Seed Hawk Raven 2012 - Manual (Page 256)

Appendix C
244 Seed Hawk® Viper Pro™ Installation & Operation Manual
From this information, calculate the volume per minute per nozzle as follows:
where NVPM = Nozzle Volume per Minute (in gallons/acre [L/ha]), Rate = Target Application Rate, Speed =
Target Speed of Application and NS = Nozzle Spacing.
For Example:
Application Pressure = 30 PSI, Target Application Rate = 20 GPA, Target Speed = 5.2 MPH and Nozzle
Spacing = 20 inches
Using the calculated Nozzle Volume per Minute of 0.35 at an Application Pressure of 30, select a tip that is
capable of these application specifications. Contact a local sprayer supply dealer for available nozzles or
spray tips.
Band Spraying Rate Adjustment
To calculate the adjusted applied rate for band spraying applications, use the following formula:
where BR = the Broadcast Rate, BW = the bandwidth, S = the spacing between the tips, and AR = the Adjusted
Rate for band spraying.
For Example:
If the Broadcast Rate is 20 GPA [187 L/ha], the band width is 14 inches [35 cm], and the tip spacing is 40
inches [101 cm]:
Therefore, the adjusted rate is 7 GPA [65 L/ha].
Verifying Flow Rate Limits
The target rate for an application must be within the range of that specified for the Raven flow meter installed.
Flow Meter Model Flow Range
Average Meter
Cal Value
RFM 5 0.05 - 5 GPM [0.2 - 18.9 lit/min] 5500
RFM 15 0.3 - 15 GPM [1.1 - 56.8 lit/min] 1750
RFM 60P 1 - 60 GPM [3.8 - 210 lit/min] 720
RFM 100 3 - 100 GPM [11.4 -380 lit/min] 700
RFM 200/ 200 Poly 15 - 200 GPM [56.8 - 760 lit/min] 164
RFM 400 25 - 400 GPM [94.6 - 1515 lit/min] 80
NVPM
Rate Speed × NS ×
5 940 60 000 , [ ] ,
----------------------------------------------- =
NVPM
20 5.2 Ч 20 Ч
5 940 ,
-------------------------------- 0.35 = =
BR BW ×
S
----------------------- AR =
AR
20 187 [ ] 14 35 [ ] Ч
40 101 [ ]
------------------------------------------- 7 65 [ ] = =