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20.08.049 <br />406.3.6 Deduct pressure losses <br />from city main to control valve by <br />multiplying friction loss per foot by <br />the total length(s) of pipe in feet (m). <br />(Include all fittings). <br />406.3.7 Deduct pressure losses for <br />piping within building by multiply- <br />ing friction loss per foot by the total <br />length in feet (m) of each size of <br />pipe between the control valve, <br />check valves, flow switch and the <br />fazthest sprinkler. <br />406.3.8 Deduct valve(s) and fitting <br />pressure losses. Count the valves and <br />fittings from the control valve to the <br />farthest sprinkler. Determine the <br />equivalent length for each valve and <br />fitting as shown in Table IV and add <br />these values to obtain the total equiv- <br />alent length for each pipe size. <br />406.3.9 In multi-level buildings, <br />these steps shall be repeated to size <br />piping for each floor. <br />406.3.10 If the remaining pressure <br />is less than the operating pressure es- <br />tablished by the testing laboratory <br />for the sprinkler being used, a rede- <br />sign is necessary. If this pressure is <br />higher than required, smaller piping <br />may be used when justified by calcu- <br />lations. <br />406.3.11 The remaining piping <br />shall be sized the same as the piping <br />to the farthest sprinkler unless small- <br />er sizes aze justified by calculations. <br />Exception: For sprinklered dwell- <br />ings manufactured off site, the <br />minimum pressure needed to satis- <br />fy the system design criteria on the <br />system side of the meter shall be <br />specified on a data plate by the <br />manufacturer. <br />406.4 To size piping for systems <br />with an elevated tank, pump, or <br />pump-tank combination, determine <br />the pressure at the water supply <br />outlet and proceed through steps <br />406.3.3 through 406.3.11. <br />Sec. 9.407 Piping Configurations <br />Piping configurations may be looped, <br />gridded, straight run, or combina- <br />tions thereof. <br />Sec. 9.408 Location of Sprinklers. <br />Sprinklers shall be installed in all azeas. <br />Exception #1: Sprinklers may be <br />omitted from bathrooms not exceed- <br />ing 55 square feet (5.1 m) with non- <br />combustible plumbing fixtures. <br />Exception #2: Sprinklers may be <br />omitted from small closets where the <br />least dimension does not exceed 3 <br />feet (0.9 M), the area does not ex- <br />ceed 24 square feet (2.2 m), and the <br />walls and ceiling are surfaced with <br />non-combustible materials. <br />Exception #3: Sprinklers may be <br />omitted from attics and crawl spaces <br />which aze not used or intended for <br />(Pleasanton April 2000) 700_ 1 ~ <br />