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.
CN101424663AInactive Publication Date: 2009-05-06TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2009-05-06
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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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