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首页> 外文会议>ASME international conference on ocean, offshore and arctic engineering >STRAIGHTENER SETTINGS FOR UNDER-STRAIGHT RESIDUAL CURVATURE OF REEL LAID PIPE
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STRAIGHTENER SETTINGS FOR UNDER-STRAIGHT RESIDUAL CURVATURE OF REEL LAID PIPE

机译：卷轴铺设管的直直剩余曲率的直直方弯曲

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摘要

The pipeline inplace buckling design by residual curvature method for controlled thermal expansion during operation is a novel and cost effective method for initiating multiple expansion loops for a reel-laid pipeline. The controlled thermal expansion will be initiated and managed by planned buckle sites at regular intervals of say, 1km spacing with residual curvature corresponding to 0.20%-0.25% residual strain. The pipelines installed by the reel Lay process are required to be straightened by a reverse curvature process which results in pipeline with nominally zero curvature and axial strain. In order to achieve a residual strain of 0.20%-0.25%, two options are available either to over-straight or under-straight the pipelines. This paper discusses the methodology used laying of pipeline with 0.20%-0.25% residual strain at pre-determined intervals by an under-straightening process with a combination of a central 40m under straight section with a residual strain of 0.2%-0.25% and a 15m transition section on either side of the central section, at lkm intervals. The paper presents the methodology used to determine the settings for the top straightener module of reel lay vessel using finite element analyses, as the equipment settings for under or over straight pipes are not readily available from analytical methods. The optimum settings were obtained after substantial number of FEA simulations allowing for the statistical range in pipe material properties from "strong" to "weak" and these settings are used in reeling trials to make necessary adjustments. The residual strain, out-of-straightness and axial force distributions in pipe sections for straight, under-straight and transition sections are discussed. The paper discusses how these settings were used on-board the vessel and the modifications and adjustments required to select the final settings for the under-straight curvature for the field development of Statoil Skuld project as a case study. This paper briefly discusses the vessel equipment specific features and limitations that may need to be taken into consideration in finite element analyses to optimise the straightener settings for residual strain.
机译：通过剩余曲率法进行屈曲设计，用于操作期间的受控热膨胀的屈曲设计是一种新颖且成本有效的方法，用于启动卷轴管道的多个膨胀环。通过规则的间隔，通过定期间隔开始和管理受控的热膨胀，其间隔1km间距，残留曲率对应于0.20％-0.25％的残余菌株。需要由卷轴铺设工艺安装的管道通过反向曲率过程伸直，从而导致具有标称零曲率和轴向应变的管道。为了达到0.20％-0.25％的残留菌株，可以使用两种选择，以直接直线或直线管道。本文讨论了用0.20％-0.25％的管道铺设管道的方法，以预矫正过程以预矫正过程，其中40m的中央40m的组合，残留菌株为0.2％-0.25％和a中央部分两侧的15M过渡部分，处于LKM间隔。本文介绍了使用有限元分析确定卷轴敷料船的顶部矫正器模块的方法的方法，因为在分析方法中不容易获取或直接管道的设备设置。在大量的FEA模拟之后获得最佳设置，允许管道材料的统计范围从“强”到“弱”，并且这些设置用于卷取试验以进行必要的调整。讨论了用于直线，直线和过渡部分的管部中的残余应变，直线度和轴向力分布。本文讨论了如何在船上使用这些设置以及为案例研究中选择外部曲率的最终设置所需的修改和调整作为案例研究。本文简要讨论了有限元分析中可能需要考虑的船舶设备特定特征和限制，以优化残留应变的直观设置。

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