. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. A hydro-pneumatic sprayer such as this may be used for field weed spraying or for applying oil sprays on weeds in citrus orchards. Spray liquid is carried in a pressure-tight tank, and does not pass through a pump. A compressor forces air into the tank, and the liquid is in turn forced out through the spray nozzles. If the air compressor has an adequate filter to protect it from dust, it will stand aver- age usage with little wear. The sprayer shown here has a mechan- ical agitator, which enables the equip- ment to be used
. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. A hydro-pneumatic sprayer such as this may be used for field weed spraying or for applying oil sprays on weeds in citrus orchards. Spray liquid is carried in a pressure-tight tank, and does not pass through a pump. A compressor forces air into the tank, and the liquid is in turn forced out through the spray nozzles. If the air compressor has an adequate filter to protect it from dust, it will stand aver- age usage with little wear. The sprayer shown here has a mechan- ical agitator, which enables the equip- ment to be used with all kinds of sprays. Some models provide a bubbling type of agitation by means of an air-discharge tube inside the tank, but this can only be used with mixtures which are easily kept in suspension. Power,,, All pumps, except the simple, hand- operated ones, are run by an engine. If the pump and engine are bought sepa- rately, it is necessary to decide first on the size of the pump. This, in turn, will depend upon the maximum discharge that will be required of the sprayer. Each type of pump will carry information showing the pressure per square inch NOTE: This type sprayer is limited to relatively small sizes because large pressure tanks are both expensive and heavy. Large air compressors are also expensive—they cost almost as much as reciprocating high-pressure spray pumps. Compressors are generally rated in cubic feet per minute volume at atmos- pheric (app. 15 psi) pressure. To con- vert to normal operating pressures (100 psi, for example), the relation Pt Y1 = P2 V2 is used, where the subscript 1 denotes the pressure and volume at atmospheric (or given) conditions, and the 2 is for the pressure and volume under the re- quired conditions. One cubic foot per minute at the desired pressure will then equal gallons per minute discharged. produced at various discharge rates (in gallons per minute). The engine must be large enough to run the pump at full capacity. It is
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Keywords: ., bookcentury1900, bookpubli, booksubjectspraying, booksubjectweeds
