Health condition diagnosing method for protective layer of buried metal pipeline

A protective layer and pipeline technology, applied in the direction of measuring resistance/reactance/impedance, instruments, measuring devices, etc., can solve problems such as evaluation errors, differences in professional technical skills, and differences in cathodic protection potential, achieve low power consumption, and ensure long-term operation , to ensure the effect of realizability

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

This working method has the following disadvantages: 1) The cathodic protection potential measured by the manual line inspection method is all using a portable copper sulfate reference electrode. Different buried positions and depths, as well as changes in soil moisture content at different times, changes in the potential of the energized point, different measurement times, etc., will cause large differences in the measured cathodic protection potentials, and the measured results are not comparable; 2) It is unscientific to judge whether the buried metal pipeline is protected or not based only on whether the cathodic protection potential on the test pile is lower than -0.85V
In fact, this situation exists: due to the negative potential of the energized point, even if the protective layer falls off between the two te...

Method used

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  • Health condition diagnosing method for protective layer of buried metal pipeline
  • Health condition diagnosing method for protective layer of buried metal pipeline
  • Health condition diagnosing method for protective layer of buried metal pipeline

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Embodiment Construction

[0091] The technical route of the present invention is: install low-power consumption potential acquisition instruments at each test pile along the pipeline, and the potential acquisition instrument detects the cathodic protection potential of each test pile in the pipeline, and transmits the potential value, pipeline information, and stake number through the GPRS wireless transmission module Monitor the computer and store it in the database. The monitoring software evaluates the health status of the protective layer of each section of the pipeline according to the cathodic protection potential on each test pile and its distance from the energized point, and according to the difference between the two potential measurement results (potential drop value) before and after each test pile Whether the maximum value is greater than the threshold determines whether to issue a safety warning for the pipeline section and realize the location of the pipeline defect.

[0092] refer to ...

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Abstract

The invention relates to a health condition diagnosing, prewarning and defect locating method for a protective layer of a buried metal pipeline, comprising a precise measuring method for the cathode protection potential of the buried metal pipeline, a reliable assessment method for horizontal insulation resistance of the protective layer with unit length, a safety prewarning and defect locating method for the protective layer and a realizing method for the micro power consumption measurement of a meter. The invention provides a quality evaluating method for the protective layer of the buried metal pipeline.

Description

[0001] This application is a divisional application with the application number 201010189494.4 and the name of the invention: the health status diagnosis, early warning and defect location method of the protective layer of buried metal pipelines. technical field [0002] The invention relates to the field of detection, diagnosis and early warning of the health status of the protective layer of buried metal pipelines. Background technique [0003] The health diagnosis technology of the protective layer of buried metal pipelines is of great significance to the safe operation of metal pipelines. Over the years, anti-corrosion workers in various countries have studied many methods and technologies for detecting defects in the protective layer of metal pipelines, mainly inputting DC signals or AC signals to pipelines. Electrical signals are realized by detecting changes in potential, current or magnetic field strength along the pipeline. Commonly used techniques include pipe-to-gr...

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Application Information

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IPC IPC(8): G01R19/25G01R27/02G01R31/00G01R19/165G08C17/02
Inventor 林伟国郑志受
Owner BEIJING UNIV OF CHEM TECH
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