Unleash the Power of PEX: Can You Use It for Compressed Air Systems?

Polyethylene cross-linked (PEX) pipes have gained immense popularity in plumbing systems due to their flexibility, durability, and corrosion resistance. However, their suitability for compressed air applications has raised questions among users. This blog post will delve into the intricacies of using PEX pipe for compressed air, providing a comprehensive understanding of its capabilities and limitations.

Understanding PEX Pipe

PEX pipes are made from polyethylene, a thermoplastic material that is cross-linked to enhance its strength and durability. The cross-linking process creates a molecular network that improves the pipe’s resistance to heat, pressure, and chemicals.

Compressed Air Requirements

Compressed air systems typically require pipes that can withstand high pressures, ranging from 90 to 150 psi. Additionally, the pipes must be resistant to the corrosive effects of moisture and oil that may be present in the air.

PEX Pipe for Compressed Air

Advantages:

• Flexibility: PEX pipes are highly flexible, making them easy to maneuver and install, even in tight spaces or around obstacles.
• Corrosion Resistance: PEX pipes are highly resistant to corrosion caused by moisture and oil, making them suitable for compressed air applications.
• Durability: PEX pipes have a long lifespan and can withstand high pressures and temperatures.

Limitations:

• Pressure Rating: The pressure rating of PEX pipes is generally lower than that of metal pipes, limiting their use in high-pressure compressed air systems.
• Temperature Range: PEX pipes have a maximum temperature rating of 180°F (82°C), which may not be sufficient for certain compressed air applications.

Choosing the Right PEX Pipe

When selecting PEX pipe for compressed air applications, consider the following factors:

• Pressure Rating: Choose PEX pipes with a pressure rating that meets or exceeds the maximum operating pressure of the compressed air system.
• Temperature Range: Ensure the PEX pipe’s maximum temperature rating aligns with the expected operating temperatures of the compressed air system.
• Size: Determine the appropriate pipe size based on the flow rate and pressure of the compressed air system.

Installation Considerations

• Use Reinforced PEX: For compressed air applications, it is recommended to use reinforced PEX pipes, which have an additional layer of aluminum or fiberglass to enhance their strength and pressure resistance.
• Secure Connections: Use appropriate fittings and clamps to ensure secure connections between PEX pipes and other components.
• Avoid Kinking: Avoid kinking PEX pipes during installation, as this can weaken the pipe and compromise its performance.

Alternatives to PEX Pipe

For compressed air systems that require higher pressures or temperatures, alternative piping materials may be more suitable, such as:

• Copper Pipes: Copper pipes have excellent pressure and temperature resistance, making them suitable for high-pressure compressed air applications.
• Steel Pipes: Steel pipes offer superior strength and durability, making them ideal for extreme pressure and temperature conditions.
• PVC Pipes: PVC pipes are corrosion-resistant and cost-effective, but have lower pressure and temperature ratings compared to metal pipes.

Final Thoughts: Weighing the Pros and Cons

While PEX pipes can be used for compressed air applications in certain conditions, it is essential to carefully consider the limitations and potential risks. For high-pressure or high-temperature systems, alternative piping materials may be more appropriate. By understanding the specific requirements of the compressed air system and choosing the right materials and installation practices, you can ensure a safe and efficient operation.

Basics You Wanted To Know

Q: Can PEX pipe be used for all compressed air applications?
A: No, PEX pipe may not be suitable for high-pressure or high-temperature compressed air systems.

Q: What is the maximum pressure rating for PEX pipes used for compressed air?
A: The pressure rating varies depending on the type of PEX pipe. Consult the manufacturer’s specifications for the specific product.

Q: Is reinforced PEX pipe necessary for compressed air applications?
A: Yes, it is recommended to use reinforced PEX pipes for compressed air applications to enhance their strength and pressure resistance.

Q: Can PEX pipe be used to connect a compressor to a tool?
A: Yes, PEX pipe can be used for short runs to connect a compressor to a tool, but it is important to ensure the pipe is rated for the pressure and temperature of the system.

Q: How do I avoid kinking PEX pipe during installation?
A: Use a bending spring or other tools to carefully guide the pipe around obstacles without creating sharp bends.