Patent ID: 7942207

Claim:
A dry ceiling-only storage occupancy fire protection system comprising: a grid of upright control mode sprinklers defining a sprinkler-to-sprinkler spacing ranging from about eight feet to ten feet (8 ft-10 ft.) so as to define a coverage area per sprinkler ranging from about eighty square feet (80 sq. ft.) to about one hundred square feet (100 sq. ft.), each sprinkler including: a sprinkler body having an inlet and an outlet with a passageway disposed therebetween defining a nominal K-factor of at least 25; a closure assembly including a plug; a thermally rated trigger assembly to support the closure assembly adjacent the outlet of the sprinkler body, the trigger assembly having a temperature rating of about 286° F., and a deflector coupled to the body and spaced from the outlet, the deflector having a perimeter portion and a central portion with the perimeter portion including a plurality of spaced apart segments and the central portion being spaced further from the outlet than the perimeter portion, the system further comprising a network of pipes including at least one main pipe and a plurality of spaced apart branch lines interconnecting the grid of upright control mode sprinklers, the network of pipes being filled with a pressurized gas and locating the grid of sprinklers relative to a fluid source in which about twenty-two to about twenty-six (22-26) hydraulically remote sprinklers in the grid of sprinklers define a hydraulic design area of the system, the network of pipes delivering upon activation of a first hydraulically remote sprinkler, a minimum operating pressure ranging from about fifteen pounds per square inch to about twenty pounds per square inch (15-20 psi.) of fluid from the fluid source to each of the hydraulically remote sprinklers within twenty-five to thirty seconds (25-30 sec.) to protect a commodity of any one of Class I, Class II, and Class III stored beneath a ceiling having a maximum ceiling height ranging from thirty-five feet to forty-five feet (35 ft.-45 ft.), the commodity having a maximum storage height ranging from about thirty feet to about forty feet (30 ft.-40 ft.) and maintaining a minimum deflector-to-storage clearance of at least thirty-six inches (36 in.), the storage having a configuration of any one of rack, palletized, bin box, and shelf storage, the rack storage being any one of single-row, double-row and multi-row rack storage.