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Chapter 4 — System Installation <br /> Page 4 -13 <br /> REV. 2 <br /> • 9. If Teflon tape is used on threaded ends, start at the sec- ► TEE POSITIONING <br /> and male thread and wrap the tape clockwise around <br /> the threads, away from the pipe opening. In order to obtain equal distribution at a tee, the dry chemi- <br /> cal must enter the side port of the tee and exit through the <br /> 0- 10. All system piping must comply with Section A -5 -9.1 of two end ports. See Figure 4 -26. <br /> NFPA -17. CORRECT INCORRECT <br /> NOT LESS THAN • <br /> 20 PIPE DIAMETERS TO NOZZLE(S) TO NOZZLE(S) TO NOZZLE(S) INCOMING <br /> 1 1 <br /> • <br /> INCOMING TO NOZZLE(S) <br /> Figure 4 -26. Tee Positioning <br /> ► 003126 <br /> Hanger /Support Installation <br /> The hanger /supports must be installed in conjunction with <br /> the pipe and fittings. The spacing requirements for hang- <br /> ers /supports depend on the pipe size being utilized; refer to <br /> the Spacing Guidelines Chart. <br /> PIPE HANGER SPACING GUIDELINES CHART <br /> Distribution Maximum Spacing Distance <br /> Pipe Size Hanger to Hanger <br /> in. ft. m <br /> • 1/4 4 (1.2) <br /> 1/2 6 (1.8) <br /> Figure 4 -25. Acceptable Piping Methods. 3/4 8 (2.4) <br /> 002965PC ■ 1 12 (3.6) <br /> CAUTION Other factors that influence hanger /support spacing are: <br /> Do not apply Teflon tape to cover or overlap the pipe •Hanger /Support must be placed within 1 ft. (0.3 m) of the <br /> opening, as the pipe and nozzles could become discharge nozzle. <br /> blocked and prevent the proper flow of agent <br /> Hanger /Support must be placed between elbows when dis- <br /> tance is greater than 2 ft. (0.6 m). <br /> 1 FT. <br /> (0.3 m) <br /> 004869PC <br /> r <br /> 2 FT. (0.6 m) <br /> OR MORE <br /> ` �giu <br /> !S 000474 <br /> Figure 4 -27. Hanger /Support. <br /> ULEX 3437 CEx732 <br /> March 17, 2004 <br />