A moving electrode non-destructive testing device for pipelines applied to electric field fingerprinting

A technology of moving electrodes and electric field fingerprints, which is applied in the field of pipeline non-destructive testing technology equipment, can solve problems such as inability to weld, difficult welding operations, and easy corrosion of welded joints, to achieve convenient positioning and collection, convenient and reasonable settings, and reduce construction costs Effect

Active Publication Date: 2017-08-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Welding has high requirements for welding equipment. According to different pipeline materials and electrode materials, welding equipment requirements are different, welding process parameters are different, and it is difficult to explore one by one; for indoor construction, some pipelines are located in narrow locations, and welding operations are difficult. Even welding is impossible, which greatly limits the application range of the technology; correspondingly, for field construction, it is inconvenient to set up the power supply, and the welding equipment is heavy and cannot be flexibly constructed, which also greatly limits the popularization and use of this technology
These defects have increased the installation cost of the device while bringing a lot of trouble to the on-site construction
[0006] 2. The welding connection method is used to weld the capture electrode and the pipeline to be tested. Although the degree is relatively small, it is a kind of damage to the pipeline to be tested. It is more harmful to thin-walled pipelines and violates the principle of non-destructive testing to a certain extent. in principle
[0007] 3. The technical application direction of the electric field fingerprint method is mainly for the detection of petrochemical and other pipelines. One of the advantages of this technology is that the device does not need to stop production, but welding is easy to generate open flames, which is not suitable for operation in high-risk environments
[0008] 4. Using the welding method cannot guarantee that each welded joint is exactly the same, and the resulting welding contact resistance will be different, and the small resistance difference will obviously affect the collection of micro-voltage signals, which limits the high-precision detection of voltage signals
[0009] 5. The firmness of the welding joint between the capture electrode and the structure to be tested needs to be tested, and at the same time, stress concentration is easily formed at the welding joint, which affects the safety of high-pressure pipelines; at the same time, the welding joint is relatively easy to corrode, and the anti-corrosion requirements are relatively high
[0010] 6. In the prior art, the capture electrodes are arranged in the form of an array, so the number of capture electrodes required is relatively large, and since each capture electrode needs to lead out a power line, the installation cost is relatively high
Each electrode probe needs to be effectively connected to the pipeline to be tested, which requires heavy workload, complicated process and high labor cost
Since each capture electrode needs to export data, the data acquisition line is complicated and confusing, and the requirements for data acquisition equipment are relatively high and the cost is relatively expensive. At the same time, when multi-channel data transmission is performed, the data transmission is easily disturbed, which affects the acquisition accuracy.

Method used

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  • A moving electrode non-destructive testing device for pipelines applied to electric field fingerprinting
  • A moving electrode non-destructive testing device for pipelines applied to electric field fingerprinting
  • A moving electrode non-destructive testing device for pipelines applied to electric field fingerprinting

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Experimental program
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Effect test

Embodiment 2

[0062]The difference between this embodiment and Embodiment 1 lies in that the structures of the collection tank unit 4 and the corresponding reciprocating collection unit 5 are different.

[0063] Such as Figure 8 As shown, in the collection tank unit 4 , the collection tank 11 is replaced by a return type collection tank 27 . The return collection tank 27 is also opened on the base plate 2 . The quantity of return type collection groove 27 and the spacing of adjacent two return type collection grooves 27 are determined by detection scheme; In each return type collection groove 27, a plurality of data collection holes 13 are arranged, the quantity of data collection holes 13 and relative The distance between two adjacent data collection holes 13 is also determined by the detection scheme.

[0064] Return rings 26 are provided at both ends of each return collection tank 27 . The return collection tank 27 extends horizontally to form a horizontal section of the return ring ...

Embodiment 3

[0069] The difference between Embodiment 3 and Embodiment 1 is that in this embodiment, both the reciprocating driving unit 3 and the reciprocating collecting unit 5 are directly fixed on the pipeline 1 to be tested, and the bottom plate 2 is only used for setting the collecting tank unit 4 .

Embodiment 4

[0071] The difference between Embodiment 4 and Embodiment 1 is that in this embodiment, travel switches are arranged at both ends of the collection tank 11, the contacts of the travel switch are connected to the controller, and the controller is connected to the motor for controlling the motor. positive and negative. When the probe bracket 15 moves to a certain end of the collection tank 11, the corresponding travel switch is triggered, and at this time the travel switch outputs a control signal to the controller, and the controller controls the motor to rotate in the opposite direction to push the probe bracket 15 in the opposite direction. movement to realize the reciprocating movement of the probe holder 15.

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Abstract

The invention relates to a mobile electrode type pipeline non-destructive testing device applied to the electric field fingerprint method, which belongs to the field of pipeline non-destructive testing technical equipment. Including the pipeline to be tested (1), a region to be tested is set on the pipeline to be tested (1), and a number of detection points are arranged in the region to be tested, characterized in that: the surface of the pipeline to be tested (1) is The non-welded form is provided with a collection tank unit (4) that exposes the detection point, and a reciprocating collection unit (5) is erected on the surface of the collection tank unit (4), and the reciprocating collection unit (5) and the reciprocating drive unit ( 3) Connect and be driven by it to reciprocate along the collection tank unit (4) and complete the collection of detection point data. When the mobile electrode non-destructive testing device for pipelines applied to the electric field fingerprint method of the present invention uses the electric field fingerprint method to test pipeline corrosion conditions, it adopts a non-welding method to realize data collection and avoid a large number of wiring.

Description

technical field [0001] The invention relates to a mobile electrode type pipeline non-destructive testing device applied to the electric field fingerprint method, which belongs to the field of pipeline non-destructive testing technical equipment. Background technique [0002] At present, the resistance probe method and polarization probe method are widely used to monitor the corrosion of pipelines online, but these methods can only detect indirect uniform corrosion, and have damage to the pipe wall. It is helpless to the extremely harmful localized corrosion. Using the electric field fingerprint method to detect pipeline corrosion has the advantages of direct measurement, high accuracy and reliability, strong adaptability, and no damage to the pipeline wall. [0003] The basic principle of the electric field fingerprinting method is: Weld several capture electrodes in the form of an array on the corrosion-prone part of the pipeline to be tested. After the capture electrodes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/61F17D5/06
Inventor 蒋文春王宜金张兰陈健飞王炳英涂善东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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