NFPA 13 occupancy hazard classification (Light, Ordinary Group 1/2, Extra Hazard Group 1/2), storage commodity classification (Class I-IV, plastics, high-piled storage), and how classification drives density/area design criteria.
Every NFPA 13 sprinkler design starts with a classification decision that every downstream hydraulic calculation depends on entirely. This module works through Light Hazard, Ordinary Hazard Group 1 and 2, and Extra Hazard Group 1 and 2 occupancy classifications and the density/area curve each one maps to, then the separate commodity classification system — Class I through IV, Group A/B/C plastics, and high-piled storage — that storage occupancies use instead, and why the two systems exist side by side.
By the end of this module you should be able to explain why a classification error isn't a minor correction but a change to the fundamental input every pipe size and pump selection downstream was calculated from.