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On April 13, the construction of the underground pipeline network for the \"National Standard IV\" ethylene plant in Tianjin Nangang, carried out by Sinopec Refining & Chemical Engineering’s Tenth Construction Company, commenced in full swing, marking the entry of this project into its peak construction phase. It is understood that the “Guo Si Set” project comprises four units: one for the hydrogenation of 600,000 tons per year of pyrolysis gasoline, one for aromatic extraction with a capacity of 380,000 tons per year, one for butadiene extraction with a capacity of 150,000 tons per year, and one for the production of MTBE/butylene-1 with a capacity of 13.5 tons per year. These units form an important part of the Tianjin Nangang ethylene project and represent one of the key components in its construction. Since the project commenced, Shijian Company has closely adhered to the overall project construction timeline set by the owner and the general contractor, making every effort to ensure that the drawings and materials for the underground pipeline system are available in time, thereby creating favorable conditions for the timely construction of these pipelines. “The total length of underground pipeline construction for the “Guo Si Set” project is estimated to be around 14,000 meters, and it faces various challenges such as high groundwater levels and complex geological conditions. To this end, the project department of Shijian Company organized things scientifically and made thorough plans, continuously optimizing the construction plan for underground pipeline networks. By adopting a \"first-piece sample\" strategy, it ensured that the construction work remained of high quality at all times. Before the construction of the underground pipeline network, the project team conducted a comprehensive and thorough assessment of potential risks in the construction area. They carried out safety emergency drills related to temporary power usage, fire prevention, and the prevention of soil and rock collapses, with the aim of enhancing the safety awareness of all employees involved in the project and strengthening the safety controls for the construction of the underground pipeline network.