Method for comprehensively detecting defects of metal pipe in non-contact dual-source magnetic field

A metal pipeline, non-contact technology, applied in the direction of electric/magnetic exploration, measuring devices, material magnetic variables, etc., to achieve the effects of increased sensitivity, easy on-site implementation, and low operational risk

Inactive Publication Date: 2017-07-21
武汉地大华睿地学技术有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a non-contact dual-source magnetic field comprehensive detection method for metal pipeline defects, which overcomes various disadvantages in the existing contact method for detecting local defects of metal pipelines

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  • Method for comprehensively detecting defects of metal pipe in non-contact dual-source magnetic field
  • Method for comprehensively detecting defects of metal pipe in non-contact dual-source magnetic field
  • Method for comprehensively detecting defects of metal pipe in non-contact dual-source magnetic field

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Embodiment Construction

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0028] Such as figure 1 As shown, a non-contact dual-source magnetic field comprehensive detection method for metal pipeline defects, including the following steps,

[0029] S1, determine the detection route of ground non-contact detection according to the direction and orientation of the buried metal pipeline, and arrange a series of measuring points on the detection route;

[0030] S2, carry out continuous electromagnetic detection along the detection route, respectively detect the electromagnetic response characteristics of each measuring point of the metal pipeline under the natural magnetic field and artificial magnetic field;

[0031] S3, taking different measuring points on the detection route as the time tr...

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Abstract

The invention relates to a method for comprehensively detecting defects of a metal pipe in a non-contact dual-source magnetic field. The method comprises the following steps: S1, determining a detection route for non-contact detection on the ground, and laying a series of detection points; S2, at each detection point, detecting electromagnetic response characteristics of the metal pipe in a natural magnetic field and an artificial magnetic field respectively; S3, drawing electromagnetic response characteristic curves of the metal pipe in the natural magnetic field and the artificial magnetic field respectively; S4, performing differential amplification on the electromagnetic response characteristic curve in the artificial dual magnetic field to obtain a gradient modulus abnormality distribution map; S5, according to the gradient modulus abnormality distribution map and the electromagnetic response characteristic curve in the natural magnetic field, determining a comprehensive index; S6, performing contrastive analysis on the electromagnetic response characteristic curves of the metal pipe in the natural magnetic field and the artificial dual magnetic field, and with the combination of the comprehensive index, determining positions and levels of the defects of the metal pipe. By the method, various drawbacks in the conventional method for detecting local defects of the metal pipe in a contact mode are overcome.

Description

technical field [0001] The invention relates to the field of metal pipeline flaw detection, in particular to a non-contact dual-source magnetic field comprehensive detection method for metal pipeline defects. Background technique [0002] At present, the method of contact detection of local defects of metal pipes is generally used to detect local defects of metal pipes. It mainly uses professional detection equipment (internal inspection flaw detector) to record the magnetic field stress defects of pre-magnetized metal pipes. The method includes cleaning equipment and internal inspection flaw detectors, flushing and cleaning the interior of metal pipes and ensuring the complete smoothness of the section, allowing the flaw detector to pass through while magnetizing the pipe wall, recording and storing magnetic field anomalies according to the dispersed and saturated magnetic fields, and interpreting all The information obtained in order to determine the location and character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82G01V3/08
CPCG01N27/82G01V3/081
Inventor 梁庆九
Owner 武汉地大华睿地学技术有限公司
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