V.
CALIBRATION
A. INTRODUCTION
65
CALIBRATION
Example of de-icing solution Rate Cal
For the purpose of de-icing solutions, we have chosen to look at the fertilizer nozzles. *This is an example
that is based on feedback from our customers, it should not be construed as a recommendation of what type
of nozzle you should be using for your spray job.*
1. First you must know the weight of the solution you intend to spray. The tabulations on the spray tip guide
are based on the weight of water. Therefore you must convert the weight of the solution to that of water to ap-
propriately find the best nozzle.
Ex
: You intend to apply 1 gallon per 1000sq.ft., your solution weight is 9 pounds per gallon. The conversion
factor is 1.04:
1g/1000 sq.ft. x 1.04=1.04g/1000 sq.ft.
2. Now figure your gallons per minute using the following formula:
GPM= G/1000sq.ft. x speed x spacing
136 (constant)
Ex:
You have a 15” nozzle spacing on your booms. You wish to travel at 20 MPH.
GPM= 1.04 x 20 x 15
312 =
2.29GPM
136
136
3. The fertilizer nozzles are not configured in the 1000 sq.ft of the turf application and must be converted
from GPA. So knowing that the adjusted application rate is 1.04g/1000 sq.ft. and that 1g/1000 sq.ft. is
43.56GPA you multiply:
1.04g/1000 sq.ft. x 43.56GPA= 45.3024GPA
4. The tabulations in the spray nozzle guide are figured considering a 20” nozzle spacing, yours is 15”. You
must multiply the GPA of both the tabulation in the guide book and the above calculation by 1.32:
45.3024GPA x 1.32= 59.80 GPA
Continued on the next page