Bottom plate leakage is a critical failure mode in storage tank engineering, often causing environmental contamination and high remediation costs. To improve structural integrity and leak detection, double-layer steel bottom systems have been widely adopted and standardized in API 650 and EN 14015. This study evaluates five typical configurations (Structures A–E) using finite element analysis with both 2D and 3D models under hydrostatic loading. Structure D shows the most uniform stress distribution, while Structure E achieves minimal deformation with greater complexity. Parametric studies investigate the effect of rubber pad thickness and elastic modulus on stress and deformation, revealing limited influence on overall performance. A modulus-material mapping framework is established, correlating elastic modulus to commercially available elastomers such as EPDM, polyurethane, and HDPE. Polyurethane materials with elastic moduli between 10–50 MPa are identified as offering the best balance between mechanical performance and economic feasibility. This research provides theoretical and practical insights for optimizing double-layer tank bottom structures, supporting better material selection, safer designs, and more efficient long-term operation of liquid storage systems.
Key Words
cost-performance evaluation; double-layer tank bottom; elastomeric materials; finite element analysis; hydrostatic loading; rubber pad design; structural optimization
Address
Haijun Deng, Lei Dong, Shuping Guo, Yong Yu, Fan Li — Beijing Branch, China Petroleum Engineering Co., Ltd., CPE Building, No. 8 Xinxi Road, Haidian District, Beijing 100085, China
Shubing Zhao, Xinaer Mandaiye — Beijing Datong Rising Engineering Software Development Co., Ltd., No. 5-162, Huanke Middle Road, Jinqiao Science and Technology Industrial Base, Tongzhou Park, Zhongguancun Science and Technology Park Tongzhou District, Beijing 101113, China
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