TM 5-3740-218-13&PAPPENDIX GNOZZLE SELECTION AND SYSTEM CALIBRATIONG-1.SELECTING NOZZLES FOR CALIBRATIONTo properly select a nozzle, it must first be determined how many gpm each nozzle will have to put out. Once this isknown, the chart for nozzle selection will aid in finding a nozzle with the right gpm. The formula for finding thegpm/nozzle is:GPM/NOZ = GPAxMPHxSW# NOZx 495Example: An operator wants to fly on 10 gallons per acre and fly 50 mph. The spray boom has 58 nozzles and the swathwidth is 90 feet. How many gpm will each nozzle have to put out?GPM/NOZ = GPAxMPHxSW =10x50x90= 1.56 GPM/NOZ# NOZx 49558 x 495Answer: Each nozzle will have to put out 1.56 gpm/nozzle. By looking at the charts in the section for nozzle selection, aD-8 will meet this requirement. A D-8 equals 1.56 gpm/nozzle at 30 psi.G-2.NOZZLE SELECTIONThe basic idea of nozzle selection is to find a nozzle that will perform to the application in the psi range available.By listing all nozzle flows in gallons per minute at 30 psi, the job of nozzle selection can be simplified. With the followingformulas, nozzles can be selected from the Spraying Systems and DeLavan charts regardless of the pressure at whichthey will be used.GPM/NOZat 30 PSI = GPA x MPHx Nozzle Spacing5940 x Conversion Number for New PSIorGPM/NOZat 30 PSI = GPA x MPH x Nozzle Spacing495 x Conversion Number for New PSIorGPM/NOZ at 30PSI = GPA x MPH x SW# NOZx 495 x Conversion Number for New PSIThe PSI Conversion Numbers Chart is used to obtain the "conversion for new psi." The conversion number shouldcorrespond to the psi the nozzle will be performing at in its application.The conversion number represents the formula: new PSI = 30 PSIG-1
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