Figure 3-8. Plunger duster.
plunger duster should be used with the wand atop the tank; otherwise, the dust particles
will come out in large, coarse clumps. Maintenance of this piece of equipment consists
of keeping the duster dry by simply pumping out the contents into a storage container.
Water (or any other liquid) should never be put into the duster since the duster will rust
and any dust which remains inside it will clump.
3-3. POWER-OPERATED EQUIPMENT FOR DISPERSING LIQUIDS AND DUSTS
This sprayer is used for outdoor spraying, misting, or solid stream application (see
figure 3-10). It is often used for disperse fairly large volumes of wettable powder
suspensions, emulsions, or solutions. It is frequently used in spraying mosquito larval
breeding sites or in residual treatment beneath and around buildings. Recirculating
agitation is provided to keep wettable powders in suspension. This sprayer is very
useful in treating sanitary landfills and areas of turf. The hydraulic piston-pump sprayer
has a maximum output of 180 gallons per hour or 3 gallons per minute at 300 pounds
per square inch (psi). Insecticide is discharged at the spray gun nozzle and the spray
pattern is controlled by manual adjustment of the spray gun control handle.
Maintenance of the sprayer consists of the following steps.
Place suction and recirculating line into first rinse of 3-gallons flush
Start engine and adjust pressure to 300 psi.
Open main discharge valve.
(4) Open spray gun adjustment handle and rinse out spray lines. Continue
to rinse with two more containers of 3 gallons each. If liquid is of a type that will harden
or crystallize, flush the sprayer with ammonia and water and then with clear water.