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Drift-Reducing Nozzles. Rich Affeldt Extension Crop Scientist Jefferson County Acknowledgment: Dr. Tom Wolf, Agri-Food Canada Dr. Bob Wolf, Kansas State University Mark Mellbye, OSU Extension. Quick review: Nozzles Are Labeled by Spray Angle and Output. An 8002 is? 80 0 And? - PowerPoint PPT Presentation
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Drift-Reducing NozzlesRich Affeldt
Extension Crop ScientistJefferson County
Acknowledgment:Dr. Tom Wolf, Agri-Food Canada
Dr. Bob Wolf, Kansas State UniversityMark Mellbye, OSU Extension
Quick review: Nozzles Are Labeled by Spray
Angle and Output• An 8002 is?
• 800
• And?
• 0.2 gpm at 40 psi.
Choosing nozzles is usually a balance between coverage and drift potential.
Nozzle Types
Conventional Flat Fan (XR)
• Proven• Wide pressure
range• Potential for drift
Drift Reduction – Pre-Orifice
TeeJet DGDrift
GuardTurbo TeeJet
Turbo FloodJet
Drift Guard (DG)
• Pre-orifice chamber reduces internal nozzle pressure
• 30-60 psi creates similar amount of fines as normal flat fan at 15-25 psi
• Higher pressure prevents tailing-off at ends of boom Flat Fan Drift
Guard
Turbo TeeJet (TT)
• Pre orifice turbulence chamber
• Wide angle, flood-type, 15-90 psi
• Medium to coarse droplets
Turbo TeeJet (TT)
15 20 30 35 45 50 60 65 75 80 85 95 100TT 11001 C M M M M F F F F F F F FTT 110015 C C M M M M M M F F F F FTT 11002 VC C C C M M M M M M F F FTT 11003 VC C C C C M M M M M M M MTT 11004 XC VC C C C C C C M M M M MTT 11005 XC XC VC C C C C C C C C C M
Pressure (psi)
Air Induced (Venturi-type)• Venturi chamber
mixes air with spray solution
• Coarse droplets with few fines
• Not like conventional nozzles at low pressure
Air Induced (Venturi-type)
• Be aware of:– Differences in pressure operating range– Ease of cleaning– Ability to fit into existing nozzle caps
• Eight brands available in North America
TeeJet Air Induction
• Other similar designs
• Stainless steel tip• Available even fan• 40-100 psi
– Best from 60-80 psi
• Requires special cap
Greenleaf TurboDrop
• Most proven• 30-150 psi
– Best from 60-80
• TurboDrop XL– Lower pressure
version
Greenleaf AirMix
• Relatively new• Lower pressure
than most venturi-type– 15-90 psi– Best from 25-60 psi
New release in 2007:
• XR outlet with venturi air aspirator design
• More compact than AI style• 2-piece with removable pre-
orifice
AI XR TeeJet
Next Generation Air Induction Nozzles:
• More compact• Larger drops• Operates at lower pressures• Percentage of fines do not
increase with pressure
Turbo Injection - TTI
Next Generation Air Induction Nozzles:
• More consistent droplet• All-in-one cap and screen• Wide angle with 20 degree
incline• Aim forward or backword
Guardian
Volume Median Diameter
Nozzles-Recommended Use
40 psiXR nozzle
70 psi AI nozzle
Comparison with Greenleaf venturi type
% spray < 100 micron
s0
5
10
15
XR TT Venturi
40 psiAbout
2%
Comparison with Greenleaf venturi type
% spray < 100 micron
s0
5
10
15
20
XR TT Venturi
60 psi
30 psi
2%
Nozzle Summary
1. Conventional (XR) Proven, wide pressure range, drift prone
2. Pre-orifice (DG, TT) Proven, higher pressures, 50% less drift
3. Low-Pressure Air Induced (“venturi”)Reasonable press., more water, 50-70% less drift
4. High Pressure Air Induced (“venturi”)Higher press, more water, 70-95% less drift
Twin Jet Nozzles
• Often marketed for “better canopy penetration”
• Research at KSU in soybean showed less canopy penetration than a single orifice nozzle
Calibration!!!!The next phase!
Ensuring that the spray droplet spectrum is what it is supposed to be to maximize
efficacy while minimizing drift!
Volume Median Diameter
Source: Crop Life – July 2002
>150
151-250
251-350
351-450
451-550
>551
Droplet Selection/Calibration:
Droplet Spectra Classification*
Greenleaf Droplet chart:
Volume Median Diameter (VMD)
050
100150200250300350400450500
11004XR 11004TT TF 2 11003AI
Mic
rons
Water RWM + 2%AMSRWM + 1% AMS + Array RWM + 2% AMS + BorderRWM + 2% AMS + Placement
40 psi 40 psi 40 psi 70 psi
% less than 210 Microns
37 51 36 35 45 23 30 14 15 26 19 22 14 13 22 10 17 29 29 15
Bob Klein, U of Nebraska
Percent fines
On the Internet
• http://agbiopubs.sdstate.edu/articles/FS919.pdf– Summary of drift reducing nozzles
• www.bae.ksu.edu/faculty/wolf/– A leading expert on nozzle technology
• http://www.teejet.com• http://www.turbodrop.com/
– http://aandlsupply.com• Regional supplier of GreenLeaf nozzles
VariTarget:
• Speed variations from 2-20 MPH• Application rates of 5-40 GPA• Variable area pre orifice• Variable area spray orifice• Optimize spray droplet size• Maintain efficacy and minimize drift
www.spraytarget.com