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Install orifice plates, Alternate orifice plates, Row shutoff – Great Plains NP4000 40-foot Operator Manual User Manual

Page 74

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NP4000

Table of Contents

Index

Great Plains Manufacturing, Inc.

407-776M

Table of Contents

Index

2012-03-28

Install Orifice Plates

Refer to Figure 49
Insert the plate inside the gasket

supplied with the

nozzle

. Insert the gasketed plate with the legend side

facing out the nozzle outlet (typically up).

In general, the orifice

needs to be small enough to

create enough pressure in the manifold to operate the
check valves

in the boom clamps, but not so much

that the system dumps product at the boom relief valve.

The recommend operating pressure is: 15 to 40 psi

Using an orifice size too large can result in unequal flow
at rows, intermittent flow, and flow stoppage at rows
where pressure falls below the 8 psi required to open the
clamp check valve. Using a size too small can cause
excess back-pressure resulting in material dumping at
the boom relief valve.

Use the same size at all active rows.

Excess Back-Pressure Risk:
If using a size of 0.048in or larger, remove the 828-046C
nozzle from the outlet of the coulter applicator tine.

Row Shutoff

Refer to Figure 49
Unused drop lines may be shut off by replacing the
nozzle

with a Great Plains 832-042C cap

.

Nutri-Pro

®

boom systems typically have more nozzles

than coulters, and include caps for unused rows.

When installing a cap:

• It is not necessary to remove the gasketed orifice plate

from inside the clamp. The cap includes its own gasket
that seals at the end of the clamp port.

• Use a tie wrap or other line to secure the loose nozzle

and drop line tubing to the boom.

• Adjust pump and/or orifice plates for new rate and row

spacing.

Mis-Application or Material Loss Risk:
Do not apply materials after row shut-off or row turn-on
without first reviewing setup. Merely changing the number of
active rows does not change the application rate. If pump
and/or orifice size changes are not also made, pressures could
be too low or too high.

Note: Replacement nozzles include gaskets.

Gaskets

may also be ordered separately as

Great Plains part number CP18999-EPR.

Agricultural Chemical Hazard:
Wear protective gloves when changing orifice plates and
strainer screens. Consult material manufacturer or supplier
documents for proper handling and steps to take if skin contact
occurs.

Alternate Orifice Plates

Figure 49

Fertilizer Orifice Plate

29984

37

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.

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