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Spray Droplet Size Standard S-572 PowerPoint PPT Presentation


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Spray Droplet Size Standard S-572. Robert E. Wolf Extension Specialist Application Technology. Biological and Agricultural Engineering. Efficacy and Drift Potential is Influenced by. Size of the Spray Droplets - Volume Median Diameter (VMD) Droplet Spectrum (Range - big to small).

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Spray Droplet Size Standard S-572

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Spray droplet size standard s 572 l.jpg

Spray Droplet Size StandardS-572

Robert E. Wolf

Extension Specialist Application Technology

Biological and Agricultural Engineering


Efficacy and drift potential is influenced by l.jpg

Efficacy and Drift Potential is Influenced by

  • Size of the Spray Droplets -

    Volume Median Diameter (VMD)

  • Droplet Spectrum (Range - big to small)

% Volume in droplets less than

200 microns in size


Relationship of drift to drop size l.jpg

Relationship of Drift to Drop Size

One micron (m) =1/25,000 inch


Comparison of micron sizes for various items approximate values l.jpg

pencil lead 2000 (m)

paper clip 850 (m)

staple 420 (m)

toothbrush bristle 300 (m)

sewing thread150 (m)

human hair100 (m)

Comparison of Micron Sizes for Various Items: (approximate values)

150


Slide5 l.jpg

1/2 of spray volume = smaller droplets

VMD

1/2 of spray volume = larger droplets


Cutting droplet size in half results in eight times the number of droplets l.jpg

Cutting Droplet Size in HalfResults in Eight Times the Number of Droplets

250

Microns

250

Microns

500

Microns

250

Microns

250

Microns

250

Microns

250

Microns

250

Microns

250

Microns


Important droplet statistics l.jpg

Important Droplet Statistics

VMD

(50%)

Operational Area

VD0.1

(10%)

VD0.9

(90%)


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Evaporation of Droplets

High Relative Humidity

Low Temperature

Low Relative Humidity

High Temperature

Fall Distance

Wind


Epa requested changes coming l.jpg

Guidance to Chemical Manufacturers

Match the crop protection product to the target

Adhere to label guidelines based on an industry standard

ASAE S-572

Buffer Zones or No Spray Zones

Maximize Efficacy

Minimize Drift

Example Reference Graph

900

800

very fine/ fine

fine/medium

medium/ coarse

coarse/ very coarse

700

very coarse/ extremely coarse

600

XC

500

C

VC

400

M

300

F

200

Drop Size (microns)

VF

100

0

0.1

0.5

0.9

Cumulative Volume Fraction

EPA Requested Changes Coming!?!?

VMD


Asae s 572 droplet size standard l.jpg

ASAE S-572 Droplet Size Standard


Origin of standardized spray droplet size categories l.jpg

Origin Of Standardized Spray Droplet Size Categories

  • 1985 -- British Crop Protection Council (BCPC)

    • Droplet size classifications, primarily designed to enhance efficacy.

    • Uses the term SPRAY QUALITY for droplet size categories.

      2000 -- ASAE Standard S572

    • Droplet size classifications, primarily designed to control spray drift.

    • Uses the term DROPLET SPECTRA CLASSIFICATION for droplet size categories.


Specifics of the standard l.jpg

Specifics of the Standard

  • Based on spraying water through reference nozzles.

  • Nozzle manufacturers can conduct the tests.

  • Must use a set of reference tips and a laser-based instrument.

  • Droplet Spectra measurements must be with the same:

    • Instrument, measuring method, sampling technique, scanning technique, operator, and in a similar environmental condition.


Coverage l.jpg

Coverage

  • Need knowledge of the product being used.

    • Systemic

    • Contact

  • What is the target?

    • Soil

    • Grass

    • Broadleaf (smooth, hairy, waxy)

    • Leaf orientation – time of day


Asae dsc and volume median diameter d v0 5 from pms laser spectrometer l.jpg

ASAE DSC and Volume Median Diameter (DV0.5) From PMS* Laser Spectrometer

Droplet Spectra

Classification (DSC)

Droplet Size

Range

  • Very Fine (VF) < 182µm

  • Fine (F)183-280µm

  • Medium (M)281-429µm

  • Coarse (C)430-531µm

  • Very Coarse (VC) 532-655µm

  • Extremely Coarse (XC) >656µm

*USDA ARS College Station, TX


Nozzle technology how to use l.jpg

Nozzle Technology? How to use??

  • Nozzles designed to reduce drift

  • Improved drop size control

  • Emphasis on ‘Spray Quality’


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Spray Characteristics are Important to Understand:

Demonstrates Turbo Flat vs TurboDrop-5 MPH Wind


Nozzles types l.jpg

Nozzles Types?


Extended range flat fan l.jpg

Extended Range Flat-fan:

  • Tapered edge pattern

  • 80 and 110 degree fan

  • Requires overlap - 50 to 60%

  • 15-60 psi range


Extended range flat fan20 l.jpg

Extended Range Flat-fan:

  • Tapered edge pattern

  • 80 and 110 degree fan

  • Requires overlap - 50 to 60%

  • 15-60 psi range

80°

110°


Slide21 l.jpg

Demo


Nozzles types22 l.jpg

Nozzles Types?


Turbo flat fan l.jpg

Turbo Flat-fan:

  • Turbulence chamber as in the Turbo Flood

  • Tapered edge, wide angle flat pattern

  • Designed to work in flat-fan nozzle holder

  • Uniform spray distribution, 50-60% overlap

  • Wide pressure range, 15 – 90 psi

  • Large, drift resistant droplets

  • Plastic with superior wear characteristics


Turbo flat fan24 l.jpg

Turbo Flat-fan:

  • Turbulence chamber as in the Turbo Flood

  • Tapered edge, wide angle flat pattern

  • Designed to work in flat-fan nozzle holder

  • Uniform spray distribution, 50-60% overlap

  • Wide pressure range, 15 – 90 psi

  • Large, drift resistant droplets

  • Plastic with superior wear characteristics

XR

TT


Slide25 l.jpg

Demo


Nozzles types26 l.jpg

Nozzles Types?


Slide27 l.jpg

Air-Induction/Venturi Nozzles

Where air is drawn into the nozzle cavity and exits with the fluid.


Air induction venturi nozzle l.jpg

Air/Induction – Venturi Nozzle:

  • Spraying Systems AI TeeJet

  • Air intake venturi section

  • Mixing Chamber - air and spray solution blended

  • Exit orifice - Pattern tip - forms large air-bubble drops

  • Better Penetration?

  • Reduced run-off?

  • Improved coverage?

  • Adequate efficacy?

  • Reduced drift? YES!!!


Xr flat fan and turbo flat fan compared to venturi style 5 0 mph wind at 40 psi l.jpg

XR Flat-fan and Turbo Flat-fan compared to Venturi Style 5.0 MPH wind at 40 psi

XR vs TurboDrop

Turbo Flat vs Turbo Drop


Slide30 l.jpg

Demo


Driftable droplets spraying systems 2000 l.jpg

Driftable Droplets: Spraying Systems-2000


Slide33 l.jpg

Page 4


Computer models l.jpg

Computer Models:


Agdrift program map l.jpg

AgDRIFT® Program Map


Example of model use aerial applicators standard operation l.jpg

Example of Model Use – Aerial Applicators Standard Operation


For more information contact l.jpg

For more information contact:

[email protected]

www.bae.ksu.edu/rewolf/


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