spray nozzle selection and operation · spray nozzle selection and operation . dan martin . usda...
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Spray Nozzle Selection and Operation
Dan Martin USDA ARS
Aerial Application Technology Group College Station, Texas
Why the Concern?
• Application rate is on the label
• Application rate can affect coverage and efficacy
• Droplet spectrum can affect efficacy and drift potential
Optimum Droplet Spectrum for Various Pesticide Classes
How to Calculate Flowrate
• You know the effective swath of your plane.
• You know the speed you want to fly.
• You know the application rate.
• From this, we can calculate total flowrate and the number of nozzles needed.
How to Calculate Flowrate
How to Calculate Flowrate
• Now we need to calculate the flowrate per nozzle
• Assume we have 45 nozzles
How to Calculate Flowrate
How to Select Orifice and Pressure
How to Select Orifice and Pressure
How to Select Orifice and Pressure
How to Select Orifice and Pressure
How to Determine Spray Quality
How to Determine Spray Quality
How to Determine Spray Quality
How to Determine Spray Quality
How to Determine Spray Quality
Let’s Change Airspeed
Total Boom Output Flowrate (GPM) =
Application Rate(GPA) x Swath Width(ft) x Speed(MPH)495
2 𝐺𝐺𝐺 𝑥 65 𝑓𝑓 𝑥 140 𝑀𝐺𝑀
495
Re-Calculate Flowrate
Re-Calculating Flowrate
Selecting Orifice and Pressure
Selecting Orifice and Pressure
Determining Spray Quality
Determining Spray Quality
Determining Spray Quality
Determining Spray Quality
How to Determine Spray Quality
Determining Spray Quality
Determining Spray Quality
Determining Spray Quality
Determining Spray Quality
Take Home
• Flowrate and Droplet Spectrum are important to your equipment setup.
• Using readily available online tools, they can be optimized for your operation.
• They can affect deposition, efficacy and drift potential.
Take Home
• Consider creating a reference document for pilots and loaders that highlights equipment setups.
Take Home
Rate (GPA) DSC Nozzle Deflection (º)
Speed (MPH)
Orifice Pressure (PSI)
2.0 Fine CP-11TT 45 145 #8 35
2.0 Medium CP-11TT 15 145 #8 35
2.0 Coarse CP-11TT 0 145 #8 35
What to look for
Questions?
39