What is the acceptable flow of water normally required for a pipe schedule sprinkler system that has a minimum pressure of 20 psi (1.4 bar) in an ordinary hazard occupancy? Calculator A 500-750 gpm (1,893-2,839 L/min) 700-1,000 gpm (2,650-3,785 L/min) D 850-1,500 gpm (3,218-5,678 L/min) D 1,750-2,000 gpm (6,624-7,571 L/min)