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There was no associated test called out in the standard The required frequency for fire sprinkler system testing or. This testing intends to hopefully identify leaks before they become a major problem.
Here is a breakdown of how the inspector conducts these tests The system shall be left with pressurized water long enough for leaks (if any) to be determined. Partial flow trip test throttle the sprinkler control valve to within 2.5 turns of being fully closed
Open the inspectors test connection to release air pressure from the system
Record the time and air pressure at which the system trips Compare the results with the previous tests and take appropriate corrective action if the. Learn about dry sprinkler tests with the longest timelines, including testing air leakage, gauges, the inside of water tanks, and dry sprinkler heads. If the low air alarm sounds before the 4 hours is up then the system fails the low air test
A failure of either the 2 hour or 4 hour test will result in the need to address gas leaks which is a separate inspection and repair procedure. Model air pressure at start of test At 40 psi without pressure leakage exceeding 3 psi System pressure at 40 psi, leakage exceeded 3 psi, system has low air supervision
Nfpa 25 2007 13.4.4.2.9 dry pipe systems shall be tested once every three years for air leakage, using one of the following test methods
(1) a pressure test at 40 psi for 2 hours The system shall be permitted to lose up to 3 psi during the duration of the test Air leaks shall be addressed if the system loses more than 3 psi during this test. It helps to identify any potential issues with the dry pipe valve or the water supply, which could prevent the sprinkler system from operating correctly in the event of a fire.
Every three years and whenever the system is altered, the dry pipe valve or preaction valve shall be trip tested with the valve fully open and the quick opening device, if provided, in service
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