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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering, Jun 23-28, 2002, Oslo, Norway >COMPARATIVE STRUCTURAL ANALYSES BETWEEN SANDWICH AND STEEL PIPELINES FOR ULTRA-DEEP WATER
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COMPARATIVE STRUCTURAL ANALYSES BETWEEN SANDWICH AND STEEL PIPELINES FOR ULTRA-DEEP WATER

机译：超深水夹层管和钢质管道之间的比较结构分析

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摘要

Pipe-in-pipe systems are usually composed of two concentric metal pipes with or without an insulation material in the annulus region. Design requirements for ultra-deep water pipelines motivated the development of a new pipe-in-pipe conception in which the annulus is filled with materials that combine low cost, adequate thermal insulation properties and good mechanical resistance. The aim of this ongoing research project is to evaluate the structural performance of sandwich pipes with two different options of core material. Because of their wide availability and relatively low costs, the materials considered in this study were cement and polypropylene for the annulus, with pipes made of API X-60 grade steel. In this paper, a three-dimensional finite element model considering material and geometric nonlinear behavior was developed. This numerical model was used to perform a parametric study to determine the collapse envelopes of different pipe-in-pipe configurations under combined bending and external pressure. The collapse envelopes were compared with others obtained for steel pipelines of equivalent collapse pressure. The study showed that the pipe-in-pipe systems with either cement or polypropylene cores are feasible options to ultra-deep water pipelines fulfilling concomitantly both the requirements of structural resistance and thermal insulation.
机译：管中系统通常由两个同心金属管组成，在环带区域中有或没有绝缘材料。超深水管道的设计要求推动了新的管中管概念的发展，在该概念中，环空填充了具有低成本，足够的隔热性能和良好的机械阻力的材料。该正在进行的研究项目的目的是评估具有两种不同芯材选择的夹芯管的结构性能。由于它们的广泛可用性和相对较低的成本，因此在本研究中考虑的材料是用于环空的水泥和聚丙烯，其管道由API X-60级钢制成。本文建立了考虑材料和几何非线性行为的三维有限元模型。该数值模型用于进行参数研究，以确定在弯曲和外部压力共同作用下不同管道结构的塌陷范围。将倒塌包络与等效倒塌压力的钢管获得的其他包络进行了比较。研究表明，具有水泥芯或聚丙烯芯的管道系统是超深水管道的可行选择，可同时满足结构阻力和隔热要求。

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