Great Plains NTA2007HD Operator Manual - Manual (Page 115)

Great Plains Manufacturing, Inc. Contents Index Maintenance and Lubrication 111
04/04/2011 Contents Index 166-283M
Hopper entry may be necessary in some unusual cir-
cumstances, such as:
• hopper level or pressure sensor replacement; or,
• removal of obstructions too difficult to pull out with the
meter box removed and not susceptible to fishing or
pumping out from the open lid.
Should such a situation arise, observe the following pre-
cautions:
1. Evaluate the hazards
Review the material safety data sheets (MSDS) for
any treatments and/or fertilizers used in the hopper
since it was last thoroughly cleaned, and the most
recent materials even if the hopper was subse-
quently cleaned. Retain the MSDS information for
any medical treatment that might be required.
2. Designate or engage a team
Hopper entry is never a single-person activity. At
least one attendant/observer is necessary. Give pri-
ority to individuals already trained in confined space
operations. Designate a leader (who will not be the
entrant) with authority to terminate the activity.
3. Protect the team
Obtain the necessary safety equipment specified for
confined space exposure to those materials, paying
particular attention to safety harness/line, and respi-
ratory support and protection. This may include con-
taminant detection equipment and positive
ventilation to refresh air in the hopper.
4. Equip the team
At least one attendant must be equipped with com-
munications capability, to summon outside aid in the
event that the hopper worker is overcome. Equip the
entrant with a safety harness and safety line.
5. Train the team
Review the hazards. Review the procedures. Under-
stand the use of the protective equipment. Know the
steps to take in emergencies. Practice them. Train
the observer to summon aid, and not attempt hopper
entry if the entrant is overcome.
6. Secure the drill
Set optional brakes or block the drill wheels to pre-
vent movement.
7. Disrupt crusting or bridging
From outside the hopper, break up any hard surfac-
ing on top of the material, or forming layers within the
material. Such layers are extremely dangerous to
stand on.
8. Empty the hopper
Follow the steps at “Unloading Materials” on
page 108. If a blockage makes this impossible, use
an external pump line to remove as much material as
possible without performing a hopper entry. Pump
until at least some material is exiting the clean-out
door. Leave the clean-out door open.
9. Clean the hopper
From the outside at the walkboard, power-wash the
inside of the hopper. Use a mild detergent sprayer.
Rinse thoroughly.
10. Air the hopper
Leave the hopper lid and clean-out door open, and
do not commence work until the rinse water has
completely evaporated.
11. Plan the work. Work the plan.
Postpone the work if any team members, equipment
or other resources are missing, or weather/lighting
conditions are not favorable. Terminate and evacuate
if any unexpected situations arise.