Great Plains NP30A 30-foot Operator Manual - Manual (Page 76)

72 NP30A or NP40A Table of Contents Index Great Plains Manufacturing, Inc.
407-502M Table of Contents Index 2014-05-20
Pass Planning
If field requirements permit, you can minimize exposure
to NH
3
vapor with the following recommendations:
Refer to Figure 60
• Check the wind direction.
• Plan passes to be cross-wind and turns up-wind.
• Plan first pass on down-wind side of field.
• Choose your first pass to allow you to be up-wind
while operating valves at the nurse tank and
applicator. Opening the emergency shut-off valve
typically requires climbing on the applicator from the
right. Starting with the wind from the right is optimal.
Anhydrous Ammonia Exposure Hazard:
If field requirements result in any down-wind operations:
▲ Use only a tractor with an enclosed cab.
▲ Have an escape route (up-wind turn) available for all
down-wind operations.
▲ Conduct end-of-pass operations to minimize above-ground
releases.
▲ Be mindful of the risks of olfactory fatigue. You can
“get used to” the odor and fail to notice when
concentrations get dangerously high.
Start of Pass Planning
Ideally, you want NH
3
to begin flowing out of the knives
or tines right at the start of a pass, with the knives or
tines already in the ground. This minimizes atmospheric
releases.
Depending on wind direction, tractor capability, available
headlands, and field conditions, there are several ways
to start each pass.
A. Capable Tractor:
Lower applicator into ground at start of pass. Pull
forward to set them to operating depth. Start meter
flow. Do not start moving until flow divider pressure
gauge nears typical operating value.
B. Headlands Available, Any Tractor:
Lower applicator to ground some distance ahead of
the application area. Move forward slowly. As knives
or tines enter ground, start meter flow.
C. No Headlands, Marginal Tractor:
Lower applicator to ground at start of pass. Start
forward movement, then meter flow. Move slowly
until console rate display nears target rate.
Figure 60
Ideal Pass Planning
-
WIND
A1
Note: The procedures at left are not operating
instructions or checklists. They are outlines for
planning pass starts. See the step details starting
on page 74 and the checklists on page 81.