双层整体式PLET舷侧安装分析

Analysis of Integral PLET Installation Along Vessel Broadside with Pipe-in-Pipe

为便于深水双层整体式管道终端(Pipeline End Termination,PLET)的安装设计,以海洋石油201船的舷侧下放装置和南海某项目为基础,研究双层整体式PLET舷侧安装的悬挂和下放两个关键阶段的安装分析模型和主要参数。对比悬挂分析等效单层管模型与双层管模型,结果表明此2种建模方法均适用。双层管模型相关接触参数(接触刚度、接触面积、锚固件位置)对海底管道受力影响较小且能输出内外管接触载荷,较适用于安装设计。在下放过程中,管道载荷对PLET的重心位置和附加质量水动力系数较为敏感,在安装设计中需关注。

In order to facilitate the installation design of deep-water integral Pipeline End Termination(PLET)with pipe-in-pipe,the installation analysis model and main parameters of two key stages of hang-off and lowering of PLET are studied based on PLS system of HYSY 201 vessel and a project in the South China Sea.The comparison between the equivalent single pipe model and pipe-in-pipe model of the hang-off analysis shows that both modeling methods are applicable.The contact parameters(contact stiffness,contact area and anchor position)of the pipe-in-pipe model are of little influence on the load of the pipe and can output the contact load of the inner and outer pipes,which are suitable for installation design.The pipeline load during the lowering process is sensitive to the center of gravity and the added mass hydrodynamic coefficient of PLET,so it needs attention in the installation design.