Qualification of Mechanically Lined Pipe MLP with High Frequency Welded HFW Host Pipe for Subsea Applications with Reeling Installation

Craig Macdonald, J. Safari, S. Anderson
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Abstract

Known as HFW-MLP, Mechanically Lined Pipe (MLP) with High Frequency Welded (HFW) host pipes are potentially the most cost-effective bi-metallic pipes for subsea pipelines when corrosion resistant alloys (CRA) are required. However, HFW-MLP has a very limited track record for subsea applications. This paper details a recent programme to qualify MLP with HFW host pipes. The qualification programme has been performed in accordance with DNVGL-ST-F101 (2017) and internal supplementary requirements for reelability and weldability. It considers material testing of HFW-MLP at each manufacturing stage and product qualification including full-scale reeling simulation, anti-corrosion coating simulation and girth welding. Qualification is supplemented with a detailed evaluation of the manufacturing process HFW-MLP is compared to traditional MLP which is supplied with seamless carbon steel as the host pipe or backing steel. This novel product lowers the supply cost, reducing the Capital Expenditure (CAPEX) for subsea pipeline projects. Detailed evaluation of mechanical test results and dimensional inspections using laser profiling assess the impact of the HFW host pipe longitudinal seam weld and conclude that there is no detrimental effect on the performance of the completed MLP. A comprehensive review of full-scale reeling simulations, coating simulations and welding trials is completed, with the conclusion that an HFW host pipe does not adversely affect the ability of the MLP product to be girth welded and to withstand the plastic deformation exerted upon the product during reel-lay installation. It is concluded that HFW-MLP is qualified for subsea pipeline static applications via the reel-lay, S-Lay or J-lay installation methods. The qualification of HFW-MLP provides a more cost-effective solution for the development of corrosive subsea fields by reducing overall product supply and installation costs.
海底卷绕装置用高频焊接HFW主管机械衬管MLP的鉴定
高频焊接(HFW)主管的机械内衬管(MLP)被称为HFW-MLP,当需要耐腐蚀合金(CRA)时,它可能是海底管道中最具成本效益的双金属管道。然而,HFW-MLP在海底应用方面的记录非常有限。本文详细介绍了用HFW主机管对MLP进行鉴定的最新方案。资格认证程序已按照DNVGL-ST-F101(2017)和内部可释放性和可焊性补充要求进行。它考虑了HFW-MLP在每个制造阶段的材料测试和产品鉴定,包括全尺寸缫丝模拟,防腐涂层模拟和环焊。HFW-MLP与传统的MLP进行了比较,传统MLP采用无缝碳钢作为主管或衬钢。这种新型产品降低了供应成本,降低了海底管道项目的资本支出(CAPEX)。对机械测试结果进行详细评估,并使用激光剖面进行尺寸检查,以评估HFW主管纵向焊缝的影响,并得出结论,对完成的MLP的性能没有不利影响。通过对全尺寸卷绕模拟、涂层模拟和焊接试验的全面评估,研究人员得出结论,HFW主机管不会对MLP产品的环焊能力产生不利影响,也不会对卷绕安装过程中施加在产品上的塑性变形产生不利影响。结论是,HFW-MLP通过reel-lay、S-Lay或J-lay安装方法可以满足海底管道静态应用。HFW-MLP的认证通过降低整体产品供应和安装成本,为腐蚀性海底油田的开发提供了更具成本效益的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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