UL 1767-2013 pdf download – Early-Suppression Fast-Response Sprinklers.
5.1 1 OPERATING TEMPERATURE – The temperature at which the heat responsive element of a sprinkler operates when immersed in a liquid bath under controlled rate of rise conditions. 5.1 2 ORIFICE – The opening, usually circular, that controls the amount of water discharged from a sprinkler at a given pressure. 5.1 3 PENDENT SPRINKLER – A sprinkler intended to be installed so that its deflector is located below the orifice and the water flows downward against the deflector. 5.1 4 REQUIRED DELIVERED DENSITY (RDD) – The minimum rate of water that must be discharged onto the top of a protected horizontal surface under a fire condition to achieve early suppression. 5.1 5 RESPONSE TIME INDEX (RTI) – A measure of the thermal sensitivity of the sprinkler’s heat responsive element. 5.1 6 STANDARD FIRE TEST COMMODITY – CARTONED GROUP A PLASTICS (UNEXPANDED) – Single wall corrugated cardboard cartons measuring a nominal 21 by 21 by 20.5 inches (0.53 by 0.53 by 0.52 m) high containing 1 25 crystalline polystyrene cups in separate compartments within the carton. Single wall corrugated cardboard sheets are used to separate the five layers of cups and interlocking single wall corrugated cardboard vertical dividers are used to separate the 25 cups in each layer. Eight of the cartons are arranged in a 2 x 2 x 2 array with the open end of the cups facing down and placed on a nominal 42 by 42 by 5 inches (1 .1 by 1 .1 by 0.1 3 m) high two-way hardwood pallet. 5.1 7 STANDARD FIRE TEST COMMODITY – CLASS II – Double tri-wall corrugated cardboard cartons with five-sided steel (open bottom) stiffeners inserted for stability. The cartons are to comply with the requirements for Class 2, Style E, ″AAA″ fluting as specified in the Federal Specification for Boxes, Fiberboard, Corrugated, Tri-Wall, PPP-B-640D. The two cartons have a combined nominal thickness of 1 inch (25.4 mm).
6 General 6.1 An ESFR sprinkler shall be constructed to remain closed for extended periods of time without leakage and to open as intended and release all operating parts as specified in this standard. The closure of the water seat shall not be achieved by the use of a dynamic O-ring or similar seal (an O-ring or similar seal that moves during operation or is in contact with a component that moves during operation). 6.2 An ESFR sprinkler shall be constructed and assembled so that, upon actuation, it releases parts that will clear the waterway and provide the intended discharge pattern.