纯内压作用单缺陷腐蚀海底管道安全分析研究

Safety Analyzing Research on Single Defect Submarine Pipe of Internal Pressure Loading Only

通过载荷抗力系数法和许用应力设计法,对腐蚀海底管道强度进行评估,以两种方法对挪威船级社的DNV规范[1]的案例进行计算,评估纯内压载荷下的海底管道工作的安全性;在此基础上将海底管道视为弹塑性材料,对受压腐蚀海底管道通过ABAQUS进行有限元模拟,并对海底管道进行应力分析并探讨影响管道峰值应力的缺陷几何参数的敏感性。研究结果表明:海底管道在安全工作应力下可将管道视为弹性材料,且在缺陷纵向长度不小于宽度的情况下,管道峰值应力随着缺陷深度和缺陷宽度的增加分别减小及增加。

The assessment to the strength of submarine corroded pipeline bases on two methods mentioned in DNV Guidance: calibrated safety factor approach and allowable stress approach. This essay was introduced both approaches to evaluate a case which as one of examples of DNV Guidance and the safety of corroded pipeline was analyzed by these assessing methods. Basing on the assessments,this paper also emulated the situation of corroded pipeline by analysis of finite element model that was operated in ABAQUS while pipeline was seen as elastic-perfectly plastic material. Moreover,geometry parameter’s sensibility that has influence in maximum pressure of pipeline had been discussed by emulation. This research proved that corroded pipeline could be analyzed as an elastic material while running in safe working pressure. As the longitudinal length of corroded pipeline no less than corroded width,maximum pressure of pipeline would increase and reduce respectively by the increase of corroded depth and width.