Design rules for Fire water: hydrant, sprinkler & fire pumps

TopicsOpen

Fire water: hydrant, sprinkler & fire pumps

IS 13039:2014 Table 1, light hazard. Up to 20 hydrants: 1,620 L/min (96 m³/h). Up to 55: 2,280 L/min (137 m³/h). Up to 100: 2,850 L/min (171 m³/h).
Table 2, ordinary hazard. Up to 20: 2,280 L/min (137 m³/h). Up to 55: 2,850 L/min (171 m³/h). Up to 100: 4,550 L/min (273 m³/h).
Table 3, high hazard. Up to 20: 2,850 L/min (171 m³/h). Up to 55: 4,550 L/min (273 m³/h). Up to 100: 6,825 L/min (410 m³/h).
Table pressure on this desk: 5.6 kg/cm² when the hazard is light, the height is at or below 15 m and the hydrants are at or below 20. Otherwise 7 kg/cm², or 8.8 kg/cm² when the hazard is high or the height is above 15 m.
Sprinkler demand, IS 15105: Q = density × area of operation. Light 2.25 mm/min over 84 m². Ordinary 5 mm/min over 144 m². High 12.5 mm/min over 260 m². Not the whole floor.
Tank m³ = flow L/min × hours × 60 / 1,000. Duration on this desk is 1 h light, 2 h ordinary, 3 h high. IS 13039:2014 Table 4. 3,400 L/min × 3 h = 612 m³.
Jockey: 4 percent of the main pump, between 3 and 5 percent, at the main head plus 5 m, and not below 180 L/min. IS 13039:2014 cl. 5.1.9.
Friction head: Hazen–Williams, C = 120.

Links

Catalogue categories: Pumps, Valves

Standards cited by number for reference; verify designs with a qualified engineer.