变频选频法检测和评价钢质燃气管网腐蚀损坏

Variable Frequency and Frequency Modulation Technique and Evaluation of Corrosion Failure of Steel Gas Pipelines

采用变频选频法技术 ,对大连某区燃气管线实施全面的普查和检测 ,测得的管道绝缘电阻值在14 5 0～ 10 0 0 0Ω·m2 之间。根据质量分级标准可知 ,防护层质量在“良”以上的管段占 85 .85 %以上。通过开挖管道验证 ,该测量方法所测结果准确 ,并以此为依据 。

The variable frequency and frequency modulation technique was applied in the general investigation and examination of fuel gas pipelines. The electric resistance of the pipe insulation measured was between 1450 and 10,000m 2. Base upon the quality rating system, the protection coating of 85.85% of the pipelines was within the excellency category. The open-ditch examination showed that the value measured by this technique was consistent with the open ditch measurement. The corrosion of overall pipeline network was evaluated on this basis.