Determine orifice size – Great Plains YP2425A Material Rate User Manual
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YP2425A
Table of Contents Metric Charts
Great Plains Manufacturing, Inc.
401-626B
Table of Contents Metric Charts
2012-02-29
Determine Orifice Size
The chart below shows rate ranges for each Great Plains
orifice size and row spacing. You may need to change to
the next higher or lower orifice for a different fertilizer
solution density and/or a different ground speed.
To reduce orifice plugging and pump wear, use the
largest orifice practical for your fertilizer application rate.
Material Loss/Equipment Damage Risk:
Set application rate at pump using pump drive chart., not by
orifice size. Orifice size is only used to create 15-65 PSI back
pressure to provide even flow between rows. An orifice size too
small causes material loss at relief valve. A size too large can
cause application imbalance across the planter.
Orifice Plate Size
20
28*
34*
48*
59
80
98
Recommended Rate Range in Gallons per Acre. Range is 15 - 40 PSI
Nozzle Spacing
(Values based on: 5.0 mph, 10.7 lbs/gallon Fertilizer solution density)
6 inch single
5.6 - 9.1
11 - 17
16 - 26
31 - 50
46 - 76
85 - 139
134 - 219
7.5 inch single
4.5 - 7.3
8.4 - 14
13 - 21
25 - 40
37 - 61
68 - 111
107 - 175
8 inch single
4.2 - 6.8
7.9 - 13
12 - 19
23 - 38
35 - 57
64 - 104
101 - 164
9.5 inch single
3.5 - 5.8
6.6 - 11
10 - 16
19 - 32
29 - 48
54 - 88
85 - 138
10 inch single
3.4 - 5.5
6.3 - 10
9.5 - 15
18 - 30
28 - 46
51 - 83
80 - 131
13.8in (35cm, 70TR)
2.4 - 4.0
4.6 - 7.5
6.9 - 11
13 - 22
20 - 33
37 - 61
58 - 95
15in single (30TR)
2.2 - 3.6
4.2 - 6.9
6.3 - 10
12 - 20
19 - 30
34 - 56
54 - 88
18in (36in Twin Row)
1.9 - 3.0
3.5 - 5.7
5.3 - 8.6
10 - 17
15 - 25
28 - 46
45 - 73
19in (38in Twin Row)
1.8 - 2.9
3.3 - 5.4
5.0 - 8.1
9.7 - 16
15 - 24
27 - 44
42 - 69
20 inch single
1.7 - 2.7
3.2 - 5.2
4.7 - 7.7
9.2 - 15
14 - 23
26 - 42
40 - 66
27.6in (70cm single)
1.2 - 2.0
2.3 - 3.7
3.4 - 5.6
6.7 - 11
10 - 17
19 - 30
29 - 48
30 inch single
1.1 - 1.8
2.1 - 3.4
3.2 - 5.2
6.1 - 10
9.3 - 15
17 - 28
27 - 44
36 inch single
0.9 - 1.5
1.8 - 2.9
2.6 - 4.3
5.1 - 8.4
7.7 - 13
14 - 23
22 - 37
38 inch single
0.9 - 1.4
1.7 - 2.7
2.5 - 4.1
4.8 - 7.9
7.3 - 12
13 - 22
21 - 35
40 inch single
0.8 - 1.4
1.6 - 2.6
2.4 - 3.9
4.6 - 7.5
7.0 - 11
13 - 21
20 - 33
* These sizes standard in most Great Plains fertilizer systems.
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