Great Plains NH3 Safety - Manual (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Index Ammonia Nurse Tanks 21
2013-07-15 Table of Contents Index 407-551M
Refer to Figure 19 and Figure 20
A79 Drain Valve:
Inspect this valve (which may be merely a plug
fitting). Check for general mechanical condition, and
signs of criminal tampering.
Do not open this valve. It is used only to fully drain
the tank for major maintenance.
A80 Relief Valve:
Locate this valve. It is on the tank top, usually under
a protective structure away from the operating
valves. It may be near the wash water tank.
Refilling the wash water tank often places you close
to the relief valve. Be up-wind. Check the pressure
gauge before refilling the wash tank.
At high tank pressures the relief valve is designed to
release NH
3
until the pressure drops below 250 psi.
At 120
°F (40°C), the vapor pressure reaches
250 psi. Above this point, the relief valve
periodically operates, and small NH
3
gas releases
occur.
Refer to Figure 20
A81 First Aid Water:
Check that this tank is present.
Check that it was freshly filled.
Check that hose ends are secure.
Ensure that all operators know how the tank works.
Where is it? How many hoses does it have? Do not
wait until an accident to learn which end of the
hose
is which.
Transport and materials safety regulations require
this tank, and the decal
that identifies it. The
tank may be installed on the top or side of the nurse
tank.
The Nutri-Pro
®
implement also has a wash water
tank. See “Ammonia Emergency Action” on
page 7 for further information about First Aid Water
tanks.
A82 CAUTION AMMONIA Decal:
Required by transport and hazardous materials
regulations, on both sides of the tank. This decal is
for all users and the general public.
Ammonia Release Hazard:
On a hot day, remain up-wind of the relief valve at all times.
On a hill, or if the tank is over-filled, or if the tank tips in an
accident, this valve can release liquid NH
3
.
Figure 19
Drain and Relief Valves
31574
A79
A80
Figure 20
First Aid Wash Water Tank
31560
A81a
A81b
A81
A80
A82
A81a
A81b