Great Plains NP4000 40-foot Operator Manual - Manual (Page 74)

70 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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