What is the MINIMUM test duration of a gas piping system with 1

This choice refers to a measurement of pipe volume, which does not directly indicate test duration. The minimum test duration is not determined by the volume of the piping system but rather by regulatory standards that specify a fixed time for testing.

While 1 hour may seem sufficient for testing purposes, it falls short of the required minimum duration. The standard specifies that a gas piping system must be tested for at least 1 1/2 hours to ensure thorough inspection and safety against leaks.

This option exceeds the necessary testing duration. Although extended testing might seem more thorough, the minimum requirement is set at 1 1/2 hours. Testing for 12 hours is unnecessary and could lead to inefficiencies without improving safety.

Similar to the previous choice, a 24-hour test duration is excessively long. The regulation specifies a minimum of only 1 1/2 hours, and longer durations do not provide additional benefits in safety verification for gas piping systems.