Pex Water Hammer Arrestors: A DIY Guide to Preventing Burst Pipes
What To Know
- In PEX piping, the flexible nature of the material allows it to expand and contract more easily than rigid pipes, making it more susceptible to water hammer.
- Install the arrestor as close as possible to the source of the water hammer, typically at the end of a long pipe run or near a fast-closing valve.
- Can I use a water hammer arrestor on a non-PEX plumbing system.
Water hammer, a sudden surge of pressure in plumbing systems, can cause damaging vibrations and noises. While water hammer can occur in any plumbing system, it’s particularly concerning in PEX (cross-linked polyethylene) piping. This blog post delves into the question: does PEX need a water hammer arrestor? We’ll explore the factors that influence the need for water hammer arrestors, their benefits, and the best practices for installation.
What Causes Water Hammer in PEX Piping?
Water hammer occurs when a fast-flowing stream of water is suddenly stopped. This can happen when a faucet or valve is closed abruptly, creating a pressure surge that travels through the plumbing system. In PEX piping, the flexible nature of the material allows it to expand and contract more easily than rigid pipes, making it more susceptible to water hammer.
Benefits of Water Hammer Arrestors
Installing water hammer arrestors in PEX piping offers several benefits:
- Reduced Vibration and Noise: Water hammer arrestors absorb the pressure surge, preventing the vibrations and noise that can damage pipes and appliances.
- Increased Pipe Longevity: Excessive water hammer can weaken PEX pipes over time, causing leaks and failures. Water hammer arrestors protect the piping system, extending its lifespan.
- Protection of Appliances: Water hammer can damage washing machines, dishwashers, and other appliances connected to the plumbing system. Water hammer arrestors prevent these expensive repairs.
When is a Water Hammer Arrestor Necessary for PEX?
The need for a water hammer arrestor in PEX piping depends on several factors:
- Length of Pipe Run: Longer pipe runs create a greater potential for water hammer.
- Flow Rate: High flow rates through the system increase the likelihood of water hammer.
- Presence of Valves and Fixtures: Fast-closing valves and fixtures, such as solenoid valves and quick-closing faucets, can trigger water hammer.
- Pipe Material: PEX piping is more flexible than rigid pipes, making it more susceptible to water hammer.
Best Practices for Water Hammer Arrestor Installation
If a water hammer arrestor is deemed necessary, it should be installed correctly to ensure its effectiveness:
- Location: Install the arrestor as close as possible to the source of the water hammer, typically at the end of a long pipe run or near a fast-closing valve.
- Orientation: The arrestor should be installed vertically, with the air chamber at the top.
- Size: Choose an arrestor with the appropriate size and pressure rating for the plumbing system.
Types of Water Hammer Arrestors
There are two main types of water hammer arrestors:
- Air Chamber Arrestors: These arrestors use an air chamber to absorb the pressure surge. They are typically installed on horizontal pipe runs.
- Spring-Loaded Arrestors: These arrestors use a spring to absorb the pressure surge. They are typically installed on vertical pipe runs.
Conclusion: Protecting PEX from Water Hammer
Whether or not PEX piping needs a water hammer arrestor depends on the specific system configuration and usage patterns. By understanding the factors that influence water hammer, considering the benefits of arrestors, and following best practices for installation, you can effectively protect your PEX plumbing system from damaging pressure surges.
FAQ
Q: How can I tell if I have water hammer in my PEX piping?
A: Listen for banging or vibrating sounds when faucets or valves are closed abruptly.
Q: Can I install a water hammer arrestor myself?
A: Yes, but it’s recommended to consult a licensed plumber for proper installation and sizing.
Q: How often should I inspect my water hammer arrestor?
A: Inspect the arrestor annually and replace it if it’s showing signs of wear or damage.
Q: Are water hammer arrestors expensive?
A: The cost of water hammer arrestors varies depending on the type and size, but they are generally affordable and provide long-term protection.
Q: Can I use a water hammer arrestor on a non-PEX plumbing system?
A: Yes, water hammer arrestors can be used on any type of plumbing system to prevent pressure surges.
