【History of Haichuan Pipelines】In 2022, the Dongdong crude oil pipeline with a transport capacity of 15 million tons was put into operation successfully

The Dongdong Pipeline has an annual designed oil transport capacity of 15 million tons and a total length of 365 kilometers. It is primarily used to transport imported crude oil unloaded at the Dongjiakou port area in Qingdao. It connects at the Dongying station to the Dongling double-track line (Dongying–Linyi), from where the oil is sent to the Luning Pipeline (Linyi–Yizheng), serving refineries and petrochemical enterprises in Shandong Province as well as those along the Yangtze River. Once put into operation, this pipeline will gradually replace older crude oil pipelines such as the Donghuang Line (Dongying–Huangdao), which have been in use for over 30 years. It will increase the oil transportation capacity by 2.6 million tons per year, with a daily transport volume of 43,000 tons. It will play an important role in the comprehensive management of old pipelines by the Pipeline Network Group, the optimization of the oil and gas pipeline network in Shandong region, and the unified allocation of imported crude oil resources.

During the project construction process, **Pipeline Network Group adhered to the approach of integrating construction with management, overcame numerous challenging obstacles, and completed the construction tasks in a high-quality, safe, and efficient manner. During the construction process of passing through the steep cliffs of the Taiyi Mountains in Zhucheng, a jacking machine with a small diameter of 1350 millimeters was used to successfully pass through 358 meters of extremely hard rock, setting a domestic record for jacking operations in very hard rock over long distances using machines with small diameters. During construction in environmentally sensitive areas such as the Qingzhou Yanghe Wetland Park and the Dawu groundwater enrichment zone in Zibo, measures such as increasing the thickness of pipe walls, improving the anti-corrosion standards, and implementing leak-proof protection were taken to enhance the intrinsic safety of the pipes, protect the surrounding ecological environment, and create green pipes. Starting at 9:18 on August 15, the Dongdong pipeline began to enter operation phase section by section, beginning from the Dongjiakou oil transfer station. For this commissioning, intelligently developed pipeline inspection equipment that ranks among the best in China and is advanced at the international level, as well as a pipeline geological disaster monitoring and early warning system, were used for the first time. These tools enabled rigorous testing of the weld quality and geometric stress deformation points of the pipeline itself, and on August 24, the entire line was successfully commissioned in just one attempt.