Shandong’s technical supervision bureau got specialists to do an on-spot review of Changyi Petrochemical’s propylene production line, recently, and they concluded that its propylene production permit deserved to be renewed, based on a review of the production regulations on dangerous chemicals, such as compressed, liquefied gases, and the reports they got. They also checked the equipment in use, work safety, and laboratory, and examined documents, concluding that the company has a sound management system in human resources, quality, equipment, and safety and its equipment is safe and effective.