The Analysis about Corrosion and Corrosion Control Technologies of Pipelines

        Abstract: Pipeline, as a reliable and economical infrastructure, plays a very important role in many industries like petrol, chemical and nuclear industries. Corrosion is the major indication of pipeline failure. Both internal and external corrosions are very effective in damaging pipelines. Thus, pipeline corrosion becomes a severe danger of the running pipeline system nowadays, which can lead to transported matter escapes, conduits ruptures and reduced lifetimes and all that. The disastrous consequences brought by these accidents are severe, such as economic loss and casualty as well as environment pollution. Therefore, controlling of pipeline control is very vital. To control pipeline corrosion successfully and prolong pipeline life effectively, this article separately introduces corrosion phenomena and corrosion mechanism in detail. After this, the needful prediction methods and detection techniques of the pipeline corrosion were presented, by which the reasons of the corrosion can be analyzed. In order to reduce the loss caused by corrosion, predicting the corrosion rate is very meaningful and significant. Besides, the detection techniques can also be applied to estimate and evaluate the corrosion control measures outcome, which make great contribution to future corrosion control. This paper proposes effective countermeasures concerning the corrosion control based on the corrosion mechanism, introduces internal corrosion control techniques such as natural gas desulphurization and dehydration, internal anticorrosion coating, corrosion inhibitor etc, and external corrosion inhibition measures such as anti-corrosive layer, catholic protection and connecting line etc.

         Key words: Pipeline; corrosion control; prediction model; detection techniques

      管道是运用于很多工业中经济有效的运输设备，而腐蚀则是预示管道失效的最适指标.内部腐蚀及外部腐蚀均极易于破坏管道。因此，管道腐蚀是管道安全运行的极大隐患。这种现象可造成运输品泄漏、管道破裂、管道寿命缩短等事故，从而引起重大的经济损失、人员伤亡和环境污染等灾难性后果。因此，提出管道的腐蚀控制措施是至关重要的。为有效控制腐蚀发生，延长管道使用寿命，本文介绍了管道腐蚀现象及原因。并在此基础上，阐述了管道腐蚀控制技术中不可或缺的管道腐蚀预测技术及检测技术。管道腐蚀预测评估技术可用于研究管道腐蚀原因，从而降低管道腐蚀带来的损失。而检测技术不仅可用于研究腐蚀原因，还可用于判断和评价腐蚀控制措施的效果，从而为后期腐蚀治理提供依据。本文提出有效延缓管道腐蚀的管道腐蚀控制技术，包括对天然气进行脱硫脱水处理、涂内防腐层及添加缓蚀剂等内部腐蚀控制技术以及采用涂防腐绝缘层、阴极保护和连接线等外部缓蚀措施。

      关键词：管道；腐蚀控制；预测模型；检测技术