TM 5-3740-218-13&PThe variables of 1-1000 psi have been put in this formula and calculated out. The conversion factor is necessary to putinto the formula since all nozzle flows in the charts are given for 30 psi. Any deviation from 30 psi requires a conversionnumber in the formula to correct the flow rate.Example No. 1: An application requires 12 gallons per acre at 60 mph with nozzles spaced every 8 inches on the sprayboom. The operator expects the psi to be around 35. What nozzles can be used that would be close to thisrequirement?GPM/NOZat 30 PSI = GPA x MPH x Nozzle Spacing5940 x Conversion Number for New PSIGPM/NOZat 30 PSI = 12x60x85940 x 1.08Answer: Nozzles that will deliver close to 0.897 gpm at 30 psi are:D 10-450.94D 6-560.95D 14-250.88Example No. 2: A grower has an orchard sprayer with 32 nozzles and will travel at 80 mph. The swath width is 50 feet.The grower plans to apply 16 gpa at 40 psi. What nozzle will perform to this application?GPM/NOZat 30 PSI = GPA x MPH x SW# NOZx 495 x Conversion Number for New PSIGPM/NOZat 30 PSI = 8 x 60 x 5032 x 495 x 1.00Answer: Nozzles that will deliver close to 1.51 gpm at 30 psi are:D 14-451.54D 8-461.59D 81.50G-3.SYSTEM CALIBRATIONThree possible methods will be discussed that can be used to calibrate the system:a.Flow Checks. The only method to calibrate a system before it leaves the ground is to time a given load of water.With the hydraulic driven pumps, the following formula can be applied:TIME/Load= 495 x # Gal/Load# of Gal/Acre x SW x MPH=0.897= 1.51G-2
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