Nh3: check hydrostatic relief valves, Nh3: close bleed valves, Nh3: check hose discharged – Great Plains NP3000A Operator Manual User Manual
Page 60: Check hydrostatic relief valves, Close bleed valves, Check hose discharged
56
NP3000 and NP3000A
Great Plains Manufacturing, Inc.
407-613M
2014-04-22
NH
3
: Check Hydrostatic Relief Valves
3.
Check that the plastic cap is in place at each valve.
In the Great Plains configuration, this would be:
Ammonia Exposure and Loss Hazards:
Understand the reason for any lifted or missing hydrostatic
relief valve caps. If a cap is out of place, that line section may
have been closed with liquid NH
3
present, which later vented,
dislodging the cap. It is also possible that the valve disc has
deteriorated and is venting at normal operating pressures.
NH
3
: Close Bleed Valves
4.
Put on goggles and gloves. Approach the applicator
from up-wind.
5.
Check that all bleed valves are closed:
NH
3
: Check Hose Discharged
6.
Visually check the general condition of the
breakaway connection
. If the two halves appear
mated, use the inlet side bleed valve
for the next
step. Otherwise treat this as a breakaway event
(page 65).
7.
Orient the bleed valve orifice so that it points away
from you and down-wind.
8.
Wearing rubber chemical gloves, slowly open the
bleed valve
by rotating the T-handle
counter-clockwise.
Check for signs that there may be residual NH
3
in
between the Acme cap and the shut-off valve:
• strong ammonia odor
• hissing of escaping gas
• valve getting cold
• dripping or spraying fluid
9.
If there are any signs of residual NH
3
, leave the
bleed valve open until the ammonia has vented, and
the inlet fittings have re-warmed to ambient
temperature. This could take tens of minutes if the
applicator was recently and improperly shut down.
10. Close the bleed valve.
•
at each cooler
•
at the outlet side of the breakaway coupler
•
at the pressure/temperature gauges.
•
at the outlet side of the breakaway coupler.
•
at the inlet side of the breakaway coupler.
Figure 28
Hydrostatic Relief Valve
31564
A15
A23
A15
Figure 29
Applicator NH
3
Supply Hose
31529
Possible Chemical Hazard:
Wear your NH
3
PPE
a
. On a connection, residual NH
3
(possibly
in dangerous quantities) may be present in the applicator
systems, from the inlet Acme cap to the tines. NH
3
could also
be present in dangerous quantities between the Acme cap and
the cart shutoff valve. Unprotected exposure could result in
permanent lung/eye injury or death.
a. PPE: Personal Protective Equipment
A18
A14
A13
A29
A16
A13
A14
A13
A13