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首页> 外文会议>ASME international pipeline conference 2008 >Maximize Flow Capacity on Corroded Liquid Pipelines: a Massive Defect Assessment Methodology Based upon Hydraulic Simulations and ILI Results
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Maximize Flow Capacity on Corroded Liquid Pipelines: a Massive Defect Assessment Methodology Based upon Hydraulic Simulations and ILI Results

机译：最大化腐蚀液体管道上的流量：基于水力模拟和ILI结果的大规模缺陷评估方法

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Many aging liquid pipeline systems face demands to increase viscosity and/or flow capacity requirements. This paper presents a methodology to assure old pipelines' up-rating serviceability by means of an optimizing integrity evaluation procedure where metal loss defects, reported by smart pig inspection, are assessed based upon maximum pressure profiles. The referred methodology comprises the following steps:rn1. simulate the most severe pressure profiles scenarios for both steady and transient states and define maximum construct pressure envelopes;rn2. build up representative equations of the maximum pressures observed at each profile point to steady/transient conditions;rn3. assess pipe defects population reported by recent smart pig inspection considering the maximum pressure and the appropriate failure model;rn4. determine rehabilitation hydrostatic testing pressures required to validate the new operating conditions;rn5. re-assess pipe defects population considering the hydrostatic testing pressures.rnTo illustrate the methodology application, three case studies are presented, all carried out on pipelines older than 30 years. In order to accomplish the increased required capacity, four additional pump facilities were design and erected. Over thirty thousand metal loss defects (from ILI reported population greater than one million) were effective assessed for hydrostatic testing and operating conditions - considering individual pressure calculation. Regarding operating conditions, repair scenarios were constructed considering rehabilitation for a timerninterval of 5 years (based on estimated corrosion growth). The hydraulic simulations and the metal loss defect assessment where performed using, respectively, Pipeline STONER Simulator 9.3 and PLANPIG 2.0 software's.rnThis methodology has been successfully applied by PETROBRAS TRANSPORTE S.A. on revamping of corroded pipelines: despite the cases' corrosion damage severity and the lack of conservatism on hydrostatic testing modeling, no test break was observed at the two tested lines and the required repairs number was dramatically reduced as compared to the traditional "as good as new" rehabilitation approach.
机译：许多老化的液体管道系统面临增加粘度和/或流量需求的需求。本文提出了一种通过优化完整性评估程序来确保旧管道的升级维修性的方法，该过程根据最大压力曲线对由智能清管器检查报告的金属损失缺陷进行评估。所述方法包括以下步骤：rn1。模拟稳态和瞬态下最严重的压力分布场景并定义最大构造压力包络线;建立在每个剖面上观察到的最大压力的代表方程，以表示稳态/瞬态条件; rn3。评估最近的智能生猪检查报告的管道缺陷数量，并考虑最大压力和适当的故障模型; rn4。确定验证新的运行条件所需的修复水压试验压力; rn5。考虑静水压力测试压力，重新评估管道缺陷数量。为了说明该方法的应用，提出了三个案例研究，所有案例研究均在30年以上的管道上进行。为了实现增加的所需容量，设计并架设了另外四个泵设备。考虑到单独的压力计算，有效评估了超过三万种金属损失缺陷（来自ILI报告的人口超过一百万），用于水压测试和操作条件。关于操作条件，在考虑了5年的间隔修复后（根据估计的腐蚀增长）构建了修复方案。液压仿真和金属损失缺陷评估分别使用Pipeline STONER Simulator 9.3和PLANPIG 2.0软件进行。rn这种方法已被PETROBRAS TRANSPORTE SA成功地用于腐蚀管道的修复：尽管情况严重且缺乏腐蚀关于静水压测试模型的保守性，与传统的“如新”修复方法相比，在两条被测管线上均未观察到测试中断，并且所需的维修次数大大减少。

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