Metal pipeline corrosion detection technology based on multi-frequency AC field fingerprint method based on phase recognition

A metal pipe and phase recognition technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of being susceptible to drift interference, unable to measure the absolute defect depth, etc., and achieve the effect of avoiding adverse effects

Active Publication Date: 2020-03-24
SICHUAN UNIV
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Problems solved by technology

[0016] The present invention is mainly aimed at the disadvantages that the current traditional DC field fingerprint technology cannot measure the absolute defect depth, needs to introduce a reference voltage to cause drift interference, and the temperature difference between the reference plate and the measured pipeline will introduce a large measurement error, etc., and proposes A Multi-Frequency AC Field Fingerprint Metal Pipeline Defect Detection Technology

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  • Metal pipeline corrosion detection technology based on multi-frequency AC field fingerprint method based on phase recognition
  • Metal pipeline corrosion detection technology based on multi-frequency AC field fingerprint method based on phase recognition
  • Metal pipeline corrosion detection technology based on multi-frequency AC field fingerprint method based on phase recognition

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Embodiment Construction

[0029] An implementation example of the present invention is described in detail as follows:

[0030] The present invention is a metal pipeline defect detection technology of the multi-frequency AC field fingerprint method, and the specific implementation steps are as follows:

[0031] (1) Select an ordinary carbon steel pipe with a wall thickness of 10mm, a pipe diameter of 219mm, and a length of 1000mm as the measured object, weld a pair of current excitation electrodes at both ends of the pipe, and weld and install the measuring electrode matrix on the outer wall of the pipe center, The distance between electrodes measured in the axial direction is 35mm;

[0032] (2) Process defects with a depth of 1mm, 2mm, 3mm, 4mm, 5mm and 6mm on the inner wall of the pipeline corresponding to the measuring electrode, and the size of the defect is 35mm×35mm;

[0033] (3) According to the material characteristics of the pipeline under test, adjust the frequency of the excitation current,...

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Abstract

A multi-frequency alternating current field fingerprinting metal pipe corrosion detecting technology based on phase recognition comprises the following steps: applying excitation alternating current of which the frequency is from high to low to a measured pipe; enabling the current to gradually permeate from the outer wall of the pipe to the inner wall of the pipe under the action of the skin effect, wherein the amplitude and phase of a measured signal can be changed by existing of defects; and selecting the maximum phase angle of a series of voltage signals to solve the defect depth. The absolute defect depth can be measured, reference voltage, original voltage and original wall thickness do not need to be measured, the drift resistance is good, and the technology is suitable for long-time online monitoring.

Description

technical field [0001] The field that the present invention relates to is mainly oil and gas metal pipeline defect detection and on-line monitoring, and specifically relates to a kind of oil and gas metal pipeline defect depth detection and on-line monitoring technology. The specific technical scheme is: at both ends of the area to be tested of the metal pipeline to be tested, two current injection electrodes are fixedly installed at a certain distance, so that the current distribution in the area to be tested in the pipeline is distributed as evenly as possible; The measuring electrodes are fixedly installed, and two adjacent electrodes along the pipeline axis form a measuring electrode pair; the metal area of ​​the pipeline between the electrode pairs can be equivalent to a resistance, so under the action of the excitation current, the electrode pair will Generate a voltage; inject a set of AC excitation currents with frequencies from high to low into the metal pipeline unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 甘芳吉谭星廖俊必
Owner SICHUAN UNIV
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