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• <br /> Crone Eigh School Drawinc Dote:02/23/1H 4/30/18 11 :22 <br /> HYDRAULIC CALCULATION DETAILS <br /> HYDRAULIC FLOW LOSS <br /> QTY DESCRIPTION LENGTH C ID gpm psi TOTALS <br /> Hydr Ref N Required at Hyd Area 2 259 52. 8 psi <br /> 1 4" Grvd Butterfly Valve Tyco BFV- 5' 120 4 .026 259 0. 1 <br /> 1 4" Thrd Back. Flow Valve WATTS 774 CHART LOSS 259 2 . 4 <br /> Elevation Change -1110" -5. 1 <br /> Fixed Flow Inside Hose Stream 0 gpm <br /> Hydr Ref R1 Required at Base of Riser 259 50.1 psi <br /> 1 Pipe 6" D1x18 America DI 350 300' 140 6.338 259 0. 5 <br /> Fixed Flow Outside Hose Allow. 250 gpm <br /> Hydr Ref R2 Required at City Supply 509 50 . 6 psi <br /> Water Source 58.7 psi static, 52.7 psi residual @ 1190 gpm 509 gpm 57.4 psi <br /> SAFETY PRESSURE 6.8 psi <br /> NOTE: Water Source has been adjusted. to include a change of elevation of <br /> 1' 6" flow test to point of connection <br /> Available Pressure of 57.4 psi Exceeds Required Pressure of 50.6 psi <br /> This is a safety margin of 6.8 psi or 12 % of Supply <br /> Maximum Water Velocity is 11.8 fps <br />