The game-changer: pex pipe’s potential in air line systems

PEX (cross-linked polyethylene) pipes are commonly used in plumbing for water distribution. However, their use in compressed air systems raises questions about their suitability and safety. This comprehensive guide will explore the feasibility of using PEX pipe for air lines, covering its advantages, limitations, and proper installation practices.

Advantages of Using PEX Pipe for Air Lines

• Flexibility: PEX pipes are highly flexible, making them easy to bend and route around obstacles. This flexibility simplifies installation and allows for complex layouts.
• Corrosion Resistance: PEX pipes are resistant to corrosion and rust, ensuring long-term durability and reliability in air lines.
• Lightweight: PEX pipes are lightweight, making them easier to handle and install compared to heavier metal pipes.
• Cost-Effective: PEX pipes are generally more cost-effective than metal pipes, making them an economical choice for air line installations.

Limitations of Using PEX Pipe for Air Lines

• Pressure Limitations: PEX pipes have a lower pressure rating compared to metal pipes. While some PEX pipes can withstand up to 100 psi, they may not be suitable for high-pressure air lines.
• Temperature Sensitivity: PEX pipes can soften and deform at elevated temperatures. Therefore, they should not be used in air lines that carry hot air or are exposed to extreme heat.
• Permeability to Gases: PEX pipes are slightly permeable to gases, including oxygen. This permeability can lead to oxidation of metal components in the air line system over time.

Proper Installation Practices for PEX Pipe Air Lines

• Use Oxygen Barrier PEX: Oxygen barrier PEX pipes have an additional layer that prevents oxygen permeation, reducing the risk of oxidation.
• Use Proper Fittings: Use fittings designed specifically for PEX pipes to ensure a secure and leak-proof connection.
• Follow Manufacturer’s Guidelines: Adhere to the manufacturer’s instructions for proper installation, including pressure and temperature ratings.
• Avoid Direct Sunlight: PEX pipes should be protected from direct sunlight, as UV exposure can degrade the material.
• Consider Pressure Relief Devices: Install pressure relief devices to prevent over-pressurization and potential pipe failure.

Other Considerations for Using PEX Pipe for Air Lines

• Applications: PEX pipe air lines are suitable for low-pressure applications such as pneumatic tools, air compressors, and air brakes.
• Maintenance: Regularly inspect and maintain PEX pipe air lines to ensure their integrity and prevent potential leaks.
• Safety: Always follow proper safety precautions when working with compressed air systems, including using appropriate tools and personal protective equipment.

Alternatives to PEX Pipe for Air Lines

If PEX pipe is not suitable for a particular air line application due to pressure or temperature requirements, consider the following alternatives:

• Copper Pipes: Copper pipes are durable, have high pressure ratings, and are resistant to corrosion.
• Stainless Steel Pipes: Stainless steel pipes offer excellent corrosion resistance and can withstand high pressures.
• Galvanized Steel Pipes: Galvanized steel pipes are cost-effective and provide good corrosion protection.

Beyond Conclusion: Exploring Additional Aspects

• Impact of Humidity: PEX pipes can absorb moisture from the air, which can potentially lead to swelling and reduced strength. Consider using moisture-resistant insulation or desiccant dryers to mitigate this issue.
• Chemical Compatibility: PEX pipes are compatible with most common gases used in air lines, but it is essential to consult the manufacturer’s specifications to ensure compatibility with specific chemicals or oils.
• Long-Term Performance: PEX pipes have a long service life, but their actual lifespan depends on the operating conditions and maintenance practices.

Answers to Your Most Common Questions

• Can PEX pipe be used for high-pressure air lines?

No, PEX pipes typically have a lower pressure rating than metal pipes and are not suitable for high-pressure air lines.

• Is PEX pipe resistant to corrosion?

Yes, PEX pipes are highly resistant to corrosion and rust, making them a durable choice for air lines.

• Can PEX pipe be used outdoors?

PEX pipes should be protected from direct sunlight, but they can be used outdoors with proper insulation and UV protection.