Suppose that the sprinklers are spaced 14 ft. To begin a calculation, the designer starts with the end-sprinkler and works вЂњbackwardsвЂќ to the water supply source.

When hydraulically calculating a light hazard sprinkler system, the design density utilized is typically 0.10 gpm/sf over a 1500 square foot (the most hydraulically demanding) area of operation. The NFPA 13 Density / Area Curves are found in Fig. It should be noted that commercial insurance carriers and consultants develop their own literature containing more extensive listings of occupancy examples and classifications than does the NFPA 13 standard, data which often comes in handy when making an occupancy classification determination. However, where the required design density is less than 0.25 gpm/sf (and this goes for high-piled storage as well), a protection area of up to 130 square feet per sprinkler is allowable (Table 8.6.2.2.1-c). Maximum sprinkler spacing for these occupancies is limited to 100 square feet. Standard sprinklers protecting all ordinary hazard occupancies shall not cover an excess of 130 square feet per head (Table 8.6.2.2.1(b).Д®xtra hazard occupancy examples include printing plants, paint and varnish dipping operations, plywood manufacturing, solvent cleaning, and plastics processing. Ordinary hazard Group 2 occupancies include the aforementioned dry cleaners, automobile repair and services areas, auditorium stages, woodworking plants, post offices, and stack room areas of libraries. Ordinary hazard Group 1 occupancies include laundries, restaurant service areas, and automobile parking garages. apart, the maximum coverage limit shrinks to 130 square feet.

However, when exposed construction is combustible, with structural members spaced less than 3 ft. Usually, the maximum limit is 225 square feet for light hazard on a hydraulically calculated system. The maximum sprinkler spacing (protection area) for these is noted in Table 8.6.2.2.1(a) if standard sprinklers are used. The following are noted as light hazard occupancies: offices, churches, schools, museums, auditoriums, library seating areas, restaurant seating areas, and unused attics. An assortment of building occupancy examples are classified in Sec.

Fire sprinkler system design examples