Orifice plate selection, Determine orifice size – Great Plains YP4025F-1670 Material Rate User Manual
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YP30/4010HDP/20P/25
Great Plains Manufacturing, Inc.
401-571B
2014-03-13
Orifice Plate Selection
Refer to Figure 12
Orifice plates
at each drop line nozzle provide
back-pressure that balances flow in the manifolds,
assuring that each row obtains the same flow rate. For a
given rate, there may be more than one orifice size that
provides the recommended back-pressure.
Plates are provided with the system(s) in three sizes.
Additional sizes are available.
In general, the orifice
needs to be small enough to
create a minimum pressure in the manifold but large
enough to prevent the manifold pressure from exceeding
the maximum:
15psi min., 15-40 optimal, 65 psi max.
Using an orifice size too large can result in unequal flow
at rows. Using a size too small can cause excess
back-pressure resulting in material dumping at the relief
valve.
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.
Agricultural Chemical Hazard:
Wear protective gloves when changing orifice plates. Consult
material manufacturer or supplier documents for proper
handling and steps to take if skin contact occurs.
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.
Figure 12
Fertilizer Orifice Plate
29984
1
1
1
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
14.8in (38cm, 75TR)
2.3 - 3.7
4.3 - 7.0
6.4 - 10
12 - 20
19 - 31
35 - 56
55 - 89
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
29.5in (75cm single)
1.1 - 1.9
2.1 - 3.5
3.2 - 5.2
6.2 - 10
9 - 15
17 - 28
27 - 45
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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