NFPA 15-2001 Standard for Water Spray Fixed Systems for Fire Protection

NFPA 15-2001 Standard for Water Spray Fixed Systems for Fire Protection.
3.3.3 Combined System. A system of piping that connects both sprinklers and water spraynozzles in a common fire area, and is supplied by a single riser and system actuation valve. 3.3.4 Control of Burning. Application of water spray to equipment or areas where a fire can occur to control the rate ofburning and thereby limit the heat release from a fire until the fuel can be eliminated or extinguishment effected. 3.3.5 Deflagration. Propagation of a combustion zone at a velocity that is less than the speed of sound in the unreacted medium. 3.3.6 Density. The unitrate ofwaterapplication to an areaor surface expressed in gpm/ft 2 [(L/min)/m 2 ]. 3.3.7 Detonation. Propagation ofa combustion zone at a ve- locity that is greater than the speed ofsound in the unreacted medium. 3.3.8 Electrical Clearance. The air distance between the wa- ter spray equipment, including piping and nozzles, and unen- closed or uninsulated live electrical components at other than ground potential. 3.3.9 Exposure Protection. Absorption of heat through ap- plication ofwater spray to structures or equipment exposed to a fire, to limit surface temperature to a level that will minimize damage and prevent failure. 3.3.10* Fire Area. An area that is physically separated from other areas byspace, barriers, walls, or othermeans in orderto contain fire within that area.
3.3.11 Flammable and Combustible Liquids. Flammable liq- uids shall be or shall include any liquids having a flash point below 100°F (37.8°C) and having a vapor pressure notexceed- ing 40 psi (276 kPa) (absolute) at 100°F (37.8°C). Flammable liquids shall be subdivided as follows: Class I liquids shall in- clude those having flash points below100°F (37.8°C) and shall be subdivided as follows: (1) Class IA liquids shall include those having flash points below 73°F (22.8°C) and having a boiling point below 100°F (37.8°C); (2) Class IB liquids shall include those having flash points below 73°F (22.8°C) and having a boiling point above 100°F (37.8°C); (3) Class IC liq- uids shall include those having flash points at or above 73°F (22.8°C) and below 100°F (37.8°C). Combustible liquids shall be or shall include any liquids having a flash point at or above 100°F (37.8°C). They shall be subdivided as follows: (1) Class II liquids shall include those having flash points at or above 100°F (37.8°C) and below 140°F (60°C); (2) Class IIIAliquids shall include those having flash points at or above 140°F (60°C) and below 200°F (93.3°C); (3) Class IIIB liquids shall include those having flash points at or above 200°F (93.3°C). 3.3.12 Impingement. The striking of a protected surface by water droplets issuing directly from a water spray nozzle. 3.3.13 Insulation. 3.3.13.1* Insulated. Refers to equipment, structures, or ves- sels provided with an encapsulating material that, for the ex- pected duration offire exposure, will limit steel temperatures to a maximum of 850°F (454°C) for structural members or 650°F (343°C) for vessels. The insulation system shall be: (1) Noncombustible and fire retardant; (2) Mildew and weather resistant; (3) Resistant to the force of hose streams; and (4) Secured by fire and corrosion-resistant fastenings.NFPA 15 pdf download.