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Pipeline demagnetizer based on permanent magnet structure and application of pipeline demagnetizer

A demagnetization and pipeline technology, applied in the direction of permanent magnets, magnets, magnetic objects, etc., can solve the problems of residual magnetism not being eliminated, influence of magnetic flux leakage detection accuracy, adverse effects of pipeline maintenance and welding, etc., to achieve convenient pipeline maintenance and emergency repair. Effect

Active Publication Date: 2017-12-01
SHANGHAI JIELING MAGNETIC MATERIAL & DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The pipeline magnetic flux leakage detection technology will cause a new problem: the oil and gas pipeline is saturated and magnetized during the detection, and the residual magnetism remains in the pipeline matrix and has not been eliminated
[0007] 1) Pipes with residual magnetism will affect the accuracy of subsequent magnetic flux leakage detection
[0008] 2) Adverse effects on pipeline repair welding
However, the device uses electromagnets for demagnetization, which cannot be used in long-distance pipelines.

Method used

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  • Pipeline demagnetizer based on permanent magnet structure and application of pipeline demagnetizer
  • Pipeline demagnetizer based on permanent magnet structure and application of pipeline demagnetizer
  • Pipeline demagnetizer based on permanent magnet structure and application of pipeline demagnetizer

Examples

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Effect test

Embodiment 1

[0063] A pipeline demagnetization device based on a permanent magnet structure, its structure is as follows figure 1 As shown, it consists of an iron core 1 and permanent magnets 2 distributed on the iron core 1 .

[0064] The iron core 1 can be made of magnetically permeable material to form a magnetic circuit; it can also be partially non-magnetically permeable. The selected material is mainly for the purpose of forming a suitable magnetic circuit. The permanent magnet 2 used is a single annular magnet, and a radially magnetized annular magnet is used. The annular magnet can be a magnetic ring magnetized in the entire radial direction, or spliced ​​by multiple magnetic steels. The single ring magnets are placed at intervals along the axial direction of the center piece, and the magnetization directions are alternately reversed one by one. The magnetization performance of the single ring magnets arranged along the axial direction of the center piece is gradually reduced, an...

Embodiment 2

[0067] A pipeline demagnetization device based on a permanent magnet structure, its structure is as follows image 3 As shown, it consists of an iron core 1 and permanent magnets 2 distributed on the iron core 1, which is roughly the same as in Embodiment 1, except that the permanent magnet 2 used in this embodiment is a series structure composed of double ring magnets. Two ring magnets radially magnetized and magnetized in opposite directions form a series group. Each group of double ring magnets consists of two ring magnets with radial magnetization and opposite magnetization directions. The radial ring magnets can be spliced ​​by multiple magnetic steels, or can be a whole radial magnetization ring. Each group of double ring magnets forms a polarity in a certain direction in the tube wall. Multiple groups of ring magnets are placed at intervals along the axial direction, and the magnetization directions formed in the tube wall are alternately reversed in groups one by one,...

Embodiment 3

[0069] A pipeline demagnetization device 0 based on a permanent magnet structure. The device is a built-in structure and is used for demagnetization inside a long pipeline. It is pulled forward by pressure in the pipeline so that the magnetized pipeline undergoes the process of alternating attenuation magnetic field to achieve demagnetization.

[0070] When performing magnetic pigging operation or magnetic flux leakage detection operation on long-distance natural gas and oil pipelines, the magnetic pig 5 will move forward along the pipeline under the action of the pressure inside the pipeline. A strong magnet will be installed on the magnetic pig 5, and wherever the equipment goes, the pipe wall will be saturated and magnetized, so that the entire long-distance pipeline will be severely magnetized.

[0071] For long-distance natural gas and oil pipelines, the pipeline demagnetization device 0 adopts a built-in structure. The demagnetization device can be a single device, which...

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Abstract

The invention relates to a pipeline demagnetizer based on a permanent magnet structure and application of the pipeline demagnetizer. The pipeline demagnetizer comprises a center piece and permanent magnets distributed on the center piece, wherein magnetic fields with alternatively varied directions are formed in the wall of the pipeline in the axial direction from front to back; the intensity of the magnetic field is decreased gradually; the demagnetizer can adopt a built-in structure or a built-out structure and is applied for pipeline demagnetization. Compared with the prior art, the pipeline demagnetizer has the advantage that a group of steady alternative attenuation magnetic fields are formed in space, and the magnetized pipeline and the group of alternative attenuation magnetic fields have relative displacement in space, so that the wall of the pipeline goes through the group of alternative attenuation magnetic fields, therefore, the purpose of demagnetization can be achieved.

Description

technical field [0001] The invention relates to a demagnetization device, in particular to a pipeline demagnetization device based on a permanent magnet structure and its application. Background technique [0002] With the development of oil, natural gas and other energy and chemical industries, transmission pipelines have been widely deployed all over the world, and the total length of pipelines of various diameters is difficult to count. These pipelines are affected by the objects to be transported and the surrounding environment, or damaged by human factors such as war, and corrosion and thinning, perforation and fracture have occurred, resulting in leakage or even explosion. [0003] The in-pipeline detection technology can put equipment with detection devices in the pipeline without affecting the normal operation of the pipeline, effectively detect deformation, corrosion and other metal defects in the pipeline, and accurately locate them, providing a guarantee for the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00H01F7/02
CPCH01F7/021H01F7/0221H01F13/006
Inventor 张慧欣张诗渊汪小青
Owner SHANGHAI JIELING MAGNETIC MATERIAL & DEVICES
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