在球罐定期检验中应用TOFD技术验证出的缺陷并通过对缺陷图谱的分析, 再与常规方法检测结果比较, 判断这些缺陷为疑似裂纹, 经现场打磨结果为裂纹。经过三种检测结果与实际裂纹对比, 认为检测球罐危险性缺陷, 常规检测方法易漏检, 采用TOFD检测效果更佳。

TOFD detection technology is applied to the verification of excessive defects in the spherical tank periodical survey. A defect is determined to a suspected crack by analysis of defect map and the conventional test results, and the determination is proved to be true by the on-site grinding results. Compared with the three kinds of test results and the actual crack, the effect of TOFD detection is better than the conventional detection methods which the risk defects are easily undetected in the spherical tank.