Lesson 3/Learning Event 3
LEARNING EVENT 3:
DESCRIBE OPERATOR
CORRECTIVE MAINTENANCE ON THE
TANK-UNIT ASSEMBLY, M2 WATER HEATER,
AND PERSONNEL SHOWER UNIT ASSEMBLY
A detailed description of the procedures used by the operator to maintain
the tank-unit assembly, M2 Water Heater, and the personnel shower unit
assembly are provided in this learning event. This will enable the operator
to perform corrective maintenance with a better understanding of what must
be done.
Maintenance of the Tank-unit Assembly.
Maintenance
of
the
tank-unit
assembly is performed by using the following steps.
WARNING
Before entering the tank-unit assembly, flush the interior of the
tank with water to dissolve residual STB decontaminating agent.
Drain the tank. Ventilate the interior of the tank with a stream
of forced air to drive out the vapors. If entering the tank-unit
assembly, insure that someone is stationed outside who will
prevent the equipment from being moved, forklifted, hoisted, or
used, and will come to your aid if necessary.
NOTE
Take a trouble light into the tank-unit assembly as an indication
that someone is inside.
Step 1.
Clean accumulations of hardened slurry from inside the tank-unit
hopper blender, and the screen (figure 12 on page 44).
Clean the tank
liquid-level indicator so that its markings are legible. Immediately after
slurry operation, clean the agitator with hot water, using a stiff brush to
remove deposits of hardened slurry. Wash the interior of the tank and the
inside and outside of the hoses with hot, soapy water rinse with hot water.
Flush the foot-valve assembly with hot water wipe dry. Clean the outside of
the tank-drain valve, tank-unit assembly, foot-valve assembly, and quick-
disconnect coupling halves with dry-cleaning solvent (SD).
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