accessible locations for future maintenance if needed.
- Proper Sizing: While most residential arrestors are standardized, ensure you purchase the correct type and size for your plumbing.
Surge Suppressor Plumbing Devices
Surge suppressor plumbing devices are a broader category that includes water hammer arrestors, but can also refer to other mechanisms designed to manage pressure fluctuations. They act as a buffer against sudden spikes in water pressure.
How They Function:
These devices work by providing an air cushion or a flexible barrier that can expand or contract to absorb excess pressure. This prevents the shock wave from propagating through the system.
When to Consider Surge Suppressors:
- If you have multiple appliances that cause water hammer.
- If high municipal water pressure is a contributing factor.
- For a more comprehensive approach to plumbing noise reduction.
Air Chambers for Water Hammer
Air chambers have been used for decades as a simple, passive method to combat water hammer. They are vertical lengths of capped pipe installed above the horizontal supply line.
The Principle of Air Chambers:
The idea is that when a pressure surge occurs, the water is forced into the air chamber, compressing the trapped air. This air cushion absorbs the shock.
Challenges with Air Chambers:
- Waterlogging: Over time, the air in the chamber can become absorbed into the water, rendering the chamber ineffective. This is a common reason why older homes might experience renewed water hammer issues.
- Effectiveness: They are generally less effective than modern arrestors, especially for severe water hammer issues or with the rapid-closing valves of modern appliances.
- Installation: They need to be installed vertically, and if they become waterlogged, they often need to be drained and re-pressurized by shutting off the water and opening the highest faucet to let the air back in.
Pipe Shock Absorber Mechanisms
Beyond dedicated arrestors, other mechanisms can act as a pipe shock absorber.
- Securing Pipes: Loose pipes are a significant contributor to noise. Using proper pipe clamps and supports can prevent the pipes themselves from vibrating and banging. Ensure pipes have adequate support throughout their runs, especially near connections and appliances.
- Water Pressure Regulation: Installing a pressure reducing valve (PRV) on your main water line can significantly help if high municipal pressure is a contributing factor. A PRV maintains a consistent, safe pressure level, making the system less susceptible to severe shock waves.
- Looping Pipes: In some cases, creating a small loop in the piping system can act as a form of shock absorber, although this is more of a system design consideration than a retrofit solution.
Strategies for Reducing Water Hammer Effect
Implementing a combination of these solutions can lead to effective reducing water hammer effect in your home.
Addressing Specific Appliances
- Washing Machines and Dishwashers: These are prime candidates for installing dedicated water hammer arrestors on both hot and cold water lines.
- Ice Makers: The solenoid valve on an ice maker is often small and can cause a sharp jolt. An arrestor is highly recommended.
- Single-Lever Faucets: While not as aggressive as appliance valves, rapidly closing a single-lever faucet can still cause noise. Arrestors can help here too.
System-Wide Considerations
- Main Line Pressure: If your home’s water pressure exceeds 80 psi, installing a PRV is a wise investment. This not only helps with water hammer but also protects your entire plumbing system and appliances from excessive pressure.
- Pipework Integrity: Regularly inspect your plumbing for any signs of leaks or loose fittings. Ensure all pipes are properly secured to joists and studs.
Troubleshooting and Maintenance
Even with the best solutions, occasional troubleshooting might be necessary.
When an Arrestor Doesn’t Work
- Incorrect Installation: Double-check that the arrestor is installed correctly and that all connections are tight.
- Wrong Location: Ensure the arrestor is placed as close as possible to the source of the water hammer.
- Faulty Arrestor: In rare cases, the arrestor itself might be defective.
- Multiple Causes: Sometimes, water hammer can stem from more than one issue, such as loose pipes and quick-closing valves.
Maintaining Air Chambers
If you have older air chambers, they may need periodic draining. To do this:
1. Turn off the main water supply.
2. Open the highest faucet in your house to allow air into the system.
3. Open the lowest faucet (like in the basement or outside) to drain the pipes.
4. Close the lowest faucet.
5. Turn the main water supply back on slowly.
6. Close the highest faucet. This process should re-introduce air into the chambers.
Conclusion: Quieting Your Plumbing
Water hammer is a common but fixable plumbing nuisance. By understanding its causes and implementing the right solutions, such as installing plumbing shock arrestors or surge suppressor plumbing devices, you can effectively eliminate those jarring noises and protect your home’s plumbing. Prioritizing water hammer arrestor installation on appliances with rapid-closing valves is often the most direct and effective approach to reducing water hammer effect and enjoying a quieter home.
Frequently Asked Questions (FAQ)
Q1: Can I install a water hammer arrestor myself?
A1: Yes, in most cases, installing a water hammer arrestor is a manageable DIY project. It typically involves shutting off the water supply, draining the line, and screwing the arrestor onto the appropriate connection point before reattaching the appliance’s supply line. However, if you are uncomfortable with plumbing work or unsure about the process, it’s always best to consult a qualified plumber.
Q2: How many water hammer arrestors do I need?
A2: The number of arrestors you need depends on the number of appliances or fixtures causing the problem. Typically, an arrestor is recommended for each appliance with a quick-closing valve, such as washing machines, dishwashers, and ice makers. If you experience banging when closing faucets, arrestors can be installed there as well.
Q3: Are air chambers still effective for water hammer?
A3: Air chambers can be effective for mild cases of water hammer, but they are prone to “waterlogging” over time, losing their air cushion and becoming ineffective. Modern, sealed water hammer arrestors (like piston or diaphragm types) are generally considered more reliable and long-lasting solutions for preventing water hammer.
Q4: What is considered high water pressure in a home?
A4: Water pressure above 80 pounds per square inch (psi) is generally considered high for a residential plumbing system. High pressure can contribute to water hammer and can also stress your pipes, fixtures, and appliances, leading to premature wear and potential leaks. A pressure reducing valve (PRV) can be installed on the main water line to regulate this.
Q5: Can water hammer damage my pipes?
A5: Yes, persistent and severe water hammer can cause significant damage to your plumbing system. The repeated shock waves can loosen pipe supports, strain fittings, damage valve seats, and in extreme cases, lead to leaks or even burst pipes over time. It’s important to address water hammer to prevent potential costly repairs.