UL 199-2020 pdf download – Automatic Sprinklers for Fire-Protection Service.
5.28 RECESSED CEILING SPRINKLER – A sprinkler assembly in which all or part of the sprinkler body or frame, other than the inlet thread, is mounted within a recessed housing. 5.29 RESIDENTIAL SPRINKLER – A sprinkler intended to be installed in residential occupancies. 5.30 RESPONSE TIME INDEX (RTI) – A measure of the thermal sensitivity of the sprinkler’s heat responsive element. 5.31 SIDEWALL SPRAY SPRINKLER – A sprinkler intended for installation on or near the wall and near the ceiling, and designed to discharge most of the water away from the nearby wall with a small portion of the discharge directed at the wall behind the sprinkler. 5.32 SPECIFIC APPLICATION SPRINKLERS – A sprinkler intended for a limited end use such as for protecting windows, combustible concealed spaces or attics. 5.33 SPRAY SPRINKLER (STANDARD) – A sprinkler intended for installation in either the upright or pendent position respectively, designed to distribute water downward in an umbrella-shaped pattern. The discharge from a spray sprinkler having a nominal 5.6 (80) “K” factor covers a circle 16 feet (4.88 m) in diameter, 4 feet (1.22 m) below the sprinkler, when the sprinkler is discharging water at the rate of 15 gallons per minute (57 L/min). See 10 Pan Distribution Test, 54.3. 5.34 STANDARD FIRE TEST COMMODITY – CARTONED GROUP A PLASTICS (UNEXPANDED) – Single wall corrugated cardboard cartons measuring a nominal 21 by 21 by 20.5 inches high (0.53 by 0.53 by 0.52 m) containing 125 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.
7.1 An automatic sprinkler shall be constructed to effect closure of its water seat for extended periods of time without leakage and to open as intended and release all 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). 7.2 For dry-type pendent and sidewall sprinklers, the connection of the extension nipple to the seal assembly at the inlet shall be airtight. See Dry Sprinkler Air Tightness Test, Section 27. 7.3 Stampings shall show no cracking or splitting and shall be uniformly smooth and clean cut. 7.4 An automatic sprinkler shall be chemically or mechanically staked to maintain the manufacturer’s assembly load. The assembly load shall not be able to be changed by the use of common hand tools without causing visible damage to the sprinkler. 7.5 Sprinkler types or materials not anticipated by these requirements require additional evaluation, such as tests to investigate special metallic or nonmetallic materials.