Great-plains NP4000B Operator Manual User Manual download pdf (Page 104)

100 2013+ NP4000/A/B Table of Contents Index Great Plains Manufacturing, Inc.

417-199M Table of Contents Index 2014-05-14

Select and Install Oriﬁce Plates

If using VeriFlow nozzles, oriﬁce plate instructions do not

apply. However, the topic “Tramlines and Doubled

Rows” on page 101 applies to all types of nozzles.

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.

Refer to Figure 69

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 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:

15 psi 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.

For rate ranges in liters per hectare, see page 175.

Material Loss or Misapplication Risks:

Oriﬁce size must be appropriate for rate selected. Drop line

oriﬁce plates do not affect rate on ground drive pumps, and

are not used to control rate on hydraulic drive pumps. If the

oriﬁce size is too small, over-pressure in system may result in

material loss at the ground drive relief valve. A size too small

for a hydraulic drive system may require excess pressure to

achieve the target rate. An oriﬁce size too large may result in

uneven application across all rows.

If changing rate, changing material, changing ﬁeld speed or

shutting off rows, review oriﬁce sizing.

Figure 69

Fertilizer Drop Line Nozzle

29984

L38

Orifice Plate Size

20 28 34 48 59 80 98

Recommended Rate Range in Gallons per Acre. Range is 0 - PSI

Nozzle Spacing

(Values based on: 5.0 mph, 10.7 lbs/gallon Fertilizer solution density)

30 in. Triple Coulter 3.4 - 5.5 6.3 - 10 9.5 - 15 18 - 30 28 - 46 51 - 83 80 - 131

38 in. Triple Coulter 2.6 - 4.3 5.0 - 8.1 7.5 - 12 15 - 24 22 - 36 40 - 66 64 - 104

40 in. Triple Coulter 2.5 - 4.1 4.7 - 7.7 7.1 - 12 14 - 23 21 - 34 38 - 63 60 - 99

30 in. Double/TR Coulter 2.2 - 3.6 4.2 - 6.9 6.3 - 10 12 - 20 19 - 30 34 - 56 54 - 88

38 in. Double/TR Coulter 1.8 - 2.9 3.3 - 5.4 5.0 - 8.1 9.7 - 16 15 - 24 27 - 44 42 - 69

40 in. Double/TR Coulter 1.7 - 2.7 3.2 - 5.2 4.7 - 7.7 9.2 - 15 14 - 23 26 - 42 40 - 66

30 in. Single Coulter 1.1 - 1.8 2.1 - 3.4 3.2 - 5.2 6.1 - 10 9.3 - 15 17 - 28 27 - 44

38 in. Single Coulter 0.9 - 1.4 1.7 - 2.7 2.5 - 4.1 4.8 - 7.9 7.3 - 12 13 - 22 21 - 35

40 in. Single Coulter 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.

31014E

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