- Mechanical Engineering Technicians
- Boilermakers
- Hazardous Materials Removal Workers Green
- Explosives Workers, Ordnance Handling Experts, and Blasters
- Chemical Plant and System Operators
- Petroleum Pump System Operators, Refinery Operators, and Gaugers
- Chemical Equipment Operators and Tenders
- Separating, Filtering, Clarifying, Precipitating, and Still Machine Setters, Operators, and Tenders
- Gas Compressor and Gas Pumping Station Operators
- Pump Operators, Except Wellhead Pumpers