25
Useful Formulas and Conversions
GPA=
Application rate in gallon per acre
GPM=
Flow rate in gallons per minute
S=
Speed in miles per hour
W=
Nozzle spacing in inches
Calculate flow rate per nozzle when application rate, speed and nozzle spacing are known:
GPM (per Nozzle) = GPA x S x W
5940
Calculate application rate when nozzle spacing, speed and flow rate are known:
GPA = 5940 x GPM
S x W
Calculate speed when flow rate, application rate and nozzle spacing are known:
S = 5940 x GPM
GPA x W
Convert speed from feet per second to miles per hour:
S = Feet per second x 0.682
Spraying Solutions Other Than Water
Since all the tabulations are based on spraying water, which weighs 8.34 lbs. per US gallon, conver-
sion factors must be used when spraying solutions which are heavier or lighter than water. To
determine the proper size nozzle for the solution to be sprayed, first multiply the desired GPM or
GPA of solution by the water rate conversion factor. Then use the new converted GPM or GPA
rate to select the proper size nozzle.
Example:
Desired application is 20 GPA of 28%N. Determine the correct nozzle size as follows:
GPA (solution) x Conversion factor = GPA (from table)
20 GPA (28%) x 1.13 = 22.6 GPA (water)
The applicator should choose a nozzle size that will supply 22.6 GPA of water at the desired pres-
sure.
Weight Of Solution
Specific Gravity
Conversion Factors
8.34 lbs per gallon - Water
1.0
1.0
10.65 lbs per gallon - 28% Nitrogen
1.28
1.13
11.0 lbs per gallon - 32% Nitrogen
1.32
1.15
Summary of Contents for 500 BW
Page 6: ......
Page 31: ...27 Spray Tip Wear...
Page 38: ...34 TeeJet Air Induction Spray Tips At Various Speeds And Pressures 20 Inch Tip Spacing...
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Page 96: ...2007 by Miller St Nazianz Inc...