Alan Dexter
Sugarbeet Weed Control Specialist
Sugarbeet Weed Control Specialist The designation on the teejet nozzles has a specific meaning. The first two numbers indicate the spray angle. An 8001 nozzle has an 80 degree spray angle at 40 psi. The second two numbers indicate the capacity of the nozzle. An 8001 nozzle would deliver 0.1 gallons per minute (gpm) of water at 40 pounds per square inch pressure (psi). The E following the numbers means that the nozzle is an even spray nozzle and can be used for banding. The Delavan nozzle that is equivalent to the 8001E Teejet nozzle is the LE-1 80%. The LE-1 80% is an even spray nozzle with 0.1 gpm capacity and 80% spray angle at 40 psi. The Delavan LF-1 25% listed in the table is a flat spray nozzle and flat spray nozzles should not normally be used for banding. However, when the spray angle of a Delavan nozzle is as narrow as 25 degrees, then the spray pattern approach an even spray nozzle and therefore can be used for banding. The narrow angle nozzles must be positioned quite high for a 5 inch band and the spray particles would be more susceptible to drift. The Spraying Systems TZ and the Delavan HC nozzles are hollow cone nozzles. The HC-6 45% and the TZ-6 nozzles will deliver 6 gallons per hour (gph). The HC-6 45% nozzle has a 45% spray angle and the TZ-6 has a 50% spray angle at 40 psi. Please note that the number on the hollow cone nozzles indicate gallons per hour and the number on the flat fan nozzles indicate gallons per minute. Thus the HC-6 and TZ-6 nozzles have the same delivery as the 8001E, LE-1 80%, or 4001E nozzles.
Spraying Systems recently developed a narrow angle flat fan even spray nozzle for band application. The example in the table is the 4001E. This nozzle has a 40% spray angle and delivers 0.1 8 pm at 40 psi.
Double nozzle sprayers
Band sprayers with two nozzles per row are currently available. The two nozzles
generally spray towards one another at approximately 45% from vertical. The nozzles are
arranged over the row rather than at the aides of the row.
Hollow cone nozzles in a vertical position can be used for band application because they produce a spray pattern that is fairly uniform from edge to edge. However, when a hollow cone nozzle is angled from vertical, the spray pattern becomes heavy in the center and light at the edges. Hollow cone nozzles should not be used in the double nozzle band sprayers since two hollow cone nozzles turned at a 45% angle from vertical produce a spray pattern which is not uniform from edge to edge. Two angled flat fan band application nozzles (Table 1) produce a more uniform pattern than two angled hollow cone nozzles in the double nozzle sprayers.
Tables 2 and 3 do not contain all the possible nozzle sizes, spray pressures, band widths, row widths, and operating speeds. The following formulas and examples may be useful in obtaining answers for situations not covered in Tables 2 and 3.
1979 Sugarbeet Research and Extension Reports, Volume 10, Pages 43-46
