NFPA Standards, Codes, and Plan Review/Inspection
Core concepts
Know which NFPA document governs what: NFPA 13 (installation), 13R (residential up to four stories), 13D (one- and two-family), 14 (standpipes), 20 (fire pumps), 25 (inspection, testing, maintenance), and 72 (alarm systems). Understand the plan review process: submittal requirements, hydraulic calculations, working plans, and the authority having jurisdiction's role. Inspection milestones include rough-in, hydrostatic test (typically 200 psi for two hours or 50 psi above working pressure), flushing, and final acceptance. Know the difference between acceptance testing and ongoing ITM.
Traps in questions
- Applying NFPA 13R where 13 is required (e.g., mixed occupancy or height).
- Confusing plan review approval with final acceptance.
- Forgetting hydrostatic test duration and pressure criteria.
- Overlooking that NFPA 25 governs maintenance, not installation.
- Assuming the contractor sets the code; the AHJ adopts and enforces.
Worked example / rule of thumb
A new wet system is installed; the contractor submits working plans and hydraulic calcs to the AHJ. After rough-in inspection, the system is hydrostatically tested at 200 psi for two hours (or 50 psi above maximum working pressure, whichever is greater). Then flushing and final inspection occur before acceptance. Rule of thumb: 13 = commercial, 13R = residential mid-rise, 13D = one/two-family; 25 = maintenance.