Great Plains NP3000A Operator Manual - Manual (Page 42)

38 NP3000 and NP3000A Table of Contents Index Great Plains Manufacturing, Inc.
407-613M Table of Contents Index 2014-04-22
NP3000A: Emergency Shut-Off Rope
This part of hitching requires operating the emergency
shut-off valve. If the applicator was correctly shut down
and discharged after last use, there is no anhydrous
ammonia liquid in the system, and only small amounts of
vapor, at low pressure. If the applicator was improperly
shut down, checking the emergency valve could be
hazardous.
Possible Chemical Hazard:
Wear your NH
3
PPE a . Be up-wind of any possible release
points. Residual NH
3
(possibly in dangerous quantities) may
be present in the applicator systems, from the inlet Acme
cap
to the On/Off solenoid valve (not shown). Unprotected
exposure could result in permanent lung/eye injury or death.
Refer to Figure 9
At each cooler inlet emergency shut-off valve
:
Check System Discharged
1.
Check that both halves of the breakaway coupler
are fully mated. If they are not,
STOP.
Treat this as a breakaway event (see page 65).
Refer to Figure 10
About Bleed Valves:
The purpose of a bleed valve is to perform a controlled
release, via an orifice
, of any fluid or gas trapped in
the closed line prior to operating other valves or
uncapping at a nearby Acme fitting.
If the line is discharged, opening the valve may have no
result, or may release a small amount of NH
3
vapor at
low pressure. If there is a low pressure release, leave the
valve open at the current position. Move away up-wind.
Return when the release concludes.
If the line was not discharged, opening a bleed valve may
release NH
3
vapor at high pressure, or may release NH
3
liquid, most likely as a spray.
If the there is liquid in the line segment, completion of a
bleed can take a long time. As the fluid turns to vapor, it
chills the remaining fluid, slowing evaporation.
If opening a bleed valve results in an unexpected large
discharge, immediately close the valve and follow the
instructions for discharging the system (page 108).
a. PPE: Personal Protective Equipment
Figure 9
Breakaway Check
31529
A13
A11
A14
A18
A11
A18
A14
Figure 10
Coupler Bleed Valve Detail
31569
A13
Suffocation, Blinding and Burning Hazards:
Be up-wind when operating a bleed valve.
Wear chemical gloves when operating a bleed valve.
Wear goggles when operating a bleed valve.
Do not place your body or head in front of the orifice.
Follow a check-list when operating a bleed valve.
Open a bleed valve slowly.
Leave it open until all fluid and vapor flow ceases.
This can take a long time.
1
1