Is Yueyang Xingchang Petrochemical a departmental unit?

No. Department-level units refer to prefecture-level administrative units under the jurisdiction of provincial and ministerial government agencies and institutions. The main person in charge of the unit enjoys the treatment of department-level leading cadres, while Yueyang Xingchang Petrochemical is a local refining enterprise under Yueyang Municipal Government, and the person in charge of the company does not enjoy the treatment of department-level leading cadres, so Yueyang Xingchang Petrochemical is not a department-level unit.