If you’re considering using PEX (cross-linked polyethylene) pipes for your air lines, it’s important to know that PEX is not designed for compressed air applications.
While PEX is a versatile material commonly used in plumbing systems, its specifications do not align with the requirements for handling compressed air.
One of the well-known manufacturers of PEX products, Sharkbite, explicitly addresses this question, providing clear guidance on the intended use of PEX pipes.
According to Sharkbite, a leading manufacturer of PEX products, using PEX pipes for compressed air applications is not recommended.
The company explicitly states that PEX pipe is not intended for such use. It’s crucial to adhere to the manufacturer’s guidelines to ensure the safety and efficiency of your system.
If you’re looking for materials suitable for compressed air lines, it’s advisable to explore alternatives that meet the specific requirements of this application.
That being said, PEX is used by a lot of people. Even though it is not specifically rated for air, it does the job well and is neither brittle nor unsafe like PVC.
How Come People Still Use PEX For Airlines?
Most PEX pipes do not explicitly state that they can be used with compressed air, but a few do.
Still, the use of PEX (cross-linked polyethylene) for airlines is not recommended by manufacturers and industry experts.
However, some individuals may still choose to use PEX for compressed air applications due to several reasons, often stemming from a lack of awareness or misunderstanding of the potential risks and limitations.
Uninformed Decision:
People may not be aware of the specific guidelines provided by PEX manufacturers regarding the unsuitability of PEX for compressed air.
In such cases, individuals might unknowingly use PEX, assuming it can handle various applications, including compressed air.
Cost Considerations:
PEX is known for being a cost-effective plumbing material, and individuals might be tempted to use it for compressed air systems to save on expenses.
However, the upfront cost savings may be outweighed by the risks associated with using an unsuitable material.
Availability and Convenience:
PEX is widely available in hardware stores, making it easily accessible for individuals working on DIY projects or small-scale applications.
The convenience of acquiring PEX may lead some to use it for purposes other than its intended application.
Despite these factors, it’s essential to emphasize that using PEX for compressed air can pose serious safety risks.
How Much Air PSI Can PEX Handle?
PEX tubing is a popular choice for plumbing and heating systems. The pressure rating of PEX tubing depends on the temperature of the water or air flowing through it.
Most PEX tubing sold in the US has a standard hydrostatic pressure rating of 160 psi at 73°F. However, it can withstand pressures up to around 800 psi before actually bursting or cracking.
Can PEX Be Used For HVAC?
Yes, PEX tubing can be used for HVAC systems. PEX tubing is a flexible and durable material that can withstand high temperatures and pressures.
It is also resistant to corrosion and scale buildup, making it a great choice for HVAC systems.
PEX tubing is commonly used in radiant heating systems, which are a type of HVAC system that uses hot water to heat the floors or walls of a building.
PEX tubing is also used in forced-air heating and cooling systems, which use air to distribute heat or cool air throughout a building.
What Pipe Can Be Used For Air Lines?
There are several types of pipes that can be used for air lines. The most common materials used for piped air line systems are:
Aluminum: Aluminum pipes are corrosion-resistant and have a smooth bore, which makes them energy-efficient. They are available in sizes up to 8 inches in diameter and are great for all facilities.
Galvanized carbon steel: Galvanized carbon steel pipes are available in multiple sizes and have moderate material costs. They offer some rust protection but may rust at joints and leak. The rough inside promotes contaminant build-up and creates pressure drop.
Stainless steel: Stainless steel pipes have a smooth interior and low pressure drop, but they are labor-intensive to install and expensive.
Copper: Copper pipes have no rust and good air quality, but they require quality brazing to prevent leaks. They are susceptible to thermal cycling, and installation requires an open flame.
It’s important to note that PVC pipes should not be used for air lines as they can shatter and send pieces flying like shrapnel if they break under pressure.
Can SharkBite Be Used For Air?
Yes, SharkBite provides push-fit solutions for air and pneumatics that can be used for compressed air installations.
SharkBite’s push-fit connection technology allows for rapid assembly and configuration, eliminating the need for tools, threaded pipes, solvent or glue.
The SharkBite Air & Pneumatics range has been designed to provide a single solution for all commonly available pipes for small to large commercial and industrial applications.
Final Words
PEX is not designed to withstand the pressures and conditions associated with compressed air systems, and its use in such applications may result in pipe failure, leaks, and potential safety hazards.
It is always recommended to follow manufacturer guidelines and choose materials specifically designed for the intended purpose to ensure the reliability and safety of the system.
