A professional who maintains, installs, and repairs process equipment in chemical plants, usually working under direction of repairer i. Responsibilities include:

• Inspects equipment for leaks and defective valves.
• Tightens flange connections and valves, using wrenches.
• Replaces driving belts, spray nozzles, gaskets, and packing in equipment and gaskets or seals in pipelines.
• Lubricates pumps and valves, using grease gun.
• Grinds and reseals valves, using power grinder.
• Dismantles and assembles equipment, using wrenches and portable power tools, as directed by repairer i to assist in repairs and installations.
• Cleans dirt and rust from equipment and parts prior to and after repairs are made, using brushes, buffer, and cleaning solutions.
• May test equipment for leaks, using compressed-nitrogen hose and compressor and vacuum gauge, to detect pressure drops.
• May assist equipment or process operator in operation or tending of equipment units during emergencies or rest periods.