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Jinzhou Petrochemical completed 80,000 tons/year styrene plant before the repair date. The maintenance began on April 14 and used more than 200 routine and key maintenance items such as the replacement of fractionation towers, heat exchangers, high-energy-consumption pumps, and dry gas compressor heads, and transformation of lubricating oil station systems. Of these, 22 are technological transformation projects. The overhaul will completely eliminate hidden dangers of equipment and make the technical and economic indicators be comprehensively improved.