Great Plains NP3000A Operator Manual - Manual (Page 113)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 109
2014-04-22 Table of Contents Index 407-613M
System Blow-Out
4.
To rapidly reduce the vapor in the system to trace
amounts, use compressed air at the Acme inlet
.
Loop Clearing
5.
Loop fluid: If it has been more than a day, with the
temperature above freezing, since application
completed, and there is still fluid in the loops, it is
probably ammonium hydroxide (NH
4
OH). If
necessary to clear it from the lines, follow these
steps:
a. You will need to have the console connected to
the meter harness and powered up. Have the
console up-wind of the applicator.
b. If liquid NH
3
is suspected to be present, lower
the tines into the ground.
c. Connect the air hose to the Acme inlet . Use
hose extensions as needed to perform this
blow-out outdoors. You also need a connection
at the Acme inlet that does not rely on a person
standing there to maintain it.
d. Open all line valves.
Open the emergency shut-off valve
.
On the console, turn the POWER switch on,
MASTER switch on, and
BOOM 1 switch on, and
any section valves ON.
Command a high rate.
e. Set the air source regulator to no more than
150 psi.
f. Flow air through the system until odor falls to
acceptable levels.
a. You will need a funnel with tip O.D. smaller than
the delivery tube I.D. (
3 ⁄
8
inch, 9.5 mm), and a
fresh water source.
b. Face the applicator into the wind.
c. Disconnect a delivery line at a flow divider
outlet .
d. Connect the funnel to the line.
e. Add water until it appears at the tines. Then add
one more gallon (4 liters). This results in a an
NH
4
OH solution that is more dilute than
household cleaning ammonia.
f. Blow out the line if air is available.
Do not exceed 150 psi.
g. Reconnect the line at the flow divider.
h. Repeat step 5a through step 5f for all tubes.
If there is ammonium hydroxide (NH
4
OH) fluid (or
merely condensed water) in the delivery loops, this
blow-out procedure may remove some, but not all, of
that fluid.
A12
A12
A18
Violent Reaction Hazard:
If the delivery loop fluid was freshly formed, or is cold, assume
it is pure liquid NH
3
, and do not perform a loop clearing for
several hours, and then only after performing discharge step 1
through step 4f.
Adding water to pure NH
3
causes a violent solution reaction.
It could cause large irregular discharges of liquid and vapor
back up the delivery tube and at the tines. This liquid is likely
to be highly caustic, and emitting dangerous concentrations of
anhydrous ammonia vapor.
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