![]() ![]() Myth: Sprinklers cause severe water damage.įact: A single sprinkler generates about 25 gallons per minute, depending on the water pressure and the size of the sprinkler's orifice. Water is prevented from entering a deluge system by a closed deluge valve that is controlled by a detection system specific to the occupancy being protected. Deluge systems use open sprinklers (they have no fusible thermal element) or specially designed nozzles. The only time water discharges from all sprinklers simultaneously is with a deluge sprinkler system. In fires of most occupancy types, only one or two sprinklers operate during a fire. Myth: When one "goes off", they all "go off".įact: Sprinklers operate independently, and only when the ambient air temperature from a fire rises to meet or exceed the sprinkler’s temperature rating. A small heat source, such as a match or a cigarette, will not cause a sprinkler to operate. ![]() Myth: Heat from lighting a cigarette can activate the system.įact: Sprinklers operate only when the ambient air temperature reaches the specific temperature rating of the sprinkler. Sprinklers with glass bulb thermal elements will be color-coded based on the color of the fluid within the bulb. ![]() To distinguish between different temperature ratings, sprinklers with fusible solder link-type thermal elements will have the appropriate temperature rating color-coded on either the frame arms of the sprinkler or the operating element itself. Temperature ratings can also be specified as part of specific NFPA 13 design requirements. Each temperature rating has an associated maximum ceiling temperature specified to safeguard against accidental operation due to excessive ambient temperatures in a particular location, such as unconditioned attics or warehouses. Sprinkler temperature ratings, classifications, and color coding can be found in the National Fire Protection Association's Standard 13 (NFPA 13), Standard for the Installation of Sprinkler Systems. ISO Electronic Numerical Listings of Classification CodesĪ sprinkler’s thermal operating element, whether glass bulb or solder link, operates at a predetermined temperature called its temperature rating.Estimating Software for Building and Repair. ![]()
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