Plan Review, Permitting, and Inspection Procedures
Plan Review Process
Before installation, submit plans to the local authority having jurisdiction (AHJ). Plans must include hydraulic calculations, sprinkler layout, pipe sizing, water supply data, and manufacturer cut sheets. The AHJ reviews for code compliance and issues permits. Know that plan review is not a substitute for field inspection-both are required.
Permitting Essentials
Permits are required for new installations, alterations, and additions. The permit application must identify the scope, occupancy, and contractor. Fees are typically based on system size or valuation. Work cannot begin until the permit is issued, and inspections must be requested at specific milestones.
Inspection Milestones
- Rough-in inspection: after piping is installed but before concealment.
- Final inspection: after all components are installed and system is tested.
- Hydrostatic test: typically 200 psi for 2 hours (or 50 psi above working pressure).
- Flow test: verifies alarm and flow switch operation.
Traps
- Starting work before permit issuance.
- Missing the rough-in inspection before covering walls.
- Confusing hydrostatic test pressure requirements.
- Failing to provide as-built drawings at closeout.
Worked Example
A tenant improvement adds 40 sprinklers. The contractor must submit revised plans, obtain a permit, complete rough-in inspection before ceiling closure, hydrostatically test at 200 psi for 2 hours, and pass final inspection before occupancy.
Rule of Thumb
Schedule inspections early; a failed inspection can delay occupancy and trigger re-inspection fees.