APPENDIX
B
: Section Widths 109
APPENDIX B
CALIBRATION VALUES
SECTION WIDTHS
Use the following formulas to help calculate the section widths.
Calculate the section width with the formula:
Where T = the number of Tips in each section, S = the Spacing between tips, and SW = the Section Width.
FOR EXAMPLE:
7 tips in a section with spacing of 20 inches [50.8 cm] would yield:
7 X 20 =140
or a Section Width of 140 inches [356 cm]. Enter 140 [356] as the width for this section. (EQ 1)
TARGET RATE CALIBRATION
The following information must be known in order to determine which spray nozzles to use with the sprayer:
• Nominal Application Pressure_________ PSI [kpa]
• Target Application Rate_________ GPA [L/ha]
• Target Speed_________ MPH [kph]
• Nozzle Spacing_________ inches [cm]
From this information, calculate the volume per minute per nozzle as follows:
NVPM = Nozzle Volume per Minute (Gal/Min [L/Min]), Rate = Target Application Rate, Speed = Target Speed of
Application, and NS = Nozzle Spacing.
FOR EXAMPLE:
Application Pressure = 30 PSI, Target Application Rate = 20 GPA, Target Speed = 5.2 MPH, and Nozzle Spacing
= 20 inches
Using the calculated nozzle volume per minute of 0.35 at an application pressure of 30, select a boom nozzle
which comes closest to providing the desired output.
NVPM
Rate Speed× NS×
5 940 60 000,[],
--------------------------------------------------
=
NVPM
20 5.2× 20×
5 940,
------------------------------- -
0.35==
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