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

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 ...

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.

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