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首页> 外文会议>International Conference on Ocean, Offshore and Arctic Engineering >EFFECT OF PRE-STRAIN ON BENDING STRAIN CAPACITY OF MECHANICALLY LINED PIPE
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EFFECT OF PRE-STRAIN ON BENDING STRAIN CAPACITY OF MECHANICALLY LINED PIPE

机译：预塑料对机械衬砌管弯曲应变能力的影响

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The high demand for subsea transportation of corrosive wellhead produced fluids has created interest in economical mechanically lined pipes (MLP) made of external carbon steel and a thin internal layer of corrosion resistant alloy (CRA). The bending strain capacity of an MLP, where a CRA liner is adhered to a carbon steel host pipe by means of an interference fit, is often governed by the liner wrinkling limit state. Although the strain capacity of the MLP with a typical 3 mm thick liner is enough to withstand bending to strains encountered during installation with the S-lay or J-lay method, the liner is at risk of wrinkling when the MLP is subjected to higher bending strains during reel-lay. To allow reeled installation, the liner strain capacity is enhanced by either increasing the liner thickness or pressurizing the MLP during installation. In the former approach, the required liner thickness is proportional to the pipe diameter. For larger diameter MLPs, it is therefore often more economical to select a 3 mm thick liner and flood and pressurize an MLP to ensure liner stability during reeling. However, the MLP may need to be depressurized and partially drained during installation to allow welding a structure, performing reel-to-reel connection or pipeline recovery which impose bending strain on a plastically pre-strained and depressurized pipeline. Furthermore, reeled pipelines may be depressurized subsea while subjected to bending loads from operation. Although there is a history of research into the limit loads and failure modes of MLPs, there is still no comprehensive guidance on determining the risk of liner wrinkling in plastically pre-strained MLPs. In this paper, an approach is proposed for evaluating the strain capacity and assessing the risk of liner wrinkling after an MLP, subjected to plastic bending during reeled installation at elevated pressure, is depressurized and subjected to installation loads during offshore intervention or operational loading in service. The combined effect of strain history at elevated pressure, reeling-induced ovality, bending direction after depressurization, differential pressure, temperature and residual strain is discussed. The recommendations for further work are also given.
机译：用于腐蚀性井口产出流体的海底输送的高需求已经创造在由外部碳钢和耐腐蚀合金的薄内层（CRA）的经济机械衬管（MLP）的兴趣。一个MLP，其中CRA衬垫通过过盈配合的方式附着于碳钢主机管的弯曲应变能力，通常由衬垫起皱极限状态支配。虽然MLP的具有典型的3mm厚的衬垫的应变能力足以承受弯曲到安装用S型铺设或J-铺设方法过程中所遇到的菌株，所述衬里是在起皱的风险时的MLP经受较高的弯曲卷筒型铺设过程中的菌株。以允许卷绕安装，衬垫应变能力是通过增加衬垫厚度或安装期间加压MLP增强。在前者的方法中，所需要的衬垫厚度正比于管的直径。对于较大直径的MLP中，因此常常更经济选择3mm厚的衬里和洪水和加压的MLP，以确保卷取期间衬垫稳定性。然而，MLP可能需要在安装过程中被减压，并部分地排出，以允许焊接结构，在进行卷到卷轴或连接管道，其恢复强加塑性预应变，并加以减压管道弯曲应变。此外，虽然受到来自操作弯曲载荷卷绕管道可以被减压海底。虽然有研究史进的MLP的极限载荷和失效模式，仍然在确定衬垫起皱的塑性预应变的MLP的风险没有全面的指导。在本文中，一种方法被建议用于评估应变能力和MLP后评估衬垫起皱的风险，进行塑性在升高的压力卷绕在安装过程中的弯曲，被减压，并在服务近海干预或操作加载期间进行安装载荷。应变历史的在升高的压力将合并的效果，缫丝诱导的椭圆度，弯曲减压后方向，压差，温度和残余应变进行了讨论。进一步开展工作的建议也给出。

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