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R-102 Restaurant Fire Suppression Manual SECTION 4—SYSTEM DESIGN <br /> UL EX3470 ULC EX3470 <br /> 2014-SEP-01 REV. 11 PAGE 4-67 <br /> DISTRIBUTION PIPING REQUIREMENTS (Continued) <br /> Distribution Piping Requirements—3.0 Gallon System <br /> 1. The maximum length between the start of the first branch SUPPLY <br /> TEE <br /> line and the start of the last branch line must not exceed <br /> 24 ft (7.3 m). When the supply line is split, the combined <br /> total of both legs of the supply line (from the start of the <br /> first branch line to the start of the last branch line) must not DOOM <br /> exceed 24 ft(7.3 m). See Figure 4-134. COMBINED LENGTH OF <br /> BOTH LEGS OF SUPPLY <br /> 2. The total length of all branch lines must not exceed 36 ft LINE MUST NOT 3 BRANCH LINES <br /> (10.9 m). See Figure 4-134. EXCEED 24 FT(7.3 rn) <br /> 3. Use a 3/8 in.union to connect the tank adaptor to the 3/8 in. <br /> supply line. <br /> SUPPLY IN NOZZLE <br /> TEE <br /> 4. A maximum of two nozzles are allowed per duct branch line. 2W NOZZLE <br /> 5. The requirements of the following table must not be <br /> exceeded: <br /> IN NOZZLE <br /> O 230 NOZZLE <br /> j 245 NOZZLE 112N NOZZLE <br /> (BRANCH LINE IN BOLD) <br /> COMBINED LENGTH MUST ODD502 <br /> NOT EXCEED 36 FT(10.9 m) <br /> FIGURE 4-134 <br /> ►3.0 GALLON SYSTEM <br /> Duct Plenum Appliance <br /> Requirements Supply Line Branch Line Branch Line Branch Line <br /> Pipe Size 3/8 in. 3/8 in. 3/8 in. 3/8 in. <br /> Maximum Length 40 ft 8 ft 4 ft 12ft <br /> (12.1 m) (2.4 m) (1.2 m) (3.6 m) <br /> Maximum Rise 6 ft 4 ft 2 ft 2 ft <br /> (1.8 M) (1.2 m) (0.6 m) (0.6 m) <br /> Maximum 900 9 4 4 6 <br /> Elbows <br /> Maximum Tees 1 2 2 4 <br /> Maximum Flow 11* 4 2 4 <br /> Numbers <br /> *Exceptions: <br /> 1.Twelve flow numbers are allowed In any one tank for duct and plenum protection only. <br /> 2.Twelve flow numbers are allowed with any one tank using only two-flow appliance nozzles. <br /> 3.Twelve flow numbers are allowed with any one tank using only three-flow appliance nozzles. <br /> Spacial Instructions: <br /> 1.Twelve flow numbers are allowed when four Dean Industries GTI Gas Fryers are protected at low proximity as shown In Figure 4-66 on Page 4-32.The discharge piping must be <br /> as shown in Figure 4-67 on Page 4-32. <br /> 2.For certain McDonald's applications,11.5 flow numbers are allowed when using a combination of one 2W duct nozzle,one 1/2N electrostatic precipitator nozzle, <br /> one 1 N plenum nozzle,and four two-flow appliance nozzles.Contact the Applications Engineering Department for additional Information. <br />