|
GPM |
= |
GPA x MPH x W |
|
(per nozzle) |
5,940 |
| OR |
|
l/min |
= |
l/ha x km/hr x W |
|
(per nozzle) |
60,000 |
|
GPM |
= |
GAL/1000FT2 x MPH x W |
|
(per nozzle) |
136 |
| OR |
|
GAL/1000FT2 |
= |
136 x GPM (per nozzle) |
|
MPH x W |
|
GPA |
= |
5,940 x GPM (per nozzle)
|
|
MPH x W |
| OR |
|
l/min |
= |
60,000 x l/min (per nozzle) |
|
km/hr x W
|
|
GPM |
= | Gallons per minute |
| GPA | = | Gallons per acre |
| GAL/1000FT2 | = | Gallons per 1000 square feet |
| MPH | = | Miles per hour |
| W | = | Nozzle spacing (in inches or cm) for broadcast spraying |
| = | Spray width (in inches or cm) for single nozzle, band spraying or boomless spraying |
|
| = | Row spracing (in inches or cm) divided by the number of nozzles per row for directed spraying |
Formulas for Roadway Applications
|
|
GPLM |
= |
60 x GPM
|
OR |
l/min |
= |
60 x l/min |
|
MPH |
km/hr
|
|
|
GPM |
= |
GPLM x MPH
|
OR |
l/min |
= |
l/lkm x km/hr |
|
60 |
60
|
|
GPLM |
= | Gallons per lane mile |
| l/km | = | Liters per lane kilometer |
Note: GPLM (l/km) is not a normal volume per unit area measurement. It is a volume per distance measurement. Increases or decreases in lane width (swath width) are not accommodated by these formulas.
Measuring Travel Speed
Measure a test course in the area to be sprayed or in an area with similar surface conditions. Minimum lengths of 100 and 200 feet (30 and 60 meters) are recommended for measuring speeds up to 5 and 10 mph (8 and 14 km/h), respectively. Determine the time required to travel the test course. To help ensure accuracy, conduct the speed check with a partially loaded (about half full) sprayer and select the engine throttle setting and gear that will be used when spraying. Repeat the above process and average the times that were measured. Use the following equation or tables below to determine ground speed.
|
|
Speed |
= |
Distance (FT) x 60
|
OR |
Speed |
= |
Distance (m) x 3.6 |
|
Time (seconds) x 88 |
Time (seconds)
|
Speeds
|
Speed in |
Time Required in SECONDS |
Speed in |
Time Required in SECONDS |
|||||
|
100 Feet |
200 Feet |
300 Feet |
30 m |
60 m |
90 m |
120 m |
||
|
1.0 |
68 |
136 |
205 |
5 |
22 |
43 |
65 |
86 |
|
1.5 |
45 |
91 |
136 |
6 |
18 |
36 |
54 |
72 |
|
2.0 |
34 |
68 |
102 |
7 |
15 |
31 |
46 |
62 |
|
2.5 |
27 |
55 |
82 |
8 |
14 |
27 |
41 |
54 |
|
3.0 |
23 |
45 |
68 |
9 |
— |
24 |
36 |
48 |
|
3.5 |
19 |
39 |
58 |
10 |
— |
22 |
32 |
43 |
|
4.0 |
17 |
34 |
51 |
11 |
— |
20 |
29 |
39 |
|
4.5 |
15 |
30 |
45 |
12 |
— |
18 |
27 |
36 |
|
5.0 |
14 |
27 |
41 |
13 |
— |
17 |
25 |
33 |
|
5.5 |
— |
25 |
37 |
14 |
— |
15 |
23 |
31 |
|
6.0 |
— |
23 |
34 |
16 |
— |
14 |
20 |
27 |
|
6.5 |
— |
21 |
31 |
18 |
— |
— |
18 |
24 |
|
7.0 |
— |
19 |
29 |
20 |
— |
— |
16 |
22 |
|
7.5 |
— |
18 |
27 |
25 |
— |
— |
13 |
17 |
|
8.0 |
— |
17 |
26 |
30 |
— |
— |
— |
14 |
|
8.5 |
— |
16 |
24 |
35 |
— |
— |
— |
12 |
|
9.0 |
— |
15 |
23 |
40 |
— |
— |
— |
11 |