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For a pipe-schedule sprinkler system, the minimum water flow at the base of the riser depends on the occupancy hazard classification, as defined in NFPA 13. For Ordinary Hazard (Group 1) occupancies, the minimum required flow at the base of the riser is 500 gpm (1,893 L/min). The 500 gpm flow ensures sufficient water supply to the sprinkler system to suppress fires involving moderate combustibles. Higher flows (e.g., 700 gpm and 850 gpm) are required for more severe hazards (e.g., Extra Hazard occupancies). Reference: NFPA 13, Table 11.2.3.1.1: Minimum flow requirements for pipe-schedule systems.
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