Residual magnetism detection device in buried pipeline

Abstract

The invention discloses a residual magnetism detection device in a buried pipeline, and belongs to the technical field of pipeline demagnetization. The device comprises a driving assembly, a detectionassembly, a magnetic field detection probe and a mileage measurer, wherein the driving assembly is electrically connected with the first end of the detection assembly, a battery pack is arranged inside the driving assembly, a signal processor is arranged inside the detection assembly, the magnetic field detection probe is located on the outer wall of the detection assembly, the magnetic field detection probe is electrically connected with the signal processor, and the mileage measurer is electrically connected with the second end of the detection assembly. By the adoption of the residual magnetism detection device, magnetic field signals in a conveying pipeline and the moving path of the device in the conveying pipeline are detected, processed and recorded, technicians can know magnetic field data and mileage data inside the conveying pipeline, magnetic field intensities corresponding to different areas inside the conveying pipeline can be determined, then different reverse magnetic field intensities are set for different areas in the subsequent demagnetization process, accurate demagnetization can be achieved, and the demagnetization effect is good.

Description

technical field [0001] The present application relates to the technical field of pipeline demagnetization, in particular to a residual magnetism detection device in buried pipelines. Background technique [0002] In the process of oil and gas transportation, it is usually necessary to carry out regular magnetic pigging operations or internal magnetic flux leakage inspections on the transportation pipelines to remove scale, dirt and ferromagnetic substances in the transportation pipelines, and to find serious defects and hidden dangers in the pipelines to protect the pipelines. safe operation. However, since both the magnetic pig and the magnetic flux leakage internal detector are equipped with strong magnets, after the pigging or internal inspection is completed, the pipe wall of the pipeline may be magnetized, and even the entire pipeline is severely magnetized. This phenomenon can be called remanence, which will seriously affect the subsequent welding quality. Therefore,...

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Problems solved by technology

[0004] In the above-mentioned technologies, it is difficult to achieve ideal results in local demagnetization, and rely on manual experience to set the magnetic field strength of the demagnetization device. Because the residual magnetism in different areas in the pipeline is different, for example, the residual magnetism in the concave-convex area is relatively large, and the residual magnetism in the uniform area is relatively large. Smaller, and the residual magnetism of different pipelines is also different. Therefore, demagnetization based on the magnetic field strength determined by manual experience cannot achieve accurate demagnetization. It is likely that reverse magnetization or demagnetization cannot Accurately grasp the demagnetization effect

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