Research on the External Detection Technology for Buried Steel Pipelines Based on Multi-Frequency Electromagnetic
- Resource Type
- Conference
- Authors
- He, Renbi; Chen, Jinzhong; Meng, Tao; He, Renyang
- Source
- 2019 International Conference on Electronic Engineering and Informatics (EEI) Electronic Engineering and Informatics (EEI), 2019 International Conference on. :26-29 Nov, 2019
- Subject
- Computing and Processing
multi-frequency electromagnetic
defect identification
ansys finite element
pipeline external inspection
- Language
In order to realize the non-excavation continuous detection of metal loss defects of buried steel pipelines without internal testing conditions, a research was conducted about the the external detection technology for buried steel pipelines based on multi-frequency electromagnetic by the theoretical analysis and the ansys finite element simulation. This paper was mainly about the the influence of pipeline metal loss defects on the multi-frequency alternating current passing through the pipeline and the influence of pipeline metal loss defects on the different frequency magnetic fields around the pipeline, which laid the foundation for the development of multi-frequency electromagnetic-based buried steel pipeline metal loss defect detection equipment and pipeline defect identification. The results showed that the pipeline metal loss defects played a great influence on the direction and magnitude of the flowing current. When the metal loss defect existed in pipeline, the magnetic field signals around the pipeline were abnormal. There was a significant difference between the magnetic field changes caused by the inner wall defect and the outer wall defect. Therefore, it was possible to determine whether the pipeline was defective by analyzing the variation law of the magnetic field around the pipeline and to determine whether the defect was located on the inner wall or the outer wall of the pipeline.