Sprinkler Repair Air Leak and Full Flow Trip Test (Dry System) At a recent inspection, it was noted that there is no record of air leak testing or a full flow trip test having been performed on your dry sprinkler system in the last three years. Per NFPA 25 13.4.4.2.2.2*Every 3 years and whenever the system is altered, the dry pipe valve shall be trip tested with the control valve fully open and the quick-opening device, if provided, in service. And per NFPA 25 13.4.4.2.9Dry pipe systems shall be tested once every 3 years for air leakage, using one of the following test methods: (1) A pressure test at 40 psi (3.2 bar) shall be performed for 2 hours. (a) The system shall be permitted to lose up to 3 psi (0.2 bar) during the duration of the test. (b) Air leaks shall be addressed if the system loses more than 3 psi (0.2 bar) during this test.Nelbud proposes to perform the required air leak testing and full flow trip test of your dry fire sprinkler system. Dry Sprinkler Head Sampling