(2) Reduced water demand, potentially eliminating the need for a fire pump and/or water tank. Reduced Cost: (1) Reduced number of in-rack sprinklers based on increased vertical spacing and increased storage height above the top row of in-rack sprinklers.Size the water supply accounting for both, the ceiling and in-rack sprinkler systems, based on the larger of the two system requirements only (i.e., worst case of the two demands).Allow for storage above the top in-rack sprinkler level to be as high as 35 to 40 feet (!) depending on the commodity hazard being protected 3.Allow in-rack sprinklers to be installed every 30 to 40 feet vertically (!) depending on the commodity hazard being protected.The new provisions in FMвЂ™s Data Sheet 8-9: Recently these new protection schemes were added to FM Global Property Loss Prevention Data Sheet 8-9, Storage of Class 1, 2, 3, 4, and Plastic Commodities 1. FMвЂ™s alternative in-rack sprinkler designs improve on conditions on both fronts.ДЇM Global further expanded and generalized the application of large orifice in-rack sprinklers in high-piled storage applications. However, the use of in-rack sprinklers based on NFPA 13 requirements are often met with concerns by building owners for increased installation costs and by warehouse operators for the additional risks of damage to the sprinkler heads during loading and unloading of the racks. Per NFPA 13 Standard 2, Installation of Sprinkler Systems, in-rack sprinklers at various vertical levels (usually every 5-10 ft) may be required depending on the commodity hazard, shelf condition, and storage height. Traditional in-rack sprinkler systems are used to protect rack storage for high hazard commodities and large storage heights. It was shown that for the tested scenarios (with 35 ft to 43 ft of rack storage, Group A Plastics) face sprinklers could be eliminated and in-rack sprinklers needed only be mounted at one or two vertical levels and only applied in the longitudinal flue spaces. Previously, UL fire tests successfully demonstrated the feasibility of new protection schemes based on large orifice in-rack sprinklers in favor of using traditional in-rack sprinkler for high-piled storage applications. These new protections apply to all commodities including high hazard (plastics) commodities. They demonstrated that large orifice sprinklers and higher flow rates can be successfully applied to not only simplify the sprinkler system but also reduce the total sprinkler water demand. Large-scale fire tests were used to validate these alternative designs. These new protection options can reduce installation costs by as much as 50%. FM Global updated their Data Sheet 8-9 with new high-piled rack storage protection schemes.

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