CNOOC Engineering, Yantai Engineering Large Research Institute Apply for LNG Seismic Isolation Design Related Patents, Achieve LNG Storage Tank Seismic Isolation Design Transformation, Enhance Performance and Prevent Resonance

March 21 News, according to the State Intellectual Property Office, China National Offshore Oil Corporation (CNOOC) Engineering Co., Ltd. and Yantai Harbin Engineering University Research Institute applied for a patent titled “Three-Dimensional Seismic Isolation System Design Method for Ultra-Large LNG Storage Tanks.” The application publication number is CN121683227A, application number CN202511818066.6. The publication date is March 17, 2026, and the application date is December 4, 2025. Inventors include Han Xiaokang, Zhao Menglong, Chen Hang, Zhang Liangfeng, Deng Bin, Xiao Cao, Wang Shun, Zhang Shan, Luo Zhongcheng, Li Yang, Cai Xuesong, Qu Xianqiang. The patent agency is Shandong Xinguo Patent Agency Co., Ltd., with patent agent Gu Mingyue. Classification codes are G06F30/20 and G06F119/14.

Patent Abstract: The invention relates to the field of seismic resistance technology for civil engineering and storage tanks, specifically a method for designing a three-dimensional seismic isolation system for ultra-large LNG storage tanks. The steps include: obtaining tank parameters to calculate load-bearing and stiffness; verifying deformation to determine rubber layer properties; setting dampers to calculate period and damping force; analyzing energy distribution ratios to optimize design and determine the three-dimensional period ratio. The invention proposes a formula-based and parameterized 3D seismic isolation design method, transforming LNG tank seismic systems from experience-based to calculation-based design. It introduces viscous damping units to improve vertical energy dissipation, enhances vertical vibration control and system stability, and establishes a coupling optimization mechanism between vertical and horizontal directions through a period coordination factor. This effectively avoids multi-modal resonance, features a clear process, controllable parameters, and repeatable calculations. It can be widely applied to different tank capacities and heavy equipment foundations, with significant engineering application and promotion value.

CNOOC Engineering was established on April 20, 2000, and listed on the Shanghai Stock Exchange on February 5, 2002. Its registered and office address is in Tianjin. It is a leading enterprise in China’s offshore oil and gas engineering sector, providing professional engineering and technical services for offshore oil and gas development with full industry chain advantages.

CNOOC Engineering’s main business includes providing design, onshore manufacturing, offshore installation, commissioning, and maintenance services for offshore oil and gas resource development. Its industry classification is Petrochemical - Oilfield Services - Oil & Gas and Refining Engineering, involving concepts such as combustible ice, oil and gas reform, and natural gas.

In 2025, CNOOC Engineering showed excellent operational performance, with revenue reaching 27.163 billion yuan, ranking 1st/2nd in the industry, surpassing the second-ranked BomiTech’s 1.9 billion yuan. The industry average and median are both 14.532 billion yuan. Net profit was 2.112 billion yuan, also ranking first in the industry, far exceeding BomiTech’s 61.15 million yuan. The industry average and median are 1.087 billion yuan.

Recent patent applications by China National Offshore Oil Corporation (CNOOC) Engineering include:

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