Useful Formulas

 

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
(MPH)

        =  

    Distance (FT) x 60   

       OR       

Speed
(km/h)

  =  

Distance (m) x 3.6

 Time (seconds) x 88

Time (seconds)


Speeds

Speed in
MPH

Time Required in SECONDS
to Travel a Distance of:

Speed in
km/h

Time Required in SECONDS
to Travel a Distance of:

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




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