Device and method for reducing temperature error of test adopting electric field fingerprint method

Abstract

The invention discloses a device and a method for reducing a temperature error of a test adopting an electric field fingerprint method, and belongs to the technical field of non-destructive tests for pipelines. The device comprises a pipeline (1) to be tested and a reference plate, and is characterized in that a running compensation device (2) is arranged on the surface of the pipeline (1) to be tested, and the reference plate is fixed on the surface of the running compensation device (2); and a medium circulation unit and a temperature compensation unit are arranged on the running compensation device (2). The method comprises a data acquisition process of signal acquisition for capture electrodes on the pipeline (1) to be tested, and the reference plate, and a data analysis and processing process after the data acquisition, during running of the medium circulation unit and the temperature compensation unit. According to the device and the method for reducing the temperature error of the test adopting the electric field fingerprint method, influence of a temperature on the pipeline to be tested, is completely embodied through the reference plate, thus the corrosion condition of the pipeline to be tested is accurately judged through the electric field fingerprint method.

Description

technical field [0001] The invention relates to a device and a method for reducing the temperature error of the electric field fingerprint method, which belong to the technical field of pipeline non-destructive testing. Background technique [0002] In the prior art, pipeline corrosion is the main cause of accidents in the field of oil transportation, and its specific forms can be divided into: uniform corrosion, localized corrosion, pitting corrosion, weld corrosion and erosion, etc. 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 can't do anything about the extremely harmful localized corrosion. [0003] Compared with the existing technology, using the electric field fingerprint method to measure pipeline corrosion theoretically has the advantages of direct measurement, high accuracy and reli...

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Problems solved by technology

[0005] However, in the actual measurement, it was found that the reference plate originally introduced to eliminate the temperature effect did not achieve the ideal state, mainly because the temperature of the pipeline to be tested and the reference plate were not synchronized. The specific performance is as follows: On the one hand, there is a certain temperature difference between the temperature of the inner wall of the pipeline to be measured and the actual temperature of the reference plate; on the other hand, when the internal temperature of the pipeline changes, the temperature of the reference plate cannot respond in time

Due to the temperature asynchronous situation, in actual use, the voltage value change of the capture electrode on the reference board cannot fully reflect the influence of temperature on the current, so the measurement results obtained in this state will be affected. The corrosion monitoring results of pipelines or tanks have a great influence, so the reference plate not only cannot play the expected reference role, but even affects the normal judgment of the corrosion situation in the pipeline to be tested

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