The handbook of Technical irrigaTion informaTion - Hunter Industries

Tables – Friction Factor ShortcutsFriction Factor Short Cuts for Class 200 PVC*Maximum GPM for Various Friction FactorsFriction Factor 8.25 8.50 8.75 9 9.25 9.50 9.75 10Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM½" CL 315 PVC 7.1 7.3 7.4 7.5 7.6 7.7 7.8 7.9¾" CL 200 PVC 14.2 14.4 14.7 14.9 15.1 15.3 15.5 15.81" CL 200 PVC 27.1 27.5 28.0 28.4 28.8 29.2 29.6 30.01¼" CL 200 PVC 50.0 50.8 51.7 52.4 53.2 54.0 54.8 55.51½" CL 200 PVC 71.4 72.6 73.7 74.9 76.0 77.1 78.2 79.32" CL 200 PVC 128.2 130.3 132.4 134.4 136.4 138.4 140.3 142.32½" CL 200 PVC 211.8 215.2 218.6 221.9 225.3 228.5 231.8 234.93" CL 200 PVC 354.9 360.7 366.4 372.0 377.6 383.0 388.4 393.8Friction Factor 10.25 10.50 10.75 11 11.25 11.50 11.75 12Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM½" CL 315 PVC 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7¾" CL 200 PVC 16.0 16.2 16.4 16.6 16.8 17.0 17.2 17.41" CL 200 PVC 30.4 30.8 31.2 31.6 32.0 32.4 32.8 33.21¼" CL 200 PVC 56.3 57.0 57.7 58.4 59.2 59.9 60.6 61.31½" CL 200 PVC 80.3 81.4 82.4 83.4 84.5 85.5 86.5 87.52" CL 200 PVC 144.2 146.1 147.9 149.8 151.6 153.4 155.2 157.02½" CL 200 PVC 238.1 241.2 244.3 247.3 250.4 253.4 256.3 259.23" CL 200 PVC 399.1 404.3 409.5 414.6 419.6 424.7 429.6 434.5Friction Factor 12.25 12.50 12.75 13 13.25 13.50 13.75 14Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM½" CL 315 PVC 8.8 8.9 9.0 9.1 9.2 9.3 9.4 9.5¾" CL 200 PVC 17.6 17.8 18.0 18.2 18.3 18.5 18.7 18.91" CL 200 PVC 33.5 33.9 34.3 34.6 35.0 35.3 35.7 36.01¼" CL 200 PVC 61.9 62.6 63.3 64.0 64.6 65.3 65.9 66.61½" CL 200 PVC 88.4 89.4 90.4 91.3 92.3 93.2 94.1 95.02" CL 200 PVC 158.8 160.5 162.2 163.9 165.6 167.3 169.0 170.62½" CL 200 PVC 262.1 265.0 267.9 270.7 273.5 276.3 279.0 281.73" CL 200 PVC 439.4 444.2 449.0 453.7 458.4 463.1 467.7 472.2Friction Factor 14.25 14.50 14.75 15 15.25 15.50 15.75 16Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM Max. GPM½" CL 315 PVC 9.6 9.7 9.8 9.9 10.0 10.0 10.1 10.2¾" CL 200 PVC 19.1 19.3 19.4 19.6 19.8 20.0 20.1 20.31" CL 200 PVC 36.4 36.7 37.1 37.4 37.7 38.1 38.4 38.71¼" CL 200 PVC 67.2 67.8 68.5 69.1 69.7 70.3 70.9 71.61½" CL 200 PVC 96.0 96.9 97.8 98.7 99.5 100.4 101.3 102.22" CL 200 PVC 172.3 173.9 175.5 177.1 178.7 180.3 181.8 183.42½" CL 200 PVC 284.5 287.1 289.8 292.4 295.1 297.7 300.2 302.83" CL 200 PVC 476.8 481.3 485.7 490.2 494.6 498.9 503.3 507.6*Note: ½" pipe is Class 315 PVC because wall thickness must be at least 0.060" and Class 200 has a SDR of 21 which would result in a wall thickness in½" pipe of less than 0.060".53