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The low-pressure column of Unit 4 of the air separation unit in the completion project for the first phase of Shaanxi Yanchang China Coal Yulin Energy Chemical Co., Ltd. was officially lifted. Author/Source: Huahua Net – Coal Chemical Industry. Date: July 8, 2019. Clicks: 6. At around 9 a.m. on July 4, the completion project for the first phase of Shaanxi Yanchang China Coal Yulin Energy Chemical Co., Ltd. (the Yanchang Jingbian Phase II project), marked the beginning of the lifting of large-scale equipment for this completion project. According to reports, the low-pressure tower weighs 82 tons and has a diameter of 3.8 meters; it is a core component of the air separation unit. It was also the first large-scale equipment to be lifted as part of the YuNengHua project to complete the missing facilities in this plant. Together with the medium-pressure tower in this unit, it is responsible for the separation of oxygen and nitrogen, operating at normal temperatures below -175 degrees Celsius. For this lifting operation, a 650-ton crawler crane and a 250-ton crawler crane were used together; the installation height was 56 meters. This represented the lifting of the two low-pressure towers with the highest heights and greatest difficulty among those in the air separation plant. Before the lifting operation, the Engineering Department carried out thorough planning and technical verification, and worked together with units such as the Methanol Center, Ningbo Institute, and Shaanxi Chemical Construction to discuss the lifting plan, thereby ensuring its smooth execution from technical, quality, and safety perspectives. Panoramic view of the air separation unit in the Yulin Energy Chemical Project’s completion and improvement works. The successful lifting of this large-scale equipment marks the shift from the civil construction phase to the installation phase of the project, creating favorable conditions for the installation of the subsequent process pipelines in this completion and improvement project. On July 3, with the lifting of the first process pipeline in Pipeline Tunnel 502 completed, the installation of process pipelines for the LDPE/EVA units at the Polyolefins Center in the Yulin Energy Chemical Project commenced, 28 days ahead of the scheduled timeline. The polyolefin-based LDPE/EVA plant has a long construction period and complex construction processes, making it the plant with the latest completion time among all the projects under the improvement initiative. To ensure the successful completion of the project, the Polyolefins Center held several special meetings with the general contractor, Daqing Petrochemical Engineering Company, in order to scientifically optimize on-site construction, shorten the project timeline, make full use of existing resources to improve construction efficiency, and accelerate the installation of the process pipelines. Through the joint efforts of all parties, the first batch of process pipelines arrived on June 7, and the pipeline inspection was completed on June 10. Installation of the anti-corrosion equipment began on June 12, and the commissioning of the equipment at the anti-corrosion prefabrication plant was completed on June 25; thereafter, pipeline rust removal and anti-corrosion work started. The process pipeline construction workers arrived on June 30. At the beginning of July, the installation of the process pipelines was successfully commenced in accordance with the polyolefin requirements. The early installation of these process pipelines laid a solid foundation for the timely completion of the pipeline pressure testing phase in the LDPE/EVA plant, and it also ensured the successful completion of the plant by 2020. As of the end of June, 2.71 billion yuan had been invested in the completion and improvement works for the first phase of the project carried out by Shaanxi Yanchang China Coal Yulin Energy Chemical Co., Ltd. (the Yanchang Jingbian Phase II project); 645 million yuan was invested in June alone, and the construction of various facilities is progressing steadily.