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首页> 外文会议>Proceedings of the ASME India oil and gas pipeline conference 2017 >FREE SPAN RECTIFICATIONS IN SUBMARINE PIPELINE PROJECTS - A CASE STUDY
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FREE SPAN RECTIFICATIONS IN SUBMARINE PIPELINE PROJECTS - A CASE STUDY

机译：海底管道项目中的自由跨度整流-案例研究

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Seabed features along a subsea pipeline route are highly stochastic. Free spans may be created in the pipelines due to seabed irregularities, subsequent scouring, and horizontal movements of pipeline during operation. It is quite common to encounter free spanning sections along the pipeline route from the very start till the end. Spanning of subsea pipelines is a primary area of concern not only in the detailed design and installation stage but also during the operation stage. For ensuring the pipeline safety during operation, underwater surveys must be conducted at suitable intervals. The frequency of such pipeline free spanning surveys depends on the operators' interest and the statutory requirements. The static and dynamic characteristic of the pipeline spans should be investigated to ensure that the pipeline can be operated within acceptable safety levels. The unsupported spans that incur static as well as dynamic loads on the pipeline, may lead to vortex-induced vibrations and ultimately fatigue, and thus affecting the pipeline serviceability and design life. Vortex induced vibrations are not allowed to occur in the operation life as far as the conventional design is considered but DNV - RP - F105 allows the onset of vortex induced vibrations provided that the fatigue damage due to vortex induced vibrations doesn't exceed the allowable values. Pipe soil interaction has a huge impact on the pipeline design as well as the pipeline service life. Analysis of the existing conditions and stress levels based on the site-specific surveys and environmental data needs to be carefully carried out for determining the acceptability of spans and the effective intervention works if required. Hydrological studies and numerical modeling may also need to be carried out for sediment transportation analysis and for proper assessment & quantification of sea bed erosion, trenching and backfilling requirements. In the present work, the acceptable criteria in terms of static and dynamic stresses and fatigue damage limits due to vortex induced vibrations as per DNV - RP - F105 have been discussed. Further comprehensive analysis philosophy and the criticalities in the design analysis for free spanning of subsea pipeline are presented. A case study based on an offshore project in western India has been presented involving the major project issues. The main areas of concerns & challenges faced are examined in detail. Further study has been conducted for the other available strategic solutions in the VIV mitigation and rectification of free spanning sections.
机译：海底管线沿线的海底特征是高度随机的。由于海床的不规则性，随后的冲刷以及操作期间管道的水平运动，可能会在管道中产生自由跨度。从开始到结束沿管道路线遇到自由跨接段是很常见的。海底管道的跨越不仅在详细的设计和安装阶段，而且在操作阶段都是主要关注的领域。为了确保操作期间的管道安全，必须在适当的时间间隔进行水下检查。此类管道自由跨度检查的频率取决于运营商的兴趣和法定要求。应该研究管道跨度的静态和动态特性，以确保管道可以在可接受的安全级别内运行。无支撑的跨度会在管道上产生静态和动态载荷，可能导致涡流引起的振动并最终导致疲劳，从而影响管道的使用寿命和设计寿命。在考虑了传统设计的前提下，不允许在使用寿命内产生涡流激振，但DNV-RP-F105允许涡流激振的发生，但前提是由于涡流激振引起的疲劳损伤不超过允许值。管道与土壤的相互作用对管道设计以及管道使用寿命有着巨大的影响。需要根据特定地点的调查和环境数据仔细分析现有条件和压力水平，以确定跨度的可接受性，并在需要时进行有效的干预工作。还可能需要进行水文研究和数值模拟，以进行沉积物运输分析以及对海床侵蚀，挖沟和回填要求进行适当的评估和量化。在本工作中，已经讨论了根据DNV-RP-F105的静态和动态应力以及由于涡流引起的振动而导致的疲劳损伤极限的可接受标准。提出了进一步的综合分析理念和海底管道自由跨度设计分析中的关键性。提出了一个基于印度西部海上项目的案例研究，涉及重大项目问题。详细研究了面临的主要关注和挑战领域。进一步研究了VIV缓解和矫正自由跨节的其他可用战略解决方案。

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