天然气管道合于使用评价研究与应用

发布时间：2018-03-29 05:16

本文选题：天然气管道　切入点：腐蚀　出处：《东北石油大学》2017年硕士论文

【摘要】：管道输送是天然气的最主要输送方式,由于天然气遇火易燃易爆,一旦管道失效断裂,天然气泄露到空气中,接触火源,容易引发灾难性的事故,因此管道结构的完整至关重要。管道服役过程中,由于腐蚀、管体变形等缺陷是管道完整性受损,管道承压能力下降,为管道失效造成安全隐患;为了防止管道失效,工程实际中常采用调节压力,修复或更换管段等管道维护措施。合于使用评价正是以检测的管道缺陷数据为基础,基于严格的理论分析和计算,确定含缺陷结构的安全可靠度及结构的剩余强度和安全服役寿命,为管道维护措施提供科学的参考依据。本文对管道的检测数据进行了分析,针对管道腐蚀缺陷,管道不良地质条件引发的管体变形进行了研究。首先,介绍分析目前较为常用的管道缺陷评价方法,然后基于这些方法建立了缺陷管道的有限元模型,计算得到了管道的受力变形,并基于相应的应力应变判断准则,确定缺陷管道的剩余强度和安全状况。基于概率统计的方法,根据开挖测量得到管道腐蚀深度,得到了腐蚀管道可靠度与剩余寿命曲线;基于蒙特卡洛法,对管道腐蚀受力进行模拟,定量地给出了腐蚀管道的失效概率;最终确定了天然气管道规定风险水平条件下的腐蚀管道剩余寿命。本文的研究成果为天然气管道的检测、维修和更换工作提供了科学的决策意见。
[Abstract]:Pipeline transportation is the most important way to transport natural gas. Since natural gas is flammable and explosive in case of fire, once the pipeline fails and breaks, natural gas leaks into the air and contacts the source of fire, which can easily lead to catastrophic accidents. Therefore, the integrity of the pipeline structure is very important. During the pipeline service, due to the defects such as corrosion and deformation of the pipe body, the integrity of the pipeline is damaged, and the pressure bearing capacity of the pipeline is reduced, which causes the pipeline failure to cause a hidden danger of safety; in order to prevent the pipeline from failing, In engineering practice, pipe maintenance measures such as regulating pressure, repairing or replacing pipe sections are often adopted. The evaluation of pipeline defects is based on the measured data of pipeline defects, and based on strict theoretical analysis and calculation. The safety reliability, residual strength and service life of structures containing defects are determined, which provides a scientific reference for pipeline maintenance measures. This paper analyzes the inspection data of pipelines, and aims at the corrosion defects of pipelines. The pipe deformation caused by poor geological conditions of pipeline is studied. Firstly, the commonly used pipeline defect evaluation methods are introduced, and then the finite element model of defective pipeline is established based on these methods. The stress and deformation of pipeline are calculated, and the residual strength and safety condition of defective pipeline are determined based on the corresponding criterion of stress and strain. Based on the method of probability and statistics, the corrosion depth of pipeline is obtained according to excavation measurement. The curve of reliability and residual life of corroded pipeline is obtained, and the failure probability of corroded pipeline is quantitatively given by simulating the corrosion force of pipeline based on Monte Carlo method. Finally, the remaining life of corroded pipeline under the specified risk level of natural gas pipeline is determined. The research results in this paper provide scientific decision advice for the inspection, maintenance and replacement of natural gas pipeline.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973

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