The tank farm for the 600 kt/a ethylene plant of PetroChina Tarim Petrochemical Company is equipped with eight ethylene spherical tanks with a volume of 3,053 m3. In 2023, the first periodic inspection was carried out for the ethylene spherical tanks after they were put into operation. While strictly implementing the Pressure Vessels Periodical Inspection Regulation, the main damage mechanism and failure mode of the spherical tanks were fully considered. The inspections mainly include document review, macroscopic examination, wall thickness measurement, surface defect detection, ultrasonic testing, hardness testing, and safety accessory inspection. During the process disposal, scaffolding erection, weld grinding and other tasks prior to the inspection, safety technical disclosure was strictly conducted with the construction company, and construction and management were carried out according to the standardized templates, so as to ensure the safe and efficient completion of the inspection.