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SECTION IV - SYSTEM DESIGN UL EX. 3470 ULC CEx747 Page 4-42 REV. 3 10-1-02 ~ ~ ACTUATION AND EXPELLENT GAS LINE REQUIREMENTS (Continued) Expellant Gas Line 1. The expellant gas line piping is installed from the regulated release mechanism in double and multiple-tank systems, and from the regulated actuator assembly in multiple-tank sys- tems. The expellant gas line is the piping between the regula- tor and the tank-enclosure/tank-bracket assembly. The total leng1h of the expellant gas line from the regulated release mechanism or each regulated actuator assembly must not exceed 30 ft. (9 m) when using a "double-tank" cartridge, an LT-A-101-3O Cartridge, or a 101-30 Cartridge. See Figures 74 and 75. "ANSUL AUTOMAN- REGULATED RELEASE ASSEMBLY .. FIGURE 74 ooon. EXPELLANT GAS LINE MAXIMUM LENGTH - 30 FT. (9 m). MAXIMUM NO. OF FITTINGS - 9 '\ .. FIGURE 75 000777 ~ ~ 2. A combined total of nine fittings may be used in these lines, eight goo elbows and one tee. Two 450 elbows equal one 900 elbow. 3. If two tanks are connected to the regulated release assembly in a multiple-tank system arrangement, the total combined leng1h of the actuation and expellant gas lines must not exceed 30 ft. (9 m) when using a "double-tank" nitrogen car- tridge, an LT-A-101-3O nitrogen cartridge, or a 101-30 carbon dioxide cartridge. See Figure 72. DISTRIBUTION PIPING REQUIREMENTS Once the nozzle placement and quantity of tanks has been deter- mined, it is then necessary to determine the piping configurations between the tank adaptor and each discharge nozzle. This section contains the guidelines and limitations for designing the distribu- tion piping so that the liquid agent will discharge from the nozzles at a proper flow rate. These limitations should also be referred to when selecting the mounting location for the regulated release mechanism and agent tank. General Piping Requirements 1. All R-102 system piping is straight line. Therefore, the need for critical lengths and balancing is minimized. 2 Two 450 elbows count as one goo elbow. 3. Each branch line includes the tee or elbow leading to it, and all fittings within the branch line itself. 4. The minimum piping leng1h of Schedule 40, 3/8 in. pipe from the tank outlet to any nozzle protecting a range, fryer, or wok must be 6 ft. (1.8 m). 5. Pipe leng1hs are measured from center of fitting to center of .. fitting. See Figure 76. ~. I" CENTER TO CENTER--:1 LY----*-~---~ .. FIGURE 76 ooon. 6. All distribution piping must be Schedule 40 black iron, chrome- plated, or stainless steel. Do not use hot dipped galvanized pipe on the distribution piping. .. 7. All threaded connections located in and above the protected area must be sealed with pipe tape. Tape should be applied to male threads only. Make certain tape does not extend over the end of the thread, as this could cause possible blockage of the agent distribution. 8. Before installing blow-off caps on nozzles, apply a small amount of Dow Corning No. 111 silicone grease across the opeing in the nozzle tip and also a small amount coating the exterior of the blow-off cap. This will help keep cooking grease .. from building up on the cap. ~