Plan Review, Permits, and Field Inspection
This domain tests submittal completeness, review judgment, and the inspection sequence that keeps a job legal and buildable.
Working plan content
A complete submittal identifies the owner and contractor, the occupancy and commodity classification, ceiling and roof construction, pipe sizes and materials, sprinkler make, model, K-factor and temperature, hydraulic calculations, water supply data, hanger and seismic details, head count, and signage. Missing water supply data or an incomplete calculation is the most common cause of a review rejection.
Review judgment
Reviewers check storage clearance, deflector distances, obstruction rules, remote area and density, hose allowance, and whether special occupancies such as freezers, atriums, or high-piled storage have the right system type.
Inspection sequence
- Underground flush and hydrostatic test before connection.
- Rough-in inspection of piping, hangers, and bracing before concealment.
- Hydrostatic test at 200 psi for two hours, or 50 psi above working pressure where the working pressure exceeds 150 psi.
- Final inspection with flow test, alarm test, and dry pipe trip test where applicable.
Worked example
A system with a maximum working pressure of 175 psi is tested at 200 psi. The correct test is 225 psi for two hours, because the rule raises the test pressure above 200 psi when working pressure exceeds 150 psi. Testing at 200 psi would be rejected.
Traps
- Allowing insulation or ceiling installation before rough-in sign-off.
- Submitting hydraulic calculations that stop at the riser instead of the supply point.
- Failing to document the AHJ witness of the hydrostatic test and flow test.
- Forgetting the contractor's material and test certificate.