南海深水FPSO模块支墩设计与分析

Design and Analysis of Deep Water FPSO Module Stool in the South China Sea

针对中国南海海况恶劣,浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)在南海服役多年后,少数支墩由于建造工艺出现裂纹问题,以南海某深水FPSO为研究对象,对常用箱式支墩形式进行改进优化设计。运用有限元方法对箱式模块支墩和改进后的丰字形模块支墩与十字交叉带裙边支墩进行评估,对不同支墩形式进行强度分析、变形分析和疲劳分析,并对不同支墩的工艺进行综合对比,结合工程实践和有限元计算,给出支墩推荐设计方案。结果表明,优化后的十字交叉带裙边支墩结构强度和疲劳均优于箱式支墩,同时还具有便于加工组装的特点,最终选定十字交叉带裙边支墩方案。

Aimed at the problem that the South China Sea is under harsh conditions,after years of service,cracks are found on the module stools of Floating Production Storage and Offloading(FPSO)due to construction technology troubles,taken a deep-water FPSO in the South China Sea as the research object,the box-type form of the commonly used FPSO module stool is improved and optimized.The box-type module stool,the improved Fengzi module stool and the cross belt skirt stool are evaluated by the finite element method.The strength analysis,deformation analysis and fatigue analysis of different stool forms are carried out.The construction technologies of different stools are comprehensively compared.Combined with engineering practice and finite element calculation,the recommended module stool is given.The results show that the optimized cross belt skirt stool is of better performance in strength and fatigue,it also has the characteristics of easy processing and assembly,and the scheme of cross belt skirt stool is selected.