Operate or watch over equipment to control chemical changes or reactions in the processing of industrial or consumer products. Their equipment used includes devulcanizers, steam jacketed kettles, and reactor vessels.

Monitor and control activities associated with hydropower generation. They operate plant equipment, such as turbines, pumps, valves, gates, fans, electric control boards, and battery banks. They monitor equipment operation and performance and make necessary adjustments to ensure optimal performance. They perform equipment maintenance and repair as necessary.

Control and monitor biomass plant activities and perform maintenance as needed.

Monitor, operate, and maintain landfill gas collection system components and environmental monitoring and control systems.

Calculate, measure, load, mix, and process refined feedstock with additives in fermentation or reaction process vessels and monitor production process. They perform, and keep records of, plant maintenance, repairs, and safety inspections.

Operate or control petroleum refining or processing units. They specialize in controlling manifold and pumping systems, gauging or testing oil in storage tanks, or regulating the flow of oil into pipelines.

Distribute or process gas for utility companies and others by controlling compressors to maintain specified pressures on main pipelines.

Control or operate entire chemical processes or system of machines.

Operate or control an entire process or system of machines, often through the use of control boards, to transfer or treat water or wastewater.

Operate or maintain stationary engines, boilers, or other mechanical equipment to provide utilities for buildings or industrial processes. They operate equipment, such as steam engines, generators, motors, turbines, and steam boilers.