An Axial Magnetic Field Signal Compensation System for Internal Detection of Ferromagnetic Pipeline Defects

Abstract

The invention relates to an axial magnetic field signal compensation system for internal detection of ferromagnetic pipeline defects, including a Hall effect sensor system, an operational amplifier system, a multi-way switch, and a probe bracket system. It can realize the collection of axial, radial and circumferential magnetic field signals of defects at the same time, and use the radial and circumferential magnetic field information as the compensation of the axial magnetic field. Realize the comprehensive detection and identification of defect magnetic field signals, improve the detection ability and detection accuracy of defects, and effectively avoid pipeline safety hazards caused by missed detection and misjudgment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas gathering and transportation, and relates to an axial magnetic field compensation system for internal detection of ferromagnetic pipeline defects. Background technique [0002] Oil and gas pipelines play a key role in the transportation of oil and gas energy. In order to ensure the safe operation of pipelines, pipelines should be inspected regularly. The internal magnetic flux leakage detection technology of pipelines is currently a commonly used detection technology. Compared with other detection technologies, magnetic flux leakage detection The technology does not require couplant, is less affected by external interference, and has a fast detection speed, which is suitable for rapid detection of large-area and long-distance pipelines. [0003] The pipeline magnetic flux leakage internal detection system applies the principle of magnetic flux leakage detection, and uses the medium conveyed in...

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Problems solved by technology

[0005] However, this method can only provide a single information of the axial magnetic field, and cannot realize the complete detection of pipeline defects, and because the circumferential stress inside the pipeline is about twice the axial stress, axial defects are more important for oil and gas pipelines. It is more harmful than circumferential defects; in addition, as the grade of pipeline steel becomes higher, the pressure of the pipeline increases, and new pipelines use more factors such as straight welded pipes and seamless pipes, which greatly increases the cost of new pipelines. risk

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