26 September 2006
CHAPTER 3 WATER SUPPLY FOR FIRE PROTECTION
WATER DEMANDS FOR SPRINKLERED FACILITIES
The water demand required for sprinkler protection depends upon occupancy,
discharge density, design area, and type of sprinkler system (wet or dry), type of
construction, and other building features.
Water Demand for Sprinklers.
The water demand required for sprinklers must be determined from Table 4-1.
Design densities indicated in Table 4-1 are minimum densities, and each
sprinkler in the design area must discharge at least the flow rate required to
produce the stipulated density.
Design areas shown in Table 4-1 are the hydraulically most remote areas.
Water Demand for Hose Streams.
Hose streams are needed concurrently with sprinkler discharge in order to effect
final extinguishment or to wet down adjacent structures. The hose stream
demand for sprinklered occupancies must be determined from Table 4-1.
Total Water Demand for Sprinklered Occupancies.
The total water demand for sprinklered occupancies is equal to the sum of the
domestic/industrial demand plus the sprinkler system(s) water demand and the
hose stream(s) demand. The total demand must be available at the sprinkler
system connection to the underground main, and at the pressure necessary to
produce the required sprinkler density over the required hydraulically most
remote area of sprinkler operation.
Water Demand for Sprinklers (Special Facilities).
Special requirements apply to some facilities, as indicated in paragraphs 3-1.5.1
Water demand for family housing must be the sprinkler water demand plus
domestic demand and 950 L/m (250 gpm) for hose streams.