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There was no associated test called out in the standard If the low air pressure alarm goes off within. This testing intends to hopefully identify leaks before they become a major problem.

If the low air alarm sounds before the 4 hours is up then the system fails the low air test With the system at normal system pressure, shut off the air source (compressor or shop air) for 4 hours 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.

Here is a breakdown of how the inspector conducts these tests

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.

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 Perform a pressure test at 40 psi (3.2 bar) for 2 hours

The system shall be permitted to lose up to 3 psi (0.2 bar) during the duration of the test

Air leaks shall be addressed if the system loses more than 3 psi (0.2 bar) during this test

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