海底管道腐蚀速率预测及计算分析

为了监测海底管道腐蚀状态,预测管线腐蚀速率,评估管道强度变化情况,通过海底管道腐蚀产物的检测分析,指出海管内部发生气体腐蚀。结合超声导波检测、测厚抽查等方法,通过对腐蚀缺陷进行统计分析,得出海底管道剩余壁厚、腐蚀深度范围等数据,并采用OLGA 7.1软件建立海底管道腐蚀预测模型,计算分析出海底管道的腐蚀速率。结果表明:海管内部结垢后易发生垢下腐蚀,海底管道腐蚀深度为0～6.9 mm,腐蚀速率为0.015～0.022 mm/a,腐蚀速率在管道高程上升段变小、高程下降段变大。研究成果可为海底管道监测与维护提供依据。

Prediction and Calculation Analysis of Corrosion Rate of Submarine Pipelines

In order to monitor the corrosion state of the submarine pipeline, predict the corrosion rate of the pipeline and evaluate the change of pipeline strength, through the detection and analysis of corrosion products of submarine pipeline, it is pointed out that gas corrosion occurs inside the sea pipe. Through the statistical analysis of corrosion defects, the remaining wall thickness and the corrosion depth range of submarine pipeline are obtained by means of magnetic particle detection of weld seam, and the corrosion prediction model of submarine pipeline is established by using OLGA7.1 software. The corrosion rate of submarine pipeline is calculated and analyzed.The results show that the corrosion of submarine pipelines is easy to occur after scaling. The corrosion depth of submarine pipelines is 0~6.9 mm, and the corrosion rate is 0.015~0.022 mm/a. The corrosion rate decreases in the rising section of pipeline elevation and increases in the falling section of pipeline elevation.It provides basis for monitoring and maintenance of submarine pipeline.