The handbook of Technical irrigaTion informaTion - Hunter Industries

Tables – Friction Factor ShortcutsFriction Factor Short Cuts for Class 160 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 160 PVC 27.4 27.9 28.3 28.8 29.2 29.6 30.0 30.41¼" CL 160 PVC 52.7 53.6 54.4 55.2 56.1 56.9 57.7 58.51½" CL 160 PVC 75.2 76.4 77.6 78.8 80.0 81.2 82.3 83.42" CL 160 PVC 135.3 137.5 139.6 141.8 143.9 146.0 148.0 150.12½" CL 160 PVC 223.5 227.1 230.7 234.3 237.8 241.2 244.6 248.03" CL 160 PVC 374.1 380.2 386.2 392.1 397.9 403.7 409.4 415.1Friction 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 160 PVC 30.9 31.3 31.7 32.1 32.4 32.8 33.2 33.61¼" CL 160 PVC 59.3 60.0 60.8 61.6 62.3 63.1 63.8 64.51½" CL 160 PVC 84.6 85.7 86.8 87.8 88.9 90.0 91.0 92.12" CL 160 PVC 152.1 154.1 156.0 158.0 159.9 161.8 163.7 165.62½" CL 160 PVC 251.3 254.6 257.8 261.1 264.3 267.4 270.5 273.63" CL 160 PVC 420.6 426.1 431.6 437.0 442.3 447.6 452.8 458.0Friction 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 160 PVC 34.0 34.3 34.7 35.1 35.4 35.8 36.2 36.51¼" CL 160 PVC 65.2 66.0 66.7 67.4 68.1 68.8 69.4 70.11½" CL 160 PVC 93.1 94.1 95.1 96.1 97.1 98.1 99.1 100.12" CL 160 PVC 167.4 169.3 171.1 172.9 174.7 176.5 178.2 180.02½" CL 160 PVC 276.7 279.7 282.7 285.7 288.7 291.6 294.5 297.43" CL 160 PVC 463.1 468.2 473.2 478.2 483.2 488.1 492.9 497.7Friction 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 160 PVC 36.9 37.2 37.6 37.9 38.2 38.6 38.9 39.21¼" CL 160 PVC 70.8 71.5 72.1 72.8 73.4 74.1 74.7 75.41½" CL 160 PVC 101.0 102.0 102.9 103.9 104.8 105.7 106.6 107.52" CL 160 PVC 181.7 183.4 185.1 186.8 188.5 190.1 191.8 193.42½" CL 160 PVC 300.2 303.1 305.9 308.7 311.4 314.2 316.9 319.63" CL 160 PVC 502.5 507.3 512.0 516.6 521.3 525.9 530.4 535.0*Note: ½" pipe is Class 315 PVC and ¾" pipe is CL 200 PVC because wall thickness must be at least 0.060" and Class 160 has a SDR of 26 which would resultin a wall thickness in ½" an ¾" pipe of less than 0.060".55