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Chapter 3 - System Design Page 3 -11 REV. 3 Detector Placement Thermal detectors are required in all hazard areas protect- A temperature survey must be performed to determine the ed by the PYRO -CHEM Open Face Paint Spray Booth ■ maximum ambient temperature of the hazard survey. See Industrial Fire Suppression System if automatic system Temperature Chart in Chapter 2 - Components. operation is required. Either mechanical or electrical ther- mal detectors can be used for automatic system operation. TOTAL FLOODING (DETECTOR SPACING) - FUSIBLE Mechanical detectors (fusible links) are used in conjunction LINKS with the PYRO -CHEM Models MCH3 and NMCH3 control Ceiling Height Spacing devices. Electrical detectors are used in conjunction with Up to 14 ft. (4.2 m) 10 ft. (3.0 m) maximum the PYRO -CHEM Models ECH3 -24 and ECH3 -120 Control Height detectors Heads. 5 ft. (1.5 m) max. from a wall* 100 sq. ft. (9.2 sq. m) max. coverage TOTAL FLOODING (DETECTOR SPACING) - THERMAL per detector Ceiling Height Spacing Greater than 8 ft. (2.4 m) max. between detectors Up to 14 ft. (4.2 m) 15 ft. (4.5 m) maximum 14 ft. (4.2 m) up to Height between detectors 20 ft. (6.1 m) height 4 ft. (1.2 m) max. from wall 7 ft. 6 in. (2.3 m) max. from wall 64 sq. ft. (5.9 sq. m) max. coverage 225 sq. ft. (20.9 sq. m) max. per detector coverage per detector NOTE: For sloped ceiling (peaked type or shed type) Greater than 13 ft. (3.9 m) maximum installations, refer to NFPA -72, "National Fire Alarm Code" 14 ft. (4.2 m) between detectors for detailed spacing requirements. up to 20 ft. 6 ft. 6 in. (1.9 m) max. from wall LOCAL APPLICATION - OVERHEAD (DETECTOR SPAC- (6.1 m) height 169 sq. ft. (15.7 sq. m) max. ING) - Maximum spacing per fusible link detector is 36 ft. coverage per detector (3.3 m or 3 ft. (.9 m) from edge of hazard and 6 ft. (1.8 m) Greater than 11 ft. (3.4 m) max. between fusible link detectors. 20 ft. (6.9 m) between detectors When a detector(s) is mounted more than 1 ft. (.3 m) below up to 24 ft. (7.3 m) 5 ft. 6 in. (1.7 m) max. from wall ceiling or in an open area, heat trap(s) is recommended. 121 sq. ft. (11.2 sq. m) max. Detectors should be mounted overhead at nozzle height or coverage per detector as close to the hazard as possible without interference, not Greater than 9 ft. (2.7 m) max. to exceed 10 ft. (3 m). 24 ft. (7.3 m) between detectors Detectors should not be located where they will be suscep- up to 30 ft. (9.1 m) 4 ft. 6 in. (1.4 m) max. from wall tible to damage during the normal work operation. 81 sq. ft. (7.5 sq. m) max. LOCAL APPLICATION - TANKSIDE (DETECTOR SPAC- coverage per detector ING) - Detectors can be located either near the inner tank NOTE: For sloped ceiling (peaked type or shed type) wall and flammable liquid surface or above the tank. If locat- installations, refer to NFPA -72, "National Fire Alarm Code" ed above the tank, the rules for local application overhead for detailed spacing requirements. would apply. If located on the tank wall, the detectors can be LOCAL APPLICATION - OVERHEAD (DETECTOR mounted horizontally or vertically in the freeboard area but SPACING) - Maximum spacing per detector is 100 ft.2 must be protected from damage during normal working (9.3 m or 5 ft. (1.5 m) from edge of hazard and 10 ft. operation. Detectors should be located at a maximum spac- (3.1 m) between detectors. When detectors are mounted ing per detector of 3 ft. (.9 m) from edge of hazard and 6 ft. below the ceiling in an open area, heat traps are recom- (1.8 m) between detectors on the long side of the tank. mended. *For 14 ft. (4.3 m) wide booths with maximum height of 12 ft. (3.7 m), the LOCAL APPLICATION - TANKSIDE (DETECTOR SPAC- detector location off the side wall can be a maximum of 7 ft. (2.1 m). ING) - Detectors can be located either near the inner tank wall and flammable liquid surface or above the tank. If locat- ed above the tank, the rules for local application overhead would apply. If located on the tank wall, the detectors can be mounted horizontally or vertically in the freeboard area, but must be protected from damage during normal working operations. The maximum spacing per detector is 5 ft. (1.5 m) from edge of hazard and 10 ft. (3.1 m) between detectors. ULEX 3437 CEx732 September 1, 2006