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Method for detecting corrosion of submarine pipelines

A technology for submarine pipelines and pipelines, which is applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., and can solve problems affecting submarine pipeline transportation and lack of detection methods

Inactive Publication Date: 2017-11-07
WENZHOU POLYTECHNIC
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  • Abstract
  • Description
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Problems solved by technology

The lack of external corrosion detection methods for submarine pipelines has become a technical barrier affecting the transportation of submarine pipelines

Method used

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  • Method for detecting corrosion of submarine pipelines
  • Method for detecting corrosion of submarine pipelines
  • Method for detecting corrosion of submarine pipelines

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Embodiment Construction

[0026] The above and other technical features and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments.

[0027] refer to figure 1 , This embodiment provides a method for detecting corrosion of a submarine pipeline, which includes a step S100 of acquiring an AC impedance, a step S200 of acquiring a detection frequency, and a step S300 of determining the condition of the pipeline.

[0028] In step S100, an AC disturbance signal is loaded at one end of the pipeline, an AC response signal generated according to the corrosion state of the pipeline is received at the other end of the pipeline, and the AC impedance of the pipeline is obtained according to the AC disturbance signal and the AC response signal. In fact, when testing, the first thing that needs to be determined is the AC impedance of t...

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Abstract

The invention discloses a method for detecting corrosion of submarine pipelines. The method comprises the following steps of: acquiring alternating-current impedance, acquiring detection frequency and determining pipeline conditions. The detailed steps are as follows: loading alternating-current disturbance signals to one end of a pipeline, receiving alternating-current response signal generated according to the corrosion state of the pipeline at the other end of the pipeline, and acquiring alternating-current impedance according to the alternating-current disturbance signals and the alternating-current response signals; changing the frequency of the alternating-current disturbance signals loaded on the pipeline, acquiring the alternating-current impedance of the pipeline under different frequencies and selecting maximum value and minimum value and corresponding maximum detection frequency and minimum detection frequency; and respectively loading current signals with maximum detection frequency and minimum detection frequency to one end of the pipeline, receiving the current signals at the other end of the pipeline, extracting electrochemical noise from the current signals and carrying out fourier transformation and maximum-entropy-method transformation on the electrochemical noise to obtain characteristic parameters of a power density spectrum.

Description

technical field [0001] The invention relates to the field of detection of an outer corrosion layer of a submarine pipeline, cathodic protection state and signal processing, and more particularly to a method for detecting corrosion of a submarine pipeline. Background technique [0002] The pipeline transportation of oil and natural gas has the characteristics of less investment in the transportation process, short transportation period, large transportation volume and high efficiency, which makes it known as the "energy bloodline". It has very obvious advantages in the five major transportation industries and plays an important role in economic development. important role. However, the frequent occurrence of safety accidents caused by the damage of submarine pipelines not only destroys the ecological environment, but also causes incalculable losses to the national economy, and also endangers the safety of people's lives. Therefore, all sectors of society are paying more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02G01N17/02
CPCG01N17/02G01N27/02
Inventor 胡文飞国强
Owner WENZHOU POLYTECHNIC
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