It is a difficult work for the pipeline worker how to detect the defects of the pipeline.Conventional inspection can not solve the difficultness for the road crossing pipeline with a tube cover.

• 虽然目前大量采用了管道内检测技术，但某些管道系统，如不具备内检测的管道、公路穿越管道、场站管道，使用常规检测及内检测方法很难实现。