Fire Sprinkler System Inspection Requests and Field Inspections
Domain overview
Inspection Requests and Field Inspections tests whether you request the right inspection at the right stage, witness and document the required tests, and close the project without punch-list surprises.
Milestones
- Underground: before backfill, after flushing in accordance with NFPA 24, with the contractor's underground test certificate.
- Rough-in: before concealment; hydrostatic test at 200 psi for 2 hours, or 50 psi above the maximum static pressure where that is greater, using calibrated gauges and isolating alarm devices not rated for the test pressure.
- Final acceptance: main drain flow, waterflow alarm, valve tamper, dry-pipe trip test, fire pump test per NFPA 20, and the contractor's material and test certificate for aboveground piping.
Making the request
The licensed contractor requests inspection from the AHJ or State Fire Marshal with the permit number, address, scope, and test type. The system must be complete and accessible, and a qualified representative must be on site with gauges, test valves, and the certificates. Give the notice the AHJ requires and never cover piping before it has been inspected.
Worked example
A dry-pipe warehouse system is ready for its trip test. Verify air pressure and the dry valve, open the test valve, and record the time for water to reach the inspector's test connection and for the alarm to sound. Then perform the main drain test and record static and residual pressures for comparison with the original flow test.
Traps
- Hydrostatic testing with alarm devices connected, which can damage them.
- Gauges out of calibration or poorly scaled for the test pressure.
- Final inspection with no spare head cabinet, signage, or owner's information for 13D/13R systems.
- Test certificates unsigned or missing when the inspector arrives.