Abstract: The general layout and the optimization of the basic design by the detailed design are introduced for the riser I-tube and foundation of the flexible dynamic riser jumper on an ultra-larger deepwater FPSO. The design of riser I-tube and foundation takes into account FPSO on-site operation, extreme environment, riser jumper offshore installation, riser accident, FPSO damage and ocean tow conditions. A quantitative analysis of the risk of the oil and gas leakage and the deflagration chain hazard has been carried out for the riser shutdown valves according to the enterprise standard requirements of the oil company. The design blast overpressure of the riser I-tube and foundation is determined to analyze the strength of riser I-tube and foundation against blast accidents. The passive fire protection design of the riser I-tube and foundation is also carried out. The fatigue life of the riser I-tube and foundation is finally predicted based on the analysis method of the cumulative fatigue damage.

Key words: floating production, storage and offloading system (FPSO), flexible dynamic riser jumper, riser I-tube, foundation, blast, passive fire protection, fatigue

摘要： 以一艘深水超大型FPSO柔性动态跨接软管的导管及基座结构为例,介绍立管导管及基座的总体布置和详细设计对基本设计的优化。立管导管及基座结构设计考虑了FPSO在位操作、极端环境、跨接软管海上安装、立管事故、FPSO船舱破损和远洋拖航等工况。按某石油公司企业标准要求开展了立管关断阀油气泄漏扩散、燃爆连锁风险定量分析,确定了立管导管及基座结构设计爆炸超压,分析了立管导管及基座结构抗爆炸事故工况的强度,进行了立管导管及基座结构被动防火设计。基于疲劳累积损伤的分析方法,预报了立管导管及基座结构的疲劳寿命。

关键词: 浮式生产储油卸油装置, 柔性动态跨接软管, 立管导管, 基座, 爆炸, 被动防火, 疲劳