According to the NFPA 54 guidelines, what should not occur during a pressure drop test?

According to NFPA 54 guidelines, the pressure drop test is a critical procedure used to determine the integrity of the gas piping system. A discernible drop in pressure indicates that there is a leak or a problem within the system that needs to be addressed.

During this test, the pressure should remain stable; otherwise, it signifies that the system is compromised. Thus, if there is a measurable drop within the first three minutes, it suggests that the system is not functioning as required and poses a safety risk.

The proper functioning of the gas supply system is paramount for safety and efficiency, which is why this particular issue is emphasized in the context of the NFPA guidelines. Other scenarios, such as air leaks around the thermostat, overheating of the system, or fluctuations in gas supply, may indicate various operational issues but are not specifically related to the immediate requirements of the pressure drop test as outlined in NFPA 54.