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NFPA 13D permits `:support methods comparable to those required by local <br /> plumbing codes." The above hanger/support requirements must also be <br /> followed on NFPA 13D systems. <br /> CAUTION: DO NOT use hanger items such as plumber's tape or "nail-on" <br /> devices. Pipe hanger must comply with NEPA 13, 13D and 13R. <br /> When a sprinkler head activates, a significant reactive force can be exerted <br /> on the pipe. With a pendent head, this reactive force can cause the pipe to <br /> lift vertically if it is not secured properly, especially if the sprinkler drop is from <br /> small diameter pipe.The pipe must be braced against the vertical lift-up with <br /> the closest hanger. Refer to the following illustration and Table A& S. <br /> A Hsu , ottg <br /> Brace/Support Brace/Support <br /> Finished Ceoting Lyne <br /> Table A- Maximum Support Spacing Distance <br /> End Line Sprinkler Head Drop Elbow <br /> Pipe Size Line Pressure 7inches(168,3 <br /> <100 psi <br /> 6�it�mirtal inches (<689kPa) <br /> 3/4(DN20) 9 inches (228,6 mm) m) <br /> 1 (DN25) 12 inches (304,8 mm) 9 inches (228,6 mm) <br /> 1-1/4 (DN32) 16 inches(406,4 mm) 12 inches (304,8 mm) <br /> L1-1=/2- (DN40 DN80) 24 inches (610,0 mm) 12 inches (304,8 mm) <br /> Note:Support spacing can be increased by approximately 50%for lower pressures. <br /> Table Maximum Support Spacing Distance <br /> Inline Sprinkler Neal Drop Tee <br /> Pipe Size Line Pressure Line Pressure <br /> <100 psi >100 psi <br /> Nominal inches (<689kPa) (>689kPa) <br /> 3/4 (DN20) 4 feet(1,22 meters) 3 feet*(0,91 meters) <br /> 1 (DN25) 5 feet(1,52 meters) 4 feet*(1,22 meters) <br /> 1-1/4 (DN32) 6 feet(1,83 meters) 5 feet*(1,52 meters) <br /> 1-1/2-3 (DN40 -DN80) 7 feet(2,13 meters) 7 feet(2,13 meters) <br /> Note:*Support spacing can be increased by one foot for lower pressures. <br /> FG-3-1010 0 2010 Spears"'Manufacturing Company Page 39 <br />