What generally indicates a successful pressure test in a gas piping system?

A successful pressure test in a gas piping system is indicated by consistent pressure levels. This consistency shows that the system is holding the pressure over time without any significant drops, which would suggest leaks or weaknesses in the piping. During a pressure test, the system is pressurized to a predetermined level, and if the pressure remains stable without any loss, it confirms that the integrity of the piping is intact and that there are no leaks.

The other options do not directly correlate with a pressure test's success. Increased temperature is not a reliable measure of system integrity; it could indicate other issues or variable conditions. Reduced flow rate can occur due to various reasons but does not necessarily reflect the integrity of the pressure test. Decreased volume might indicate a leak or other problems, which would be counter to what is desired in a successful pressure test. Thus, consistent pressure levels are the key indicator of proper sealing and soundness of the gas piping system during testing.