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Chapter 3 - System Design Page 3 -2 REV. 3 d. Piping Requirements: e. Nozzle Placement: Piping diagrams include limitations on pipe length and fit- The nozzle is to be mounted in the center (See Note) of the tings. See the following pages for specific piping design and protected area, with the discharge holes in the nozzle no limitations for each size cylinder. greater than six (6) inches from the ceiling. For duct protec- tion, the nozzle is to be mounted in the center. See Figure ►Note: All listed piping diagrams represent maximum number 3 -1. of nozzles allowed. In applications that do not require the maximum number of nozzles, the quantity of nozzles can be reduced. In applications of this type, along with the already listed lim- itations (notes included with each maximum layout), the fol- lowing limitations apply: • On the reduced nozzle side of the piping layout, the largest listed size pipe on the standard configuration lay- Height out must be utilized from T1 to nozzle. • The maximum length of the reduced nozzle side must be the original combination from T1 to T2, and T2 to nozzle. Note: In systems utilizing a T3 split, the maximum length 1 of the reduced nozzle side must be the original combina \ tion from T1 to T2, T2 to T3, and T3 to nozzle. • The maximum number of elbows must be the original Side1 Side combiantion from T1 to T2, and T2 to nozzle. Note: In systems utilizing a T3 split, the maximum number of elbows must be the original combination from T1 to T2, T2 Figure 3 -1. Nozzle Location • to T3, and T3 to nozzle. 4 02866°° Note: See Design Chart for allowable offset of nozzles from center of each hazard area. f. Nozzle Coverages: Protection Zone /Nozzle Specifications Nozzle Location within Nozzle Nozzle Protection Nozzle L W Ht Maximum Protection Zone Offset** Orientation ► Screening N -SCR — 8 ft. 12 ft. Side 8 ft. (2.4 m) Length - Center 0 - 6 in. Vertical (2.5 m) (3.7 m) Width - Center Work Area N -OTF 8 ft. 8 ft. 12 ft. Area 64 sq ft Length - Center 0 - 6 in. Vertical (2.4 m) (2.4 m) (3.7 m) (5.9 sq. m) Width - Center Side 8 ft. (2.4 m) Plenum N -PLU 4 ft. 8 ft. 12 ft. Area 32 sq ft Length - Center 0 - 6 in. Vertical (1.2 m) (2.4 m) (3.7 m) (3 sq. m) Width - Center Side 8 ft. (2.4 m) Exhaust N -DCT 12 ft. (3.7 m) Perimeter or Length - Center 0 - 6 in. Vertical Duct* 3 ft. -10 in. (1.2 m) Dia. Width - Center (up) 24 ft. (7.3 m) Length * Single nozzle application on a PCI -15ABC or two nozzle application on a PCI- 25sABC only. ** Nozzle offset is the maximum distance from the tip of the nozzle and the closest edge of the protection zone. ULEX 3437 CEx732 September 1, 2006