Pex should be tested under pressure not to exceed how many pounds per square inch, minimum?

Pex piping is commonly used in various plumbing applications due to its flexibility, resistance to scale and chlorine, reduced water hammer, and lower shipping costs. However, it's crucial to perform pressure testing to ensure the integrity of the system before it is put into regular use.

The proper testing pressure for Pex is 40 pounds per square inch. This testing pressure ensures that any potential leaks can be detected while avoiding excessive stress on the material, which could lead to damage or failure. Testing at this specified pressure provides a good balance—sufficient to check for leaks without exceeding the ratings of the material, helping to confirm the appropriate performance of the system under typical operational conditions.

Testing at pressures below this level may not effectively simulate real-world conditions that the Pex will face after installation, while testing at pressures above this limit could compromise the integrity of the piping. Therefore, using a testing pressure of 40 pounds per square inch aligns with industry standards and the manufacturer’s guidelines for proper installation and safety.