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Device for detecting small defect of pipeline and method for detecting center and diameter of defect

A detection device and defect center technology, which is applied in the field of pipeline detection, can solve the problems of low detection sensitivity of small defects, and achieve the effects of shortening the detection cycle, improving maintenance efficiency, and improving accuracy

Active Publication Date: 2018-10-16
天津精仪精测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this detection method has low sensitivity to the detection of small defects.

Method used

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  • Device for detecting small defect of pipeline and method for detecting center and diameter of defect
  • Device for detecting small defect of pipeline and method for detecting center and diameter of defect
  • Device for detecting small defect of pipeline and method for detecting center and diameter of defect

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Experimental program
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Effect test

Embodiment 1

[0048] A detection device for tiny defects in pipelines, see Figure 1-Figure 5 , the detection device includes: a detector 1 in the pipeline, a Hall element 2 and a magnet 5 are installed on the detector 1 in the pipeline (the embodiment of the present invention takes a cylindrical magnet 5 as an example for illustration, and during specific implementation, the embodiment of the present invention This is not limited), the model of the Hall element 2 used in this detection device is SS495A1, it has three pins, and its physical figure is as follows figure 2 shown.

[0049] The front view and cross-sectional view of the detector 1 in the pipeline are as follows figure 1 and image 3 As shown: In order to avoid short circuit, each Hall element 2 is equipped with three pin slots 3 to respectively place the above three pins.

[0050] Such as image 3 As shown, the circular hole on the inner wall of the detector 1 in the pipeline is used to place a cylindrical magnet 5, and the H...

Embodiment 2

[0053] The scheme in embodiment 1 is explained in principle below in combination with specific numerical values, see the following description for details:

[0054] The schematic diagram of the experimental device for the steel pipe test is shown in Figure 4 As shown: the detector 1 in the pipeline needs to be pushed forward by the pipeline fluid 13, and the wall of the device is attached to the wall of the pipeline.

[0055] In the in-pipe detector 1, the circumferential distance between the Hall elements 2 is 10-20mm, and the radius of the in-pipe detector 1 is equal to the inner diameter of the pipe.

[0056] The system block diagram of the detection device is as follows Figure 5 As shown: the battery 6 supplies power to the power management module 7, and the power supply to the Hall element 2 and the single-chip microcomputer 9 is realized through the power management module 7;

[0057] When the body of the pipeline detector 1 moves smoothly in the pipeline 11, under t...

Embodiment 3

[0063] A detection method for the center and diameter of pipeline tiny defects, see Figure 6 and Figure 7 , the detection method includes:

[0064] first to Figure 6 and Figure 7 The obtained magnetic field characteristic signal curve is analyzed, and the magnetic field characteristic signal curve is analyzed, and the place with obvious depression is called a trough;

[0065] Identify the trough C in the magnetic field characteristic signal curve, and the amplitude corresponding to the trough C is H; then find two points A and B whose corresponding amplitudes are h1 and h2 respectively, where Record the time t corresponding to A and B respectively 1 and t 2 and the time t corresponding to the trough C 3 , denoting the moving speed of the detector in the pipeline as v, then:

[0066] The position of the center of the tiny defect in the pipeline = v*t 3 ;

[0067] Diameter of tiny defect in pipeline = k*(t 2 -t 1 )*v; among them, k needs to be calibrated in advan...

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Abstract

The invention discloses a device for detecting a small defect of a pipeline and a method for detecting a center and a diameter of the defect. Hall elements and magnets are mounted on a detector in thepipeline, wherein each Hall element is equipped with three pin slots for respectively placing three own base pins; circular holes in an inner wall of the detector in the pipeline are used for the placement of the magnets; the Hall elements are vertically inserted into the three pin slots; the Hall elements in the pin slots are mounted in parallel with the magnets in the circular holes; a distancebetween the Hall element and the magnet should be greater than 2 mm; the magnets can magnetize a pipe wall; when the detector in the pipeline passes through the small defect of the pipeline, the relative magnetic permeability of the small defect of the pipeline is large, a line of magnetic force near the small defect of the pipeline bends, a magnetic field signal induced by each Hall element is amagnetic field characteristic signal; the magnetic field characteristic signal is identified to identify a situation of the defect of the pipeline, locate a position of the defect of the pipeline andperform pipeline maintenance. Moreover, the method provided by the invention further detects the center and the diameter of the small defect of the pipeline to improve precision of detecting the small defect of the pipeline.

Description

technical field [0001] The invention relates to the field of detection in pipelines, in particular to a detection device for tiny defects (blind holes or through holes) in pipelines, and a detection method for the centers and diameters of tiny defects. Background technique [0002] Pipeline transportation is a special transportation mode of oil and gas resources. With the increasing demand for oil and gas resources in the economy and society, the pipeline transportation industry has become a huge industrial system, which occupies an important strategic and economic position in the development of all countries in the world. With the continuous improvement of the pipeline transportation system, the length of the pipeline line continues to increase, and safety issues have been paid more and more attention. At the same time, how to detect the conditions in the pipeline to ensure the stable operation of the transportation system has become the focus of the industry. For pipeline...

Claims

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Application Information

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IPC IPC(8): G01N27/83G01B7/12
CPCG01B7/12G01N27/83
Inventor 黄新敬燕玉田封皓李健陈世利曾周末
Owner 天津精仪精测科技有限公司
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