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| Finite Element Analysis and Application of Complete LNG Unloading Arm Under Earthquake Loads Conditions |
| Received:September 18, 2024 Revised:December 12, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2025.03.016 |
| KeyWord:liquefied natural gas unloading arm earthquake loads finite element analysis structure optimization |
| Author | Institution |
| HAO Sijia |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
| XIAO Li |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
| QIU Zaoyang |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
| YANG Liang |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
| ZHEN Cong |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
| CHEN Tuanhai |
CNOOC Gas & Power Group Co., Ltd., Beijing , China |
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| Abstract: |
| The work aims to carry out afinite element analysis and design optimization for the complete structure of the loading arm based on the stress situation of the large-diameter unloading arm under standby conditions. When establishing a finite element model, the actual motion state of the unloading arm was greatly restored. The vibration mode and natural frequency of the unloading arm structure were obtained through a modal analysis, to provide a basis for analyzing the vibration characteristics of the unloading arm and calculating earthquake loads. In addition, a finite element calculation and analysis was performed on the complete structure of the unloading arm under the worst-case conditions of OBE and SSE earthquake load combinations, to obtain the stress and deformation of the unloading arm under load, and finish the structural strength verification. The established finite element model had high accuracy. According to the results of the finite element calculation and analysis, a flexible slip ring was proposed to replace the rigid lining for optimization, reducing the load on the pipeline system and rotating joints; The material optimization selection and structural safety factor enhancement design of some structures were completed under guidance, and a plan was proposed to increase the wall thickness of steel pipes to improve the overall safety and reliability of the unloading arm structure. The unloading arm of this structural form can meet the design requirements under the earthquake load limit state, and the relevant research results can provide a technical support for the design and engineering application of independent technology unloading arms. |
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