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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

Spray Droplet Size StandardS-572

Robert E. Wolf

Extension Specialist Application Technology

Biological and Agricultural Engineering

efficacy and drift potential is influenced by
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
Relationship of Drift to Drop Size

One micron (m) =1/25,000 inch

comparison of micron sizes for various items approximate values
pencil lead 2000 (m)

paper clip 850 (m)

staple 420 (m)

toothbrush bristle 300 (m)

sewing thread 150 (m)

human hair 100 (m)

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

150

slide5

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
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
Important Droplet Statistics

VMD

(50%)

Operational Area

VD0.1

(10%)

VD0.9

(90%)

evaporation of droplets
Evaporation of Droplets

High Relative Humidity

Low Temperature

Low Relative Humidity

High Temperature

Fall Distance

Wind

epa requested changes coming
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

origin of standardized spray droplet size categories
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
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
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
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
Nozzle Technology? How to use??
  • Nozzles designed to reduce drift
  • Improved drop size control
  • Emphasis on ‘Spray Quality’
spray characteristics are important to understand
Spray Characteristics are Important to Understand:

Demonstrates Turbo Flat vs TurboDrop-5 MPH Wind

extended range flat fan
Extended Range Flat-fan:
  • Tapered edge pattern
  • 80 and 110 degree fan
  • Requires overlap - 50 to 60%
  • 15-60 psi range
extended range flat fan1
Extended Range Flat-fan:
  • Tapered edge pattern
  • 80 and 110 degree fan
  • Requires overlap - 50 to 60%
  • 15-60 psi range

80°

110°

turbo flat fan
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 fan1
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

slide27

Air-Induction/Venturi Nozzles

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

air induction venturi nozzle
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
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

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