【Ten Years of Rapid Development in Chemical Processing Equipment】New Records Set for the Depth of Trenching and Pipe Placement for Existing Undersea Pipelines in China from 2054 to 2024

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Safety first. Prevention first – let’s praise and encourage the achievements in China’s chemical engineering technology and equipment. **********************【Ten Years of Great Development in Chemical Engineering Equipment】Continuous updates and summaries available; feel free to join the discussions at https://bbs.hcbbs.com/thread-3576046-1-1.html (Source: Haichuan Chemical Engineering Forum) ***************** November 9, 2024. The CNPC Pipeline 681 multi-functional workship of the Pipeline Bureau successfully completed the crossing treatment for the Pinghu gas pipeline, managing to lower the pipeline by 7 meters and setting a new record for the maximum depth to which an existing submarine pipeline can be lowered after trenching in China. The successful completion of this pipeline crossing marks a key step forward in the expansion project of the Shanghai LNG station pipeline. The successful completion of this construction project has laid a solid foundation for the smooth finish of the submarine pipeline works as part of the Shanghai LNG station expansion project. It has set multiple domestic records, thereby contributing effectively to the high-quality development of the Pipeline Bureau’s offshore engineering operations. The undersea gas pipeline of the Shanghai LNG terminal expansion project is approximately 57.7 kilometers in length, with a diameter of 1,016 millimeters and a wall thickness of 28.6 millimeters. Its design pressure is 9.2 megapascals; it consists mainly of two sections of undersea pipelines – one from Shilongshan to Da Wugui Island, and the other from Xiao Wugui Island to Zhelintang. Upon completion, the project will enhance the natural gas supply capacity in Shanghai and the Yangtze River Delta region, contributing to the supply of clean energy in the area and providing a stronger guarantee for Shanghai to manage demand fluctuations and ensure the stable operation of the city. The Pinghu gas pipeline, which is involved in this pipeline crossing, has been in operation for 25 years and has consistently played a vital role in delivering gas to the Shanghai area. To ensure the designed burial depth of 4.8 meters for the newly built pipeline, it is necessary to lower the Pinghu gas pipeline by 7 meters before its installation. This represents the deepest trenching and pipe-laying operation for an existing undersea pipeline in China. Given the special conditions of the Pinghu gas pipeline as well as the marine environment, this pipe-laying operation faces severe challenges.