Great Plains NTA3007HD Operator Manual - Manual (Page 115)

Maintenance and Lubrication 111
04/04/2011 166-207M
Depending on their use, the NTA907HD and
NTA3007HD material hoppers may be or become “per-
mit-required confined spaces” under U.S. OSHA regula-
tions (29 CFR 1910.146) and similar regulations,
statutes, insurance agreements and local business pol-
icy. A written policy and permitting process may be
required for any hopper entry.
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 harness/line, respiratory sup-
port and protection. This may include contaminant
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
Block the drill wheels to prevent 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
65. 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.