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......'Ia.....~o;,;;' "';-VY~~CIII I.JC;:'H., Page 3. Rev. CHAPTER III System Design This section will cover the proper design of the Pyro Chem Res- taurant Fire Suppression System. It is divided into four (4) sections: 1. Nozzle Coverage and Placement. 2. Cylinder Sizing. 3. Piping Limitations. 4. Detector Requirements. Each of these sections must be completed before attempting any installation. SECTION 1 Nozzle Coverage and Placement This section will provide guidelines for determining nozzle type, positioning, and quantity for duct, plenum, and appliance protection. A. Duct Protection The following three (3) nozzles have been developed for the protection of exhaust ducts; 1. Model NL-P. 2. Model NL-D2. 3. Model NL-D3. Each nozzle is approved for use with the exhaust fan dampered, undampered with the fan on, or undampered with the fan off. It is not required that the fan be shut down or the exhaust dud be dampered for the system to operate properly. Each nozzle is approved to protect exhaust ducts of unlimited length. 1. Model NL-P. The Model NL-P nozzle is a one (1) flow point nozzle designed for the protection of exhaust ducts. One (1) or two (2) Model NL-P nozzles can be used on a single duct branch. A sir.gle Model NL-P exhaust duct nozzle can protect a square or rectangular duct with a maximum perimeter of 50 inches and a maximum one-side length of 17 inches. It can also protect a round duct with a maximum circumference of 50 inches and a maximum diameter of 16 inches (see Figure 3-1). The nozzle must be installed on the centerline of the duct and aimed directly into the duct opening (see Figure 3-21. Two (2) Model NL-P exhaust duct nozzles can protect a square or rectangular duct with a maximum perimeter of 84 inches and a maximum one-side length of 34 inches. They can also protect a round duct with a maximum circumference of 84 inches and a maximum diameter of 26.5 inches. When two (2) Model NL-P nozzles are used to protect a single duct the cross sectional area of the duct must be divided into two equal symmetrical areas. The nozzle must then be installed on the center line of the area it protects and aimed directly into the duct opening (see Figure 3-2.1). 2. Model NL-D2. The Model NL-D2 nozzle is a two (2) flow point nozzle designed for the protection of exhaust ducts. Only one (1) Model NL-D2 nozzle can be used on a single duct branch. A single Model NL-D2 exhaust duct nozzle can protect a square or rectangular duct with a maximum perimeter of 75.5 inches and a maximum one-side length of 25 inches. It can also protect a round duct with a maximum circum- ference of 75.5 inches and a maximum diameter of 24 inches (see Figure 3-1). The nozzle must be installed on the centerline of the duct and aimed directly into the duct opening (see Figure 3-21. 3. Model NL-D3. The Model NL-D3 nozzle is a three (3) flow point nozzle designed for the protection of exhaust ducts. One (1) or two (2) Model NL-D3 nozzles can be IJsed on a single duct branch. A single Model NL-D3 exhaust duct nozzle can protect a square or rectangular duct with a maximum perimeter of 100 inches and a maximum one-side length of 33 inches. It can also protect a round duct with a maximum circum- ference of 100 inches and a maximum diameter of 31.75 inches (see Figure 3-1) The nozzle must be installed on the centerline of the duct and aimed directly into the duct opening (see Figure 3-2). Two (2) Model NL-D3 exhaust duct nozzles can protect a square or rectangular duct with a maximum perimeter of 150 inches and a maximum one-side length of 66 inches. They can also protect a round duct with a maximum circumference of 150 inches and a maximum diameter of 47.5 inches. When two (2) Model NL-D3 nozzles are used to protect a single duct, the cross sectional area of the duct must be divided into two equal symmetrical areas. The nozzle must then be installed on the centerline of the area it protects and aimed directly into the duct opening (see Figure 3.2.1). Nl-P -:---~ -r- Nt-D2 '-'-------, I 2'" MAX Nl-DJ ----~r I . -+- - --.. JI75' MAX - I ,--__--L , '+'- - -~ ". MAX " I ~________ L , ~~_-.i. 2t + 2W _ SO' MAX .'."--. 2l + 2W = 755' MAX ~t----~1 2l + 2W = 'CO' MAX -----~--l- ~" --.., --- - -. w ~-~----'- ___-1..___~ ______.1_ _..1. -'--L 117' ......Xl --.... -L 125' U"'XI-- L-l 133' V..VJ _ ~-+---~-----.- I _ i i 1- ~ - ~ le..5'!MAX i . 1-1 ~ 18_5' M...X -~ +-- - -~ - ~- 25' MAX I I I I L 1---- f-- 25' ""....x -- ,__0_ -. - ---;... 12S """'X i I ~_J--1... I -12.5' "'AX--< Figure 3-1. Duct Nozzle Coverage Limitations. ULEX 3830 November 1, 1994