Product Manual

Appendix A – Broadcast Spray Application Tables
36
Below are some guidelines to calibrate a North Star boom sprayer with DT3.0 (777359)
spray nozzles. This is a very important step in operating the boom sprayer so the right
amount of chemical is applied.
1. Use the suggested application rate from the chemical manufacturer (i.e. gallons per Acre,
1000 sq.ft., or 100 sq.ft.)
2. Using Table 1, find the application rate that most closely matches the chemical
manufacturer’s suggested application rate and pressure at which the sprayer is operating.
3. Follow this application rate up the chart to find the speed at which to drive the vehicle.
TABLE 1
Spray
Pressure
Flow
GALLONS PER ACRE - based on 32 foot spray pattern
Height
(PSI)
(GPM)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
6 MPH
7 MPH
32”
20
1.7*
56
28
19
14
11
9
8
32”
30
2.0*
66
33
22
16.5
13
11
9.5
32”
40
2.5*
82.5
41
27.5
20.5
16.5
13.5
12
Spray
Pressure
Flow
GALLONS PER 1000 SQUARE FEET – based on 32 foot spray pattern
Height
(PSI)
(GPM)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
6 MPH
7 MPH
32”
20
1.7*
1.29
.64
.44
.32
.25
.21
.18
32”
30
2.0*
1.52
.76
.51
.38
.30
.25
.22
32”
40
2.5*
1.90
.94
.63
.47
.38
.31
.28
Spray
Pressure
Flow
GALLONS PER 100 SQUARE FEET – based on 32 foot spray pattern
Height
(PSI)
(GPM)
1 MPH
2 MPH
3 MPH
4 MPH
5 MPH
6 MPH
7 MPH
32”
20
1.7*
.129
.064
.044
.032
.025
.021
.018
32”
30
2.0*
.152
.076
.051
.038
.030
.025
.022
32”
40
2.5*
.190
.094
.063
.047
.038
.031
.028
* Approximate flow from one nozzle
4. Use Table 2 to choose the throttle setting on the vehicle.
TABLE 2
5. The coverage area can be found by dividing a full tank (ie; 55 gals) by the application rate.
Example: 55 gallons divided by 15 gallons/acre = 3.67 acres of coverage per tank.
Speed
Time required in seconds to travel a distance of:
(MPH)
100 ft.
200 ft.
300 ft.
1
68
136
205
2
34
68
102
3
23
45
68
4
17
34
51
5
14
28
41
7
9.5
19
29