Maintenance Schedule 2021–2026 (Unit: Days)
| Enterprise Name | Maintenance Period | Duration (Days) | Remarks |
|---|---|---|---|
| Maoming Petrochemical | Mar. 25 – May 5, 2021 | 40 | |
| Fushun Petrochemical | Apr. 5 – May 19, 2021 | 44 | Originally planned for Apr. 10; brought forward to Apr. 5. |
| Jilin Petrochemical | Jun. 4 – Jul. 22, 2021 | 48 | |
| Shanghai Petrochemical | Apr. 15 – Jun. 20, 2021 | 65 | Maintenance of the 400 kt/a large-scale ethylene unit. |
| Panjin Ethylene | Jul. 15 – Sep. 2, 2021 | 48 | |
| Qilu Petrochemical | Aug. 4 – Sep. 23, 2021 | 50 | |
| Yangzi Petrochemical | Started May 23, 2021 | 14 | Originally planned for March; postponed to H2. Maintenance involved one of the two legacy 400 kt/a ethylene units; only one ethylene train was shut down. |
| Yanshan Petrochemical | Mar. 25 – May 19, 2021 | 54 | |
| Zhenhai Refining & Chemical | May 18 – Jun. 2, 2021 | 15 | Originally planned for Apr. 6; postponed to mid-May. |
| CNOOC Shell Phase I | Dec. 2021 | 30 | |
| Xinjiang Tianli | Started Oct. 27, 2021 | 30 | Since the large-scale ethylene unit had already been shut down early for maintenance, Tianli Co. also halted operations for maintenance. |
| Sinochem Quanzhou | Dec. 1, 2021 – Jan. 20, 2022 | 50 | |
| Yangzi Petrochemical | Mar. 15 – May 25, 2022 | 70 | Unit No. 2 (400 kt/a ethylene) started maintenance on Mar. 15 and restarted on May 25. Unit No. 1 (400 kt/a ethylene) shut down on Mar. 28 with planned maintenance until May 31. |
| Maoming Petrochemical | Apr. 30 – May 7, 2022 | - | Restarted on Aug. 7. |
| Shanghai Petrochemical | Jun. 18 – Aug. 20, 2022 | - | Unit No. 2 (300 kt/a ethylene) restarted on Aug. 20; Unit No. 1 (400 kt/a ethylene) restarted after stabilization. |
| Dushanzi Petrochemical | Started Jul. 2, 2022 | 10 | The large-scale ethylene unit shut down on Jul. 2 due to a cold box leak; emergency repairs lasted approximately 10 days. |
| Qilu Petrochemical | Jul. 20 – Aug. 2, 2022 | 13 | Maintenance began on Jul. 20; complete shutdown occurred on Jul. 23. Feedstock introduction resumed on Aug. 2; ethylene pyrolysis oil production started on Aug. 3–4. |
| Hengli Petrochemical | Aug. 1 – Aug. 21, 2022 | 20 | |
| Hengli Petrochemical | Sep. 13 – Sep. 22, 2022 | 10 | The 1.5 Mt/a ethylene cracking unit shut down on Sep. 13; estimated maintenance duration of 7–10 days. |
| Gulei Petrochemical | Sep. 14 – Oct. 10, 2022 | 25 | The 1.0 Mt/a ethylene unit underwent short-term shutdown and maintenance starting Sep. 14. |
| Zhejiang Petrochemical Phase II Train 2 | Feb. 15 – Mar. 10, 2023 | 23 | - |
| Zhenhai Refining & Chemical | Feb. 26 – May 15, 2023 | 84 | Restarted on May 15. |
| Liaoyang Petrochemical | Apr. 7 – End of May 2023 (est.) | - | - |
| Zhejiang Petrochemical | May 10 – Jun. 30, 2023 | 50 | - |
| Shanghai Secco | May 20 – Jul. 21, 2023 | - | Maintenance ended on Jul. 21. |
| Lanzhou Petrochemical | Started Jun. 6, 2023 | Planned 60 | |
| Daqing Petrochemical | Jun. 10 – Jul. 20, 2023 | 40 | Daqing Petrochemical: Jun. 10 – Jul. 20; Huake: Jun. 12 – Jul. 30. |
| Zhongke Refining & Chemical | Jul. 13 – Jul. 27, 2023 | 14 | Restarted on Jul. 27. |
| CNOOC Shell | Jul. 17 – Jul. 27, 2023 | 10 | Restarted on Jul. 27. |
| Baolai Petrochemical | Jul. 31 – Sep. 24, 2023 | 55 | Restarted on Sep. 24. |
| BASF-YPC | Sep. 5 – Sep. 25, 2023 | 20 | Product output started on Sep. 25. |
| Sichuan Petrochemical | Sep. 15 – Nov. 15, 2023 | 60 | |
| Shanghai Petrochemical | Started Sep. 25, 2023 | -- | Small-scale ethylene unit. |
| Zhenhai Refining & Chemical | Oct. 16 – Nov. 2, 2023 | 18 | Restarted on Nov. 2. |
| CNOOC Shell Phase II | Oct. 20 – Dec. 10, 2023 | 50 | |
| Guangzhou Petrochemical | Oct. 13 – Nov. 8, 2023 | 26 | |
| Maoming Petrochemical | Dec. 24, 2023 – Mar. 15, 2024 | 82 | Cracking Unit No. 1. |
| Shanghai Secco | Dec. 4 – Dec. 11, 2023 | 7 | |
| Qilu Petrochemical | Started Dec. 23, 2023 | ||
| Baolai Petrochemical | Dec. 27, 2023 – Jan. 4, 2024 | Est. 10 | |
| Guangzhou Petrochemical | Dec. 30, 2023 – Jan. 13, 2024 | 14 | |
| Sino-Korean Petrochemical | Jan. 16 – Jan. 26, 2024 | Est. 1 week | |
| BASF-YPC | Jan. 25 – Jan. 30, 2024 | ||
| Zhongke Refining & Chemical | Mar. 19 – May 29, 2024 | 70 | |
| Zhejiang Petrochemical | Mar. 5 – Mar. 22 // Apr. 2 – Apr. 30, 2024 | Two trains undergoing rotating maintenance. | |
| Central Plains Ethylene | Early Apr. – May 15, 2024 | Restarted May 15 | |
| Xinjiang Tianli | May 15 – Jul. 15, 2024 | 60 | |
| Zhejiang Petrochemical | Jun. 14 – Jun. 25, 2024 | 10 | |
| North Huajin Chemical | Jul. 12 – Oct. 8, 2024 | ~80 | |
| Dongming Petrochemical | Jul. 5 – Aug. 4, 2024 | 31 | |
| Jilin Petrochemical | Aug. 20 – Oct. 20, 2024 | 60 | |
| Fujian Union Petrochemical | Oct. 5 – Dec. 20, 2024 | 60 | |
| Sino-Korean Petrochemical | Oct. 10, 2024 – Jan. 8, 2025 | 90 | |
| BASF-YPC | Apr. 8 – Jun. 3, 2025 | 56 | Restarted Jun. 1; product output Jun. 4. |
| Sino-Saudi Tianjin | Apr. 21 – Jun. 6, 2025 | 46 | Restarted Jun. 6. |
| Hengli Petrochemical | May 13 – Jun. 10, 2025 | 28 | Restarted Jun. 10. |
| Yanshan Petrochemical | May 25, 2025 – TBD | Planned long-term shutdown | |
| Fujian Union Petrochemical | Jun. 5 – Jun. 20, 2025 | 16 | |
| Zhejiang Petrochemical | Jun. 23 – Aug. 10, 2025 | 48 | Restarted Aug. 10. |
| Wanhua Chemical Phase II | May 13 – Jun. 25, 2025 | 41 | |
| Dongming Petrochemical | Jul. 28 – Sep. 18, 2025 | 52 | Restarted Sep. 18. |
| Fushun Petrochemical | Aug. 15 – Oct. 28, 2025 | 74 | Restarted Oct. 28. |
| Zhenhai Refining & Chemical | Sep. 27 – Nov. 20, 2025 | 54 | Restarted Nov. 20. |
| Guangzhou Petrochemical | Oct. 13 – Dec. 8, 2025 | 56 | Restarted Dec. 8. |
| Central Plains Petrochemical | Oct. 25, 2025 – TBD | TBD | |
| Maoming Petrochemical | Nov. 26, 2025 – Jan. 10, 2026 | 45 | One unit under maintenance. |
| Shanghai Petrochemical | Nov. 25, 2025 – Jan. 25, 2026 | 62 | Restarted Jan. 25. |
| Sinochem Quanzhou | Nov. 25, 2025 – Jan. 26, 2026 | 64 | Restarted Jan. 26. |
| Dongming Petrochemical | Dec. 13 – Dec. 24, 2025 | 11 | Restarted Dec. 24. |
| United Petrochemical | Jan. 8 – Jan. 19, 2026 | 11 | Restarted Jan. 19. |
| Gulei Petrochemical | Mar. 9 – Jul. 19, 2026 | 132 | Restarted Jul. 19. |
| CNOOC Shell | Mar. 6 – Apr. 30, 2026 | 55 | Restarted Apr. 30. |
| Yangzi Petrochemical | May 5, 2026 – TBD | Planned restart Sep. 21. | |
| Sino-Korean Petrochemical | Jun. 4 – Jul. 15, 2026 | 39 | Restarted Jul. 15. |
| Hainan Refining & Chemical | Jun. 6, 2026 – TBD | 3–4 months | Planned shutdown duration: 3–4 months. |
| Shenghong Refining & Chemical | Jul. 1 – Aug. 17, 2026 | 48 | Restarted Aug. 17. |
| CNOOC Shell | Aug. 31, 2026 – TBD | ||
| Source: Chempricehub Information |
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