File:Chemical weed-control equipment (1948) (20416463928).jpg

Title: Chemical weed-control equipment
Identifier: chemicalweed389akes (find matches)
Year: 1948 (1940s)
Authors: Akesson, Norman B. (Norman Berndt), 1914-; Harvey, W. A. (William Alfred), 1914-1989
Subjects: Weeds; Spraying; Spraying equipment
Publisher: Berkeley, Calif. : University of California, College of Agriculture, Agricultural Experiment Station
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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have a total width approximately equal to one half the length of the tank, and their length should be sufficient to sweep within % inch of the tank bottom. For example, four blades, each 8 inches wide, would be used in a tank 60 inches long. The blade peripheral speed should be be- tween 300 and 400 feet per minute, or 95 to 128 rpm for a 12-inch blade in a 3-foot diameter, 250-gallon tank. t t t Hydraulic Agitation Hydraulic agitation requires no mov- ing parts in the spray tank, and is readily installed. A centrifugal pump is generally used with this system because of the high discharge volume needed. The excess flow at boom pressure is recirculated to the spray tank and forced out through many small openings in a 1- or 2-inch pipe laid in the tank bottom. The holes may be fitted with nozzles, if desired, which pro- vide replaceable wearing surfaces. This method of agitation is satisfactory if suffi- cient recirculation is used. The discharge from the jets should not strike the walls or bottom of the tank through less than The same length blade in a deeper tank should be operated at a higher speed. The power requirement to drive the agita- tor increases with the height of the liquid above the paddles. For the example given above, % to % hp is required. If a flat- bottom tank is used, the rpm of the agita- tor must be increased 20 per cent; and the power required will be increased 50 per cent. 1 foot of liquid. If it does, the continuous action of the liquid, especially of one con- taining abrasives, will remove the enamel lining and, in time, may wear out the tank. No accurate data are available as to the amount of hydraulic agitation flow required for various spray mixes and tank shapes. However, experience indi- cates that approximately 30 gpm at 100 psi should be provided for a 3-foot diam- eter, round-bottom, 250-gallon tank. Flat- bottom tanks should have 30 to 40 per cent more agitation. Power requirement ranges from 3 to 4 hp for a tank of these dimensions.
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Sprayers with tanks up to 800 gallons capacity may be supported on large bus or airplane wheels. This spray rig uses airplane balloon tires. (17)

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