管道内腐蚀直接评估技术与实践应用

发布时间：2018-02-24 07:14

本文关键词： 管道内腐蚀临界角直接评估完整性　出处：《石油科学通报》2016年03期 　论文类型：期刊论文

【摘要】：内腐蚀的直接评估(Internal Corrosion Direct Assessment,ICDA)技术是用于评价通常输送干气、但可能短期接触湿气或游离水(或其他电解液)的输气管道完整性的系统方法,适用于不能开展内检测的管道。其包括4个步骤:预评价、间接检测、直接检测、后评价。ICDA评估管道水聚集和内腐蚀的可能性,从而找出首个最有可能的腐蚀区域位置,如果这个区域位置通过验证没有发现腐蚀,则其他下游部位出现水聚集或腐蚀的可能性很小。本文提出了ICDA的步骤和方法,对陕京天然气管道一线陕西段神森站至府谷压气站段进行了ICDA评估,评价管道全长52.09 km,按照冬夏季天然气输送量不同,计算得出了管道水积聚析出的临界角冬季1月份为6.17°,夏季7月份为为1.97°。分析沿线高程数据,得出全线高程倾角分布图,选择多个倾角(大于临界角)较大的高风险区域位置开挖,发现管道无明显壁厚减薄,管道状况良好。通过内腐蚀评估可进一步确定管道的内部状况,对于不能实施内检测的管道安全状况评估具有重要意义。
[Abstract]:The Internal Corrosion Direct Assessment technique is a systematic method for evaluating the integrity of a gas pipeline that normally conveys dry gas but may be exposed to moisture or free water (or other electrolytes) for a short period of time. Applicable to pipes that cannot be tested internally. It consists of four steps: pre-evaluation, indirect detection, direct detection, post-evaluation. ICDA assesses the possibility of pipeline water accumulation and internal corrosion, thus identifying the location of the first most likely corrosion area. If the site of this area is verified to have no corrosion, the probability of water accumulation or corrosion in other downstream areas is very small. This paper presents the steps and methods of ICDA. The ICDA evaluation of Shensen station to Fugu gas pressure station section in Shanjing natural gas pipeline is carried out. The total length of pipeline is 52.09 km, according to the different natural gas transportation capacity in winter and summer, the total length of the pipeline is 52.09 km. The critical angle of pipeline water accumulation and precipitation is 6.17 掳in winter and 1.97 掳in summer July in winter. In this paper, we select a number of high risk areas with larger dip angle (greater than critical angle) to excavate, and find that there is no obvious wall thickness thinning and the pipeline is in good condition. The internal condition of the pipeline can be further determined by internal corrosion evaluation. It is of great significance to evaluate the pipeline safety condition which can not be detected internally.
【作者单位】：中国石油大学(北京);中石油北京天然气管道有限公司;昆仑能源有限公司;
【分类号】：TE988.2

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