FPSO电气间模块和基座结构抗爆炸分析

Structural analysis of FPSO electrical house module and foundation against blast

FPSO电气间模块是高耸的全封闭箱型建筑物。FPSO上部模块总体布置设计采用以电气间模块作为防火、防爆屏障对油气处理工艺模块与主电站、公用系统模块进行隔离的方案。在FPSO工程设计中,开展了上部模块油气泄漏扩散、燃爆连锁风险定量分析及控制策略优化研究。应用理想化的“压强-时间”曲线模拟爆炸冲击荷载。对电气间模块主体和基座、FPSO主甲板支墩和止升爪进行了抗爆炸工况线性静力分析和时域非线性动力分析,计算了基座结构强度和塑性应变,分析结果满足API、船级社规范和企业标准要求。对液压顶升模块更换弹性基座的工况进行了分析。FPSO电气间模块和基座结构抗爆炸分析可确保FPSO和电气间模块主体结构设计的本质安全。

FPSO electrical house modules are high and fully enclosed box type buildings.In the general arrangement design of FPSO topside modules,the electrical house modules are used as the fire and blast barriers,so the oil and gas process modules are isolated from the main power modules and utilities modules.The quantitative risk analyses of oil and gas leakage diffusion from the topside modules,deflagration chain hazards and optimization of safety barrier control strategy are carried out in FPSO design.The idealized“Pressure-Time”curves are used to simulate the blast impact loads.The anti-blast linear static analysis and time-domain nonlinear dynamic analysis of the main body and foundation of the electrical house modules,FPSO hull stools and anti-uplift stopper are carried out.The structural strength and plastic strain of the foundation are calculated,and the analysis results meet the rule requirements of API,Classification Society and Company’s General Specifications.The foundation under hydraulic jacking condition for replacing elastomeric bearing is analyzed.The anti-blast analysis of FPSO electrical house module and foundation can ensure intrinsic safety of main structure design of FPSO electrical house module.