Pex Pipe Water Hammer Nightmare: How to Avoid This Plumbing Peril

Water hammer is a common plumbing issue that can cause loud banging noises in your pipes. It occurs when water flow is suddenly stopped, creating a pressure surge that reverberates through the plumbing system. While water hammer can occur in any type of pipe, it is often associated with PEX (cross-linked polyethylene) pipes due to their flexibility and elasticity. In this blog post, we will delve into the question of whether PEX pipe water hammer is a real concern and explore the causes, solutions, and preventive measures to mitigate this issue.

Understanding Water Hammer

Water hammer is a phenomenon that occurs when the flow of water is abruptly halted, causing a pressure spike that travels through the plumbing system. This pressure surge creates a shock wave that can damage pipes, fixtures, and appliances. The magnitude of water hammer depends on several factors, including the velocity of the water flow, the length and diameter of the pipes, and the presence of air chambers or other devices to absorb pressure changes.

PEX Pipe and Water Hammer

PEX pipes are becoming increasingly popular in plumbing due to their flexibility, durability, and corrosion resistance. However, their inherent elasticity can make them more susceptible to water hammer than rigid pipes such as copper or PVC. When water flow is suddenly stopped in a PEX pipe, the pipe can expand and contract, exacerbating the pressure surge and increasing the likelihood of water hammer.

Causes of Water Hammer in PEX Pipes

Several factors can contribute to water hammer in PEX pipes:

• Rapid Valve Closure: Abruptly closing faucets, valves, or appliances can cause a sudden stop in water flow, leading to water hammer.
• Long Pipe Runs: The longer the pipe run, the greater the potential for water hammer. This is because the pressure surge has more distance to travel and build up momentum.
• Lack of Air Chambers: Air chambers are devices installed in plumbing systems to absorb pressure surges and dampen water hammer. If air chambers are not properly sized or installed, they may not be effective in mitigating water hammer.
• Faulty Appliances: Malfunctioning appliances, such as washing machines or dishwashers, can create sudden changes in water flow, causing water hammer.

Solutions for PEX Pipe Water Hammer

There are several solutions to address water hammer in PEX pipes:

• Install Water Hammer Arrestors: Water hammer arrestors are devices that absorb pressure surges and prevent them from damaging the plumbing system. They can be installed at the point of use, such as near faucets or appliances, or at the main water supply line.
• Use Slow-Closing Valves: Slow-closing valves gradually restrict water flow, reducing the pressure surge and minimizing water hammer.
• Install Air Chambers: Air chambers provide a cushion of air to absorb pressure surges and dampen water hammer. They should be installed at the highest point in the plumbing system and properly sized for the pipe diameter and length.
• Use Insulated Pipes: Insulated pipes reduce heat loss and prevent rapid expansion and contraction of PEX pipes, which can contribute to water hammer.

Preventive Measures for PEX Pipe Water Hammer

In addition to the solutions mentioned above, there are preventive measures you can take to minimize the risk of water hammer in PEX pipes:

• Avoid Rapid Valve Closure: Close faucets, valves, and appliances slowly to prevent sudden stops in water flow.
• Install Flexible Connectors: Flexible connectors between appliances and plumbing fixtures can absorb some of the pressure surge and reduce water hammer.
• Maintain Appliances Properly: Ensure that appliances are functioning correctly and do not create sudden changes in water flow.
• Consider Pipe Sizing: Use appropriately sized pipes for the water flow rate and pressure in your system. Oversized pipes can increase the likelihood of water hammer.

Takeaways: Addressing PEX Pipe Water Hammer

Water hammer is a common plumbing issue that can occur in any type of pipe, including PEX pipes. While PEX pipes are flexible and durable, their elasticity can make them more susceptible to water hammer than rigid pipes. By understanding the causes of water hammer and implementing the solutions and preventive measures discussed in this blog post, you can effectively mitigate this issue and protect your plumbing system from damage.

Questions We Hear a Lot

1. Are PEX pipes more prone to water hammer than copper pipes?

Yes, PEX pipes are generally more susceptible to water hammer due to their flexibility and elasticity.

2. Can water hammer damage PEX pipes?

Yes, severe water hammer can damage PEX pipes, causing leaks or bursts.

3. How can I tell if I have water hammer in my PEX pipes?

Listen for loud banging or knocking noises in your pipes when faucets or appliances are turned off.

4. Can I install water hammer arrestors myself?

While it is possible to install water hammer arrestors yourself, it is recommended to consult with a licensed plumber to ensure proper installation.

5. How often should I inspect my plumbing system for water hammer?

Regularly inspect your plumbing system for any signs of water hammer, such as leaks, banging noises, or loose fittings.