Patent ID: 7793736

Claim:
A dry ceiling-only storage occupancy fire protection system comprising: a grid of control mode sprinklers defining a sprinkler-to-sprinkler spacing ranging from eight feet to twelve feet (8 ft.-12 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 K-factor of at least one of about 17, 19, 22 and 25, a closure assembly, 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 spaced adjacent the outlet to define an upright configuration of the sprinkler; and a network of pipes including at least one main pipe and a plurality of spaced apart branch lines interconnecting the grid of control mode sprinklers, the network of pipes locating the grid of sprinklers relative to a fluid source in which about eighteen to twenty-six (18-26) hydraulically remote sprinklers in the grid of control mode sprinklers define a hydraulic design area of the system, the network of pipes that delivers upon activation of a first hydraulically remote sprinkler a minimum operating pressure ranging from about fifteen to about forty-five pounds per square inch (15 psi. to 45 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 at least Class I and Class II stored beneath a ceiling having a maximum ceiling height ranging from thirty feet to forty-five feet (30 ft.-45 ft.), the commodity having a storage 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.