The basic function of a sprayer
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The Basic Function of a Sprayer:. Distribution & Metering Apply a dilute amount of herbicide (Rate) in a determined volume of water (GPA) to a known area. . Application Methods. Broadcast. Multiple Nozzles Evenly spaced Equal Output. Even Pattern. Spot Treatment.

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The basic function of a sprayer l.jpg
The Basic Function of a Sprayer:

Distribution & Metering

Apply a dilute amount of herbicide (Rate) in a determined volume of water (GPA) to a known area.



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Multiple NozzlesEvenly spacedEqual Output

Even Pattern


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Spot Treatment


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Types of Spray Equipment--Spot Treatment --

ATV

Knapsack

Hand sprayer


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ATV’s?

What’s wrong with this picture?

Backpack and hand sprayers

What’s wrong with this picture?


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Calibrating a Backpack/Spray Gun

18 ½ x 18 ½

Ounces = GPA


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Standardize Pumping Pressure

http://www.rittenhouse.ca/

Nozzle Mount Pressure Regulator

$15.00 - $18.00



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Tanks

  • Fiberglass

  • Stainless steel

  • Galvanized steel

  • Aluminum

  • Polyethylene



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Agitation

50 GPM for agitation12 GPM for Boom62 GPM total pump requirement

Agitation Requirement5% of tank volume(5 GPM for each 100 gallons)

1000 gallon tank

Pump - 50 GPM just for agitation


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Strainers

  • Tank opening

    • Basket Strainer (16-80 mesh)

  • In-line (40-50 mesh)

  • Nozzle screen (50 - 100 mesh)


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PUMPS - must provide at least:

  • Gallons per minute (GPM) required by all nozzles

  • GPM - tank agitation (5 - 6 % of tank volume)


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Pump Types

  • Roller

  • Centrifugal

  • Gear

  • Turbine

  • Diaphragm

  • Piston


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Positive Displacement

  • General Purpose

  • Wide range

    • Output

    • Pressures

  • Herbicides

  • Rollers can wear

Roller Pump


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Non-positive Displacement

  • Continuous Flow

  • High RPM’s

  • Low Pressures

  • Durable

  • Easy to Maintain

  • Dry Formulations


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2000 m - #2 Pencil lead

850 m - paper clip

420 m – staple

300 m - toothbrush bristle

150 m - sewing thread

100 m - human hair

Comparison of Micron Sizes(approximate)


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What’s a good GPA?

Very Fine to Fine Droplet = Low Volume (GPA)

Medium to Coarse Droplets

Very Coarse = High Volume



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Three Functions of a Nozzle

  • Metering - GPA

  • Atomization – Liquid to drops

  • Pattern dispersal


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MAXIMIZING SPRAYER PERFORMANCE

  • Nozzle materials

    • Stainless steel, brass and plastic are the most common.

    • Stainless steel is probably the best choice



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VOLUME OF PESTICIDE SOLUTION APPLIED DEPENDS UPON:

  • NOZZLE TIPS - GPM

  • PRESSURE –Consistent, prevent drift

  • SPEED - MPH

  • NOZZLE SPACING - Uniformity


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Nozzle Types

Flat fan - regular

Flat fan - extended range

Twin flat fan - good for

dense foliage



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Nozzle types

Even flat fan - band applications

Flooding flat fan

Hollow cone

Full cone



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BOOM BUSTERSPRAY NOZZLES THAT WORK WITHOUT BOOMS

  • FEATURES

    • Machined from solid stainless steel. 

    • Replaceable nylon diffusers.



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Boom Buster (con’t)

  • Extra wide spray pattern.

  • Excellent pattern and distribution.

  • All models spray chemicals and fertilizers.

  • All nozzles have standard pipe threads.


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HOW TO CHANGE SPRAYER OUTPUT

  • NOZZLES

    • Best for large changes in output


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HOW TO CHANGE SPRAYER OUTPUT

  • Pressure

    • Only feasible within a limited pressure range

    • Pressure must be increased by a factor of 4 in order to double the flow

    • 10 GPA at 20 PSI

    • 20 GPA at 80 PSI


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HOW TO CHANGE SPRAYER OUTPUT

  • SPEED

    • Only feasible within a limited range of speeds


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Ground Speed

  • Cut speed by ½ =doubles output.

Double ground speed decreases output by ½



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