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A Pipeline Stress Internal Detection Method Based on Complex Stress State Model

A technology of complex stress and state models, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the complicated stress on the pipe wall, limit the application of magnetic field weakening method, and fail to meet the detection signal recognition Requirements and other issues to achieve the effect of judgment detection

Active Publication Date: 2022-07-15
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

However, under the internal load of the pipeline, the stress on the pipe wall is complex, and the existing theoretical models cannot meet the requirements of the internal stress detection signal identification of in-service oil and gas pipelines, which limits the application of the magnetic field weakening method in the field of pipeline detection technology

Method used

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  • A Pipeline Stress Internal Detection Method Based on Complex Stress State Model
  • A Pipeline Stress Internal Detection Method Based on Complex Stress State Model
  • A Pipeline Stress Internal Detection Method Based on Complex Stress State Model

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Embodiment Construction

[0087] A pipeline stress internal detection method based on a complex stress state model, the method steps are as follows:

[0088] The first step: use the detection equipment probe to collect the weak magnetic signal; (the real-time magnetic field signal on the surface of the pipeline is collected)

[0089] Step 2: Input the signal collected in the first step into the constructed complex stress state model to obtain the change of pipeline stress;

[0090] The third step: identify the pipeline stress concentration area according to the pipeline stress change in the second step.

[0091] The complex stress state model of the second step is:

[0092]

[0093] The method for constructing the complex stress state model is as follows: Suppose the entire system is subjected to the combined action of the external magnetic field H and the stress σ, and the effect of the stress on the magnetization of the system is equivalent to an external magnetic field H. σ , represented by the...

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Abstract

A pipeline stress internal detection method based on a complex stress state model, the method steps are as follows: the first step: use the detection device probe to collect the weak magnetic signal; the second step: input the signal collected in the first step into the constructed complex stress state model, and obtain the pipeline stress change; the third step: identify the pipeline stress concentration area according to the pipeline stress change in the second step. The invention adopts a complex stress state model, establishes a magnetic coupling mathematical model, provides a stress detection quantitative algorithm under complex stress state, and realizes the determination and detection of the stress concentration degree of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of internal stress detection of long-distance oil and gas pipelines, and in particular relates to a pipeline internal stress detection method based on a complex stress state model. Background technique [0002] Long-distance oil and gas pipelines work under external loads for a long time. Even if the maximum working stress of the pipeline is lower than the strength limit or even lower than the yield limit, serious accidents such as leakage and pipe explosion may occur suddenly without obvious plastic deformation. Conventional non-destructive testing techniques such as magnetic particle, magnetic flux leakage, eddy current and ultrasonic have played an important role in metal defect monitoring and accident prevention. However, the application of these methods in the field of pipeline stress detection has certain limitations and cannot be predicted. Early damage to the material. [0003] As a new type of non-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/06G01N27/72
CPCG01N3/08G01N3/06G01N27/72G01N2203/0635G01N2203/0676
Inventor 刘斌郑思檬何璐瑶任建
Owner SHENYANG POLYTECHNIC UNIV
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