For how long should a hydronic system be pressure tested?

In pressure testing a hydronic system, the correct duration and pressure are crucial to ensure the integrity and functionality of the system. A pressure test typically involves applying a pressure greater than the normal operating pressure of the system to check for leaks or weaknesses in the components.

Testing for 2 hours at 100 psig provides ample time to allow for the detection of any potential leaks or issues that might arise under high-pressure conditions that exceed typical operating pressure. This duration is generally accepted as sufficient for the materials and construction of hydronic systems to stabilize under pressure, which helps in identifying any faults that may not be immediately evident.

Moreover, maintaining the test at a pressure of 100 psig ensures that the system is evaluated under a significant stress level, reflective of potential operating conditions. This practice is essential for ensuring the durability and safety of the hydronic system once it is operational.

In contrast, shorter testing periods or lower pressures may not provide a complete assessment of the system's integrity, as there may not be enough time for issues to surface or the pressure might not be representative of worst-case scenarios the system could encounter.