How long should the air pressure leakage test be conducted for automatic dry and semiautomatic systems?

How long should the air pressure leakage test be conducted for automatic dry and semiautomatic systems?

• A. 6 hours
• B. 12 hours
• C. 24 hours
• D. 48 hours

Answer: (C)

Air leakage testing is used to verify the airtight integrity of dry standpipe systems after installation, ensuring there are no slow leaks in pipes, fittings, or joints that could compromise performance. For automatic dry and semiautomatic systems, the standard requires the test to be conducted for a full 24-hour period. This length of time gives a reliable window to reveal slow or hidden leaks that might not show up in a shorter test, while remaining practical for job sites. If the system holds the test pressure over the 24 hours without an unacceptable drop, the system is considered leak-free for acceptance. Shorter durations, like 6 or 12 hours, may miss gradual losses, while longer durations, such as 48 hours, are not required by the standard.

Air leakage testing is used to verify the airtight integrity of dry standpipe systems after installation, ensuring there are no slow leaks in pipes, fittings, or joints that could compromise performance. For automatic dry and semiautomatic systems, the standard requires the test to be conducted for a full 24-hour period. This length of time gives a reliable window to reveal slow or hidden leaks that might not show up in a shorter test, while remaining practical for job sites. If the system holds the test pressure over the 24 hours without an unacceptable drop, the system is considered leak-free for acceptance. Shorter durations, like 6 or 12 hours, may miss gradual losses, while longer durations, such as 48 hours, are not required by the standard.