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Operating, Calibrating, and Maintaining Spraying Systems
Lesson 5
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Next Generation Science / Common Core Science Standards Addressed
CCSS.ELA Literacy. RST.9‐10.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks, attending to special cases or exceptions defined in the text.
CCSS.ELA Literacy. RST.11‐12.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks; analyze the specific results based on explain HSSIC.
HSSIC.B.6 Evaluate reports based on data. (HS‐LS2‐6)
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Bell Work / Objectives
Identify the types of sprayers. Describe the selection of sprayers and
their components. Explain the operation of a sprayer. Describe the calibration of sprayers. Identify how sprayers are maintained.
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Terms
air sparging atomization control valves nozzles pressure gauge pump relief valve screens strainers
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Interest Approach
Have a student come to class wearing personal protective equipment and carrying a hand sprayer. Lead a discussion concerning pesticides, their application and safety associated with them.
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Types of sprayers Knapsack or back-pack sprayers Hand operated sprayers
– operate in 5 to 40 psi range– commonly used by home gardeners– 1 to 5 gallon in size and simple in design– pressure provided by hand operated air
pump– air is compressed in tank forces liquid out – small piston or diaphragm pump that is
powered by hand or small gasoline engine
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Types of Sprayers Low-pressure sprayers
– most widely used type of field applicators
– operated in 20 to 50 psi range
– applies 5 to 60 gallons per acre
– relatively inexpensive Controlled droplet
applicators
– apply low volumes of pesticide mixtures
– 1 to 3 gallons of spray mix per acre
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Types of sprayers High pressure sprayers
– similar to low pressure except capable of working with pressures of up to 1000 psi
– force spray through dense foliage or tops of trees
– single nozzle on a hand gun to large units with multiple nozzles
Air carrier– high speed air stream carries
pesticide to the surface being treated– capacities range 5,000 to 60,000
cubic feet per minute
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Types of sprayers
Air-boom sprayers– uses a blower to carry
small spray droplets into the target
– lowers volume of carrier used to better coverage and reduce drift
foggers– apply pesticides in very
fine droplets– commonly used in
confined spaces for insecticides
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Types of Sprayers Rope wick applicators
– apply liquid herbicides by wiping it onto the weeds
– pesticide is in a pipe and a rope acts as the wick bringing out chemical to plant
Direct injection systems– holds undiluted pesticide and
carrier in separate tanks– undiluted pesticide is metered
into nozzle line by pumps for blending with carrier
– eliminates need to mix chemical in spray tank
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Direct injection system!
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Objective #2
How are sprayers selected and what are their components?
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3 basic functions of sprayers
Storage of chemicals prior to application in the field.
Meter the quantity of material being applied.
Distribution of material into desired pattern.
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Sprayer selection factors
chemical being applied
application rate crop being treated required accuracy
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Sprayer components
Sprayer tanks– sufficient capacity– easy to fill and clean– be corrosive resistant– shape suitable for
mounting and agitation
agitator– maintain a uniform
mixture
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Agitation systems
Mechanical– propellers mounted on a shaft near bottom
of tank
hydraulic– returns a portion of the pump output to tank
air sparging– agitation by bubbling air through the liquid
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Sprayer components Pump
– moves liquid from the tank to the nozzles and creates pressure to produce droplets
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Types of pumps
Diaphragm pump– flexible diaphragm
that produces the pumping action
Centrifugal pump– creates a high
speed impeller that forces liquid out of pump
– not self priming
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Types of pumps
Piston pump– self-priming– pistons travel inside cylinders
and force liquid through one way valves
Metering pump– driven by ground wheel– ground speed changes so does
the pumping rate proportionately
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Types of Pumps
roller pump– cylindrical rollers that move in and out of slots in a
spinning rotor– as rotor spins creates space for liquid during half its
rotation– liquid is discharged from pumping chamber during
remainder rotation– self-priming– easy to repair– operate efficiently on PTOs
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Sprayer components
Relief valve– safety device that releases liquid when pressure
exceeds a safe level
pressure gauge– used to measure the pressure in the system and
valuable diagnosing tool
strainers and screens– used to remove particles from the system
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Screen & strainer locations
Tank screens– removes foreign materials when filling tank
line strainers– removes foreign materials from reaching
the pump
nozzle strainers– removes foreign material from clogging
nozzles
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Sprayer components
Pipes and hoses– convey the liquid through the sprayer system
sprayer frames– must be strong and durable– be able to attach the nozzles
control valves– used to start and stop the flow of liquid to the
nozzle
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Sprayer components
Nozzles– meter the liquid, atomize the liquid stream
into droplets, and disperse the droplets in a specified pattern
atomization– liquid breakup caused by the tearing action
of the air
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Sprayer nozzle patterns!
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Selection of nozzle type and size
Nozzle determines – amount of spray applied to
the area– uniformity of the application– the coverage of the sprayed
surface– amount of drift
flow rate depends on the effective size of the orifice and pressure
described according to the shape of the application pattern
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Nozzle types
Extended range flat fan– frequently used for soil and foliar
applications when better coverage is required
even flat-fan – apply uniform coverage across the
entire width of the spray pattern– only used for banding pesticides
over the row flooding flat-fan
– wide angle, flat fan pattern and are used for applying herbicides and liquid fertilizers
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Nozzle types
Turbo flood– combine the precision and
uniformity of extended range flat spray tips with the clog resistance and wide angle pattern of flooding nozzles
turbo flat-fan – improved pattern uniformity and
reduction of drift raindrop
– recommended when spray drift is a major concern
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Nozzle types
Wide-angle full cone– produces large
droplets over a wide range of pressures
drift reduction pre-orifice– reduce the
development of drift-able fines in the spray pattern
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Objective #3
How are sprayers operated?
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Guidelines to use when spraying
Decide is appropriate for use. Adjust and set sprayer based on label info. Calibrate sprayer Load the sprayer
– quantity of pesticide & procedure to follow while mixing pesticide
Transport loaded sprayers as little as possible Maintain constant ground speed & pressure Monitor for plugged nozzles and leaks
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Calibrating a sprayer
Proper calibration helps insure area being sprayed receives right amount of chemical
Variables nozzle flow rate ground speed width sprayed/nozzle
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Calibrating a sprayer
Gallons of spray / acre (GPA) = GPM X 5940 / MPH X W GPM = gallons per minute MPH = speed in miles per hour W = effective width sprayed per nozzle 5940 = constant to convert GPM, MPH, and
inches to GPA
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Selecting correct nozzle tip
Select spray application rate in GPA. Select proper ground speed. Determine effective width sprayed per nozzle. Determine flow rate in GPM. GPM = GPA X MPH X W / 5940 Select nozzle that will give flow rate needed
with the recommended pressure range.
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Calibrating a Sprayer
Calculate ounces per minute (OPM) to convert GPM to OPM GPM X 128 (1 gallon = 128 fluid ounces) Collect output from a nozzle in a container
marked in ounces
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Calibrating a sprayer
Determine amount of pesticide/herbicide, add the pesticide to partially filled tank of carrier, then add the carrier to desired level with continuous agitation.
Operate the sprayer at proper ground speed and pressure in tank.
Check nozzle flow rate frequently.
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Objective #5How are sprayers maintained?
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Maintaining a sprayer
Preventative maintenance will reduce chances of breakage, repair bills, & loss of time.
Adequate and timely adjustment, repair, lubrication, and protection from weather adds life to the sprayer.
Clean thoroughly inside and outside after each use and always wear protective clothing when cleaning.
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Review
What are the types of sprayers? How are sprayers selected and what
are their components? How are sprayers operated? What are the procedures to follow when
calibrating sprayers? How are sprayers maintained?
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The End!