Orifice plate selection, Determine orifice size, Orifice plate selection - u.s. customary units – Great Plains YP2425F-2470 Material Rate User Manual
Page 40: Orifice plate selection - metric units
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YP2425 & YP2425F
Great Plains Manufacturing, Inc.
401-406B
2013-09-23
Orifice Plate Selection
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. 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.
Orifice Plate Selection - U.S. Customary Units
Orifice Plate Selection - Metric Units
Figure 13
Fertilizer Orifice Plate
29984
Orifice
Part
Port
Port
Size
Number
Diameter
Area
20
832-052C
0.020 in
0.20 mm²
28*
832-056C
0.028 in
0.40 mm²
34*
832-053C
0.034 in
0.59 mm²
48*
832-054C
0.048 in
1.17 mm²
59 832-057C
0.059
in
1.76 mm²
80
832-055C
0.080 in
3.24 mm²
98
832-059C
0.098 in
4.87 mm²
29993
* Sizes standard in many fertilizer bundles.
Check your accessories before ordering.
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)
15in single (30TR)
2.2 - 3.6
4.2 - 6.9
6.3 - 10
12 - 20
19 - 30
34 - 56
54 - 88
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
* These sizes standard in most Great Plains fertilizer systems.
31014A
Orifice Plate Size
20
28*
34*
48*
59
80
98
Recommended Rate Range in Litres per Hectare. Range is 15 - 40 PSI
Nozzle Spacing
(Values based on: 8.0 kph, 1.28 kg/litre Fertilizer solution density)
38.1 cm single (76.2 Twin)
21 - 34
39 - 64
59 - 96
115 - 188
174 - 284
318 - 520
502 - 820
50.8 cm single
16 - 26
30 - 48
44 - 72
86 - 141
130 - 213
239 - 390
376 - 615
70 cm single
11 - 19
21 - 35
32 - 52
62 - 102
95 - 155
173 - 283
273 - 446
76.2 cm single
10 - 17
20 - 32
29 - 48
57 - 94
87 - 142
159 - 260
251 - 410
* These sizes standard in most Great Plains fertilizer systems.
31014B