A professional who performs any combination of following tasks in refinery. Respnsibilities include:

• Digs ditches, builds dikes and levees, and fills holes with earth, rock, sand, and asphalt gravels, using pick and shovel.
• Smooths ground surfaces and roadways, using hand tamper.
• Cleans refining equipment.
• Removes debris from roadways and work areas, and sprays and hoes weeds.
• Shovels sand and gravel off vehicles and dumps or shovels cement and sand into mixers.
• Mixes and pours cement and transports cement to forms with wheelbarrow.
• Unloads materials, such as tools, equipment, sacks of cement, sand, catalyst, salt, and lime, and oil barrels from freight cars and trucks, manually or with handtruck; and stacks barrels and sacks for storage.
• Uncrates equipment and parts, such as fractionating or treating towers and bubble trays, using pry bar and hammer; and installs bubble caps, using wrenches.
• Rips open sacks and dumps chemicals and catalysts into mixing, treating, or storage tanks.
• Dopes pipelines to prevent corrosion, using doping pot and tar.
• Changes hoist cables, and rigs chain hoists, rope blocks, power winches, and gin poles used to move or raise equipment.
• Skims oil from cooling water in water boxes.
• May be designated according to section of refinery in which work is performed as Laborer, Filter Plant.