How to prevent water hammer in water pex pipe?

Water hammer is a common and potentially damaging phenomenon in plumbing systems, especially those using PEX (Cross-linked Polyethylene) pipes. As a reputable water PEX pipe supplier, I understand the importance of preventing water hammer to ensure the longevity and efficiency of plumbing systems. In this blog, I'll share some effective strategies to prevent water hammer in water PEX pipes.

Understanding Water Hammer

Before delving into prevention methods, it's crucial to understand what water hammer is. Water hammer occurs when the flow of water in a pipe is suddenly stopped or changed direction. This abrupt change creates a pressure wave that travels through the pipe, causing a loud banging or knocking sound. Over time, these pressure waves can damage pipes, fittings, and valves, leading to leaks and other plumbing issues.

There are several factors that can contribute to water hammer, including:

• Rapid valve closure: When a valve is closed too quickly, the water flowing through the pipe is suddenly halted, creating a pressure wave.
• High water velocity: If water is flowing through the pipe at a high speed, it can create more force when it is suddenly stopped, increasing the likelihood of water hammer.
• Inadequate pipe support: Pipes that are not properly supported can move or vibrate when water hammer occurs, exacerbating the problem.

Preventive Measures

1. Install Water Hammer Arrestors

Water hammer arrestors are devices designed to absorb the pressure waves created by water hammer. They work by providing a cushion of air or a flexible diaphragm that compresses when the pressure wave hits, reducing the impact on the pipes and fittings.

There are two main types of water hammer arrestors:

• Piston-type arrestors: These arrestors use a piston to compress a spring or a cushion of air when the pressure wave hits. They are typically installed near the valve or fixture where the water flow is controlled.
• Diaphragm-type arrestors: These arrestors use a flexible diaphragm to absorb the pressure wave. They are often installed directly on the pipe and are suitable for both residential and commercial applications.

As a water PEX pipe supplier, I can recommend high-quality water hammer arrestors that are compatible with PEX pipes. You can find more information about our products on our website.

2. Use Slow-Closing Valves

One of the most effective ways to prevent water hammer is to use slow-closing valves. These valves are designed to close gradually, allowing the water flow to slow down gradually rather than suddenly stopping. This reduces the force of the pressure wave and minimizes the risk of water hammer.

Slow-closing valves are available in various types, including ball valves, gate valves, and check valves. They can be installed at the main water supply line or at individual fixtures, depending on the specific needs of your plumbing system.

When selecting slow-closing valves, it's important to choose valves that are compatible with PEX pipes. Look for valves that are specifically designed for use with PEX pipes and have the appropriate pressure and temperature ratings.

3. Reduce Water Velocity

High water velocity is a common cause of water hammer. To reduce water velocity, you can:

• Increase pipe diameter: Using larger diameter pipes can reduce the water velocity and minimize the risk of water hammer. However, this may not be practical in all situations, especially in existing plumbing systems.
• Install flow restrictors: Flow restrictors are devices that limit the amount of water flowing through a pipe. They can be installed at individual fixtures or at the main water supply line to reduce the water velocity.
• Adjust the water pressure: High water pressure can also contribute to high water velocity. You can adjust the water pressure using a pressure regulator to ensure that it is within the recommended range for your plumbing system.

4. Provide Adequate Pipe Support

Proper pipe support is essential to prevent water hammer. Pipes that are not properly supported can move or vibrate when water hammer occurs, which can damage the pipes and fittings.

To provide adequate pipe support, you can:

• Use pipe hangers and brackets: Pipe hangers and brackets are used to secure the pipes to the wall or ceiling. Make sure to use hangers and brackets that are suitable for the size and type of pipes you are using.
• Install expansion loops: Expansion loops are used to allow the pipes to expand and contract as the temperature changes. This helps to prevent stress on the pipes and reduces the risk of water hammer.
• Avoid sharp bends and elbows: Sharp bends and elbows in the pipes can increase the water velocity and create turbulence, which can contribute to water hammer. Try to use gentle curves and smooth fittings whenever possible.

5. Use PEX Pipes with High Flexibility

PEX pipes are known for their flexibility, which can help to absorb the pressure waves created by water hammer. When selecting PEX pipes, look for pipes that have a high degree of flexibility and are designed to withstand the pressure and temperature conditions of your plumbing system.

PEX Pipe for Floor Heating is a popular choice for many plumbing applications, including floor heating systems. These pipes are made from high-quality PEX material and are designed to provide excellent flexibility and durability.

PE-Xa Pipe for Plumbing Pipe is another type of PEX pipe that is commonly used in plumbing systems. It has a high resistance to stress cracking and is suitable for both hot and cold water applications.

6. Install Ppsu Elbow 90°

Ppsu (Polyphenylsulfone) elbows are a type of fitting that can be used to connect PEX pipes at a 90-degree angle. These elbows are made from a strong and durable material that can withstand the pressure and temperature conditions of your plumbing system.

Using Ppsu Elbow 90° can help to reduce the water velocity and minimize the risk of water hammer. They are also easy to install and can be used in a variety of plumbing applications.

Conclusion

Preventing water hammer in water PEX pipes is essential to ensure the longevity and efficiency of your plumbing system. By following the preventive measures outlined in this blog, you can minimize the risk of water hammer and avoid costly repairs and replacements.

As a water PEX pipe supplier, I am committed to providing high-quality products and expert advice to help you prevent water hammer and maintain a reliable plumbing system. If you have any questions or need further assistance, please don't hesitate to contact me. I look forward to discussing your plumbing needs and helping you find the best solutions for your project.

References

• "Plumbing Engineering Design Handbook," by the American Society of Plumbing Engineers.
• "Residential Plumbing Systems: Design and Installation," by the National Association of Home Builders.
• "PEX Pipe Installation Guide," by the Plastic Pipe and Fittings Association.