During air leakage tests of pre-action systems at 40 psi, allowable loss is up to how many psi?

• A. 1 psi
• B. 5 psi
• C. 3 psi
• D. 7 psi

Answer: (C)

Air leakage testing at 40 psi is about confirming the piping and fittings in a pre-action system are airtight. The test measures how much pressure the system loses during the test period. The allowable loss is 3 psi because this amount accounts for small, acceptable leaks from fittings and components while still ensuring the system remains effectively tight. If the pressure drops more than 3 psi, it indicates leaks that need to be repaired before the system passes the test. Values like 1 psi are too strict for field conditions, while 5 psi or 7 psi show leaks beyond what the standard permits.