Suspending application – Great Plains NH3 Safety User Manual
Page 34
30
NH
3
Safety
Great Plains Manufacturing, Inc.
407-551M
2013-07-15
Suspending Application
These instructions are for brief stops in the field, for
example, to make a phone call. See also “Stopping
Application” on page 29.
a.
What is the wind direction?
b.
Turn MASTER switch OFF.
This turns On/Off Valve off.
With On/Off Valve off, there is still a substantial amount
of liquid NH
3
downstream of all valves, in the flow divider,
row application tubing, and row applicators. When
stopped, in ground, this slowly warms, vaporizes, and is
expelled into the soil. See warning at right.
c.
Continue field application until the Flow Divider
pressure gauge reads zero. Wait at least another
5 minutes.
d.
Turn up-wind.
e.
Leave the implement in the ground. There is still
considerable NH
3
vapor in the lines that are open to
the soil. There may also be a modest amount of
liquid in cold tubing loops.
Choking Hazard:
Never raise a recently operated implement when you are
down-wind of the implement. Be or turn up-wind if it is
necessary to raise a working implement. Wear your goggles. A
substantial amount of anhydrous ammonia is rapidly released
if you do not allow time for it to bleed off underground. The
concentration could be high enough to cause irritation,
breathing difficulty or asphyxiation.