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Gas pipeline crack electromagnetical ultrasonic oblique wave guide detecting method

A natural gas pipeline, electromagnetic ultrasonic technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problem of not considering the influence of magnetostrictive effect, etc.

Inactive Publication Date: 2009-05-06
TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The electromagnetic ultrasonic transducer used in this device generates ultrasonic waves based on eddy current and magnetic field force, without considering the influence of the magnetostrictive effect that must exist in the ferromagnetic steel material natural gas pipeline wall
In addition, the patent does not specifically describe how to generate ultrasound and the type of ultrasound

Method used

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  • Gas pipeline crack electromagnetical ultrasonic oblique wave guide detecting method
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  • Gas pipeline crack electromagnetical ultrasonic oblique wave guide detecting method

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Embodiment Construction

[0026] In the present invention, a printed circuit board-based three-split zigzag coil and an NdFeB permanent magnet block are used to form the attached figure 1 For the electromagnetic ultrasonic transducer unit shown, the cycle number of the three-split broken-line coil is 2 to 5. For the attached figure 2 In the specific form, the period number of the coil is 3.5. The constant bias magnetic field provided by the permanent magnet is in the range of 1~1.5T, the typical value is 1T. Its direction is parallel to the wire direction of the broken line coil and is located inside the pipe wall. This configuration determines the bias magnetic field and The alternating eddy currents induced by the coil are parallel, so there is no Lorentz force effect, that is, no ultrasonic waves will be generated in non-ferromagnetic conductive materials. For the natural gas pipeline wall constructed of ferromagnetic steel material, this arrangement will generate shear ultrasonic waves under the ...

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Abstract

The invention discloses an electromagnetic ultrasonic inclined guiding wave checking method of natural gas pipeline cracks, which is characterized in that electromagnetic ultrasonic energy exchanger units are composed of split-type broken line coils and permanent magnet blocks, and are arranged on an inner checking device in the pipeline along the inclined direction, and generated ultrasonic guiding waves have a certain checking sensitivity on cracks of each direction on the spreading route of the ultrasonic guiding waves. The inclined ultrasonic guiding wave and the supporting guiding wave after crack action of a single emitting electromagnetic ultrasonic energy exchanger unit are received by two annular receiving energy exchangers arranged on both sides of the emitting electromagnetic ultrasonic energy exchanger. A plurality of emitting energy exchanger units are arranged into an annular set, and orderly generate inclined guiding waves so as to cover the entire circumference of the pipeline wall according to time, and the positions and the sizes of the crack defects are fixed according to the received guiding wave signals and the arranging condition of the energy exchangers. The invention realizes the non-contact purpose of the cracks in the natural gas pipeline without liquid coupling check, and can be used for the crack defects of each direction.

Description

technical field [0001] The invention relates to a method for detecting crack defects in any direction in the pipeline wall by using an electromagnetic ultrasonic transducer to generate ultrasonic guided waves in the oblique direction of the natural gas pipeline wall, and belongs to the field of non-destructive testing. Background technique [0002] Natural gas pipelines are an important tool for long-distance transmission of natural gas resources. Ensuring the safety and normal operation of these pipelines is crucial to maintaining national energy security and people's normal life. During the long-term operation, due to the influence of various factors, various types of defects including cracks will appear on the pipeline wall of natural gas pipelines. If these defects are allowed to develop, natural gas leakage may occur, not only It will cause huge economic losses, pollute the surrounding environment, and even explode, which seriously threatens human life. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 黄松岭王 珅赵 伟叶朝峰郝宽胜董甲瑞王珅赵伟
Owner TSINGHUA UNIV
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