What is the maximum allowable air leakage for dry systems per week?

In dry sprinkler systems, maintaining proper air pressure is crucial for functionality and safety. The maximum allowable air leakage for dry systems is set to ensure that the system can operate effectively without compromising the integrity of the piping and connections. The standard indicates that a system should not lose more than 1.5 psi in a 24-hour period, which translates to a maximum allowable leakage of 10.5 psi over a week. This limit helps ensure that any pressure drops are identified and addressed promptly, maintaining the reliability of the fire suppression system. By adhering to this standard, sprinkler fitters ensure that dry systems remain ready for immediate deployment should a fire occur. This is critical for the system's performance and efficacy in providing the necessary fire protection.