A professional who assists still-pump operator and pumper in pumping crude, semiprocessed, and finished petroleum products, water, and chemical solutions through processing, storage, and shipping departments of refinery. Respnsibilities include:

• Turns valves and switches to start and regulate operation of pumping units.
• Turns handwheels to open and close pipeline and tankage valves to direct flow of product to destination.
• Inspects pumps, lines, and tankage valves for leaks and malfunctioning.
• Lubricates valves and pumps.
• Tightens connections, using wrenches.
• Gauges contents of tanks, using tape gauge or automatic remote-controlled gauging equipment.
• Takes temperature readings by lowering thermometer into tank.
• Draws samples of product by lowering sample container into tank or by opening bleeder valves on pipelines to draw sample.
• Loads barges and tank cars.
• May make specific gravity and color tests.
• May clean equipment.
• May use radio or telephone to communicate with pumper.
• May blend and dye gasolines, using standardized formulas, and prepare blending report.
• Performs other duties as described under helper master title.