What pressure and duration is required for pressure testing an assembled loop system before backfilling?

The correct choice of 100 psi for 15 minutes is consistent with the requirements established in the North Carolina Mechanical Code for pressure testing an assembled loop system before backfilling. This pressure and duration ensure that the system is adequately tested for leaks and structural integrity.

Testing at this pressure level is critical because it exceeds the normal operating pressures, allowing for the detection of potential weaknesses or failures in the system construction or components that might not be evident under standard conditions. The duration of 15 minutes provides sufficient time for any leaks to manifest, enhancing the reliability of the test results.

Understanding the importance of ensuring that an assembled loop system can withstand pressures beyond its normal operation is crucial for long-term system performance and safety. This choice reflects a balance between rigorous testing standards while being practical for implementation in typical mechanical installations.