Arizona Plumbing Practice Exam

The correct test duration for gas lines under low pressure is 1 1/2 hours. This duration is established to ensure that any leaks in the gas line can be detected effectively and accurately. Testing for this length of time allows for sufficient observation, ensuring that pressure remains stable throughout the test period. If there are any leaks, they will typically manifest as a pressure drop within this timeframe, enabling the inspector to identify and rectify the issue before the gas system is put into operation.

Longer test durations, such as 2 hours, may be unnecessary for low-pressure testing and could lead to inefficiencies in the inspection process. Similarly, testing for shorter durations might not provide an adequate window to locate any potential leaks, making 1 1/2 hours the optimal testing time for reliability and thoroughness.