WORK PROCESS
PLANT OPERATOR
O*NET/SOC CODE: 51-9021.00 RAPIDS CODE: 0961
DESCRIPTION: Operates concrete, asphalt, or sand and gravel plant to batch, crush, or segregate materials used in construction: Moves controls on panel board or control board to heat, dry, and mix ingredients, such as asphalt, sand, stone, and naphtha, to produce asphalt paving materials; to weigh and mix aggregate, cement, and water to produce concrete; or to control feeding, crushing, and sifting machinery in sand and gravel plant. Observes gauges, dials, and operation of machinery to ensure conformance to processing specifications. May repair machinery, using handtools, power tools, and welding equipment. May be designated according to type of plant operated or according to machine function.
ON-THE-JOB TRAINING:
APPROXIMATE HOURS
1. Asphalt Plant Mixer
700
a. Learn to handle the levers and controls that automatically
weigh dry sand stone and asphalt then dumping them into
a mixing drum
2. Batch Plant, Portable and Semi-Portable
300
a. Learn to weigh aggregate for concrete
b. Adjust scales for required weight of material
c. Make proper mixes
3. Central Mix and Batch Plant
800
a. Learn to operate a large mixing plant centrally located
on project or job
b. Adjust scales or proportions for each material needed
to be mixed in large drums for a proper period of time
to make good concrete material
4. Crushing plant
1000
a. Learn to make proper adjustments to crush the
size of material desired
b. Make repairs on machines
c. Service conveyors feeding crusher
d. Learn to adjust conveyor belts
5. Screening Plant
250
a. Learn to operate the controls
b. Learn to operate engine and electric motors
c. Learn to operate shaker screens to separate
the different sized materials
d. Learn to change screens to get desired size of material
6. Material Loader, Conveyor and Front End
500
a. Learn to operate, service and adjust various types
of loaders and conveyors
b. Learn to repair the machinery so as to work with
repairer in making repairs
7. Mortar Mixing Plant
250
a. Learn to make the proper mix of fine material with
lime and sand to the right proportions for plaster
and mortar for bricklaying
8. Asphalt Plant Firer and Watch Firer
700
a. Learn to keep proper fire in head or under dryer drum
to heat and dry aggregate for proper mix by the means
of valves or control levers
9. Retort Firer
200
a. Learn to manipulate controls to equalize pressures
inside and outside of retorts to maintain specified
furnace temperatures
10. Maintenance-Cutting and Burning-Grease and Oils
600
a. Learn to make necessary repairs to the equipment
under supervision of the heavy duty repairer and welder
b. Learn the types of oils and greases and their uses
11. Heavy Duty Mechanic Erecting and Dismantling
300
a. Learn to build-up and repair worn parts
12. Heavy Duty Cutting and Burning
200
13. Materials
200
a. Learn use of instruments and plans for processing
the various materials
TOTAL HOURS
6000
