Plan Review and Field Inspection Procedures
Domain 7: Plan Review and Field Inspection Procedures
This domain tests the sequence from submittal to acceptance. A plan review checks design basis, hydraulic calculations, and coordination; a field inspection checks that installed work matches approved plans and passes acceptance tests.
Core rules
- Submittals should include occupancy hazard, design density/area, hydraulic calculations, water-supply data, pipe sizes, sprinkler locations, and hanger details.
- Hydrostatic testing is commonly 200 psi for two hours; where working pressure exceeds 150 psi, test at 50 psi above working pressure.
- Underground mains require flushing before connection; aboveground piping requires flushing after installation.
- Acceptance includes alarm tests, main drain test, and verification that sprinklers and piping match approved submittals.
Worked example
A system has a working pressure of 175 psi. Because that exceeds 150 psi, the hydrostatic test pressure is 175 + 50 = 225 psi, held for two hours. Using 200 psi would be below the required test pressure. The reasoning: the 200 psi default applies only while working pressure is 150 psi or less.
Traps
- Approving a submittal without hydraulic calculations.
- Accepting manufacturer cut sheets as a substitute for project-specific calculations.
- Missing underground flushing before tie-in.
- Failing to compare installed sprinkler temperature ratings with approved plans.