Chemical plants require a variety of workers including systems operators, safety inspectors, operations managers, engineers, and quality assurance workers. These jobs involve working with a variety of materials and specialized equipment, so duties and qualifications vary by position. A chemical plant is a large industrial manufacturing facility that processes or produces chemical compounds or materials on a large scale. Petrochemical plants are specialized to use chemicals derived from petroleum refinement. Some plants operate in continuous operation while others work in batch operation.