How to choose Pex-A EVOH Pipe?

When choosing PEX-A (cross-linked polyethylene) EVOH (ethylene vinyl alcohol) pipe, there are several factors to consider to ensure it meets your needs and requirements. Here's a guide to help you make an informed decision:

1. Size and Length: Determine the appropriate size and length of the PEX-A EVOH pipe for your specific application. Consider the pipe diameter (e.g., 1/2", 3/4", 1"), which is typically measured in inches. Additionally, determine the required length of the pipe to ensure it can reach the desired installation points without excessive joints or connections.

2. Pressure Rating: Check the pressure rating of the PEX-A EVOH pipe. This indicates the maximum pressure the pipe can handle without risk of failure. Ensure that the pressure rating of the pipe meets or exceeds the requirements of your application, whether it's for plumbing, radiant heating, or other systems.
   

3. Temperature Compatibility: Consider the temperature compatibility of the PEX-A EVOH pipe. Verify that it can withstand the temperature range required for your specific application. For example, if you are using the pipe for hot water systems, ensure it can handle the maximum temperature of the water without deformation or degradation.

4. Certification and Standards: Look for PEX-A EVOH pipe that has been certified and meets relevant industry standards, such as ASTM (American Society for Testing and Materials) standards. Certification ensures that the pipe has been tested for quality, durability, and compliance with specific requirements.

5. Oxygen Barrier: Consider the presence of an oxygen barrier in the EVOH layer of the pipe. The EVOH layer acts as a barrier to prevent oxygen ingress into the pipe, which is crucial for applications like radiant heating systems. An effective oxygen barrier helps minimize corrosion and extends the lifespan of the system.

6. Flexibility and Bend Radius: Evaluate the flexibility of the PEX-A EVOH pipe. PEX-A pipes are known for their excellent flexibility, which simplifies installation and allows for easier bending around obstacles. Check the recommended bend radius to ensure the pipe can be safely bent without damaging the integrity of the pipe.

7. Installation Method: Consider the installation method for the PEX-A EVOH pipe. PEX-A pipes can be joined using different methods, such as expansion fittings, crimp fittings, or push-fit fittings. Ensure that the chosen pipe is compatible with the installation method you plan to use and that the necessary fittings and tools are readily available.