Great Plains YP1625 Operator Manual - Manual (Page 68)

64 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Orifice Plate Selection
Refer to Figure 86
DANGER
!
Wear protective gloves when changing orifice plates.
Refer to Figure 86
In general, the orifice
needs to be small enough to
create at least 15 psi of pressure in the manifold but
large enough to prevent the manifold pressure from
exceeding 85 psi.
The minimum pressure is required to even out the flow of
fertilizer between rows. To reduce orifice plugging and
pump wear, use the largest orifice practical for your fertil-
izer application rate.
The best pressure range to maintain is 15-40 psi to
ensure optimum distribution while minimizing leakage.
IMPORTANT !
Orifice size is only used to create 15-65 psi back pres-
sure to provide even flow between rows. Set application
rate in gallons per acre using pump drive chart.
Orifice Size Charts
Figure 86
Fertilizer Orifice Plate
21983
6
6
Orifice Size Great Plains Part Number
20 832-052C
28
a
a. These sizes are supplied with YP1225 and YP1625 man-
ifolds.
832-056C
34* 832-053C
48* 832-054C
59 832-057C
80 832-055C
Suggested Orifice Size
for Given Rate
15in / Twin Row 20in Rows 30in Rows 36in Twin Row
Gallons per Acre at 5 MPH
2.0 20 20 28 20
3.0 20 28 34 28
4.0 28 28 34 28
5.0 28 28 48 34
6.0 34 34 48 34
7.0 34 34 48 34
8.0 34 48 59 34
9.0 34 48 59 48
10.0 48 48 59 48
11.0 48 48 59 48
12.0 48 48 59 48