ESFR 设计及应用.ppt

至货物顶端的净距 喷头溅水盘距货物顶端距离不能小于36 in. (914 mm)。 (NFPA 13) 货物顶部要低于喷头溅水盘最小36 in. (914 mm)。 (FM 2-2) Thank you * * * * * Suspended ceilings should extend to vertical floor-to-ceiling walls or partitions. If not, eliminate storage between the edge of the ceiling the nearest sprinklers. Design suspended ceilings to withstand fire plume uplift velocity pressures of at least 3 lb/ft2 (14.4 kg/m2). * Suspended ceilings should extend to vertical floor-to-ceiling walls or partitions. If not, eliminate storage between the edge of the ceiling the nearest sprinklers. Design suspended ceilings to withstand fire plume uplift velocity pressures of at least 3 lb/ft2 (14.4 kg/m2). * If a fire starts beneath an automatic heat/smoke vent that vent operates before sprinklers do, the venting could result in a critical delay in sprinkler operation. * If it is not possible to meet 2.2.6.1, chose one of the following options to ensure proper operation of suppression mode sprinklers in buildings with ceiling-level ventilation: a) Sprinklers Beneath Vent Openings Install suppression mode sprinklers of the same type used elsewhere in the building centered in vent openings having a maximum dimension of 4.5 ft (1.37 m). This option does not apply to storage of commodities greater in hazard than cartoned unexpanded plastic, such as uncartoned plastic, aerosols or rolled tissue in buildings higher than 30 ft (9.14 m). b) Subceiling Install a subceiling under the vent and install suppression mode sprinklers below the ceiling. Locate and size the subceiling so that the air velocity at sprinklers around the subceiling does not exceed 5 ft/sec (1.52 m/sec). Maintaining air velocities at the required level may result in a large subceiling and the required vertical distances from the ceiling to the subceiling may be large. Design the subceiling to meet the requirements of section 2.2.5. c) Heat/Flame Detection Install FM Approved line-type detection or flame detection designed to shut fans down in pow