Corrosion morphology quantitative detection method of outer wall of pipeline

A quantitative detection method, a technology for the outer wall of a pipeline, which is applied in measurement devices, optical testing flaws/defects, instruments, etc., can solve the problems of high detection cost, small measurement range, low measurement accuracy, etc., and achieves strong anti-interference ability and measurement range. The effect of large, high measurement accuracy

A quantitative detection method, a technology for the outer wall of a pipeline, which is applied in measurement devices, optical testing flaws/defects, instruments, etc., can solve the problems of high detection cost, small measurement range, low measurement accuracy, etc., and achieves strong anti-interference ability and measurement range. The effect of large, high measurement accuracy

CN105486240AActive Publication Date: 2016-04-13PETROCHINA CO LTD
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  • Corrosion morphology quantitative detection method of outer wall of pipeline
  • Corrosion morphology quantitative detection method of outer wall of pipeline
  • Corrosion morphology quantitative detection method of outer wall of pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a method for quantitative detection of corrosion appearance on the outer wall of a pipeline, which includes the following steps:

[0027] Step 1) Collect point clouds on the surface of the corroded pipeline;

[0028] Step 2) reversely restore the collected point cloud to a 3D solid image of the pipeline;

[0029] Step 3) Analyze the three-dimensional solid image of the pipe surface, take the inner wall as the reference plane, and the outer wall as the test object to obtain the actual pipe wall thickness in different areas, and use different colors to represent different actual pipe wall thicknesses to reflect different areas of the outer wall of the pipe The size of the degree of corrosion.

[0030] After the point cloud is collected, the corrosion pipeline is reversely restored, and the following is obtained: figure 1 The three-dimensional topography of corrosion on the pipeline surface is shown, figure 1 The appearance of the outer wall sho...

Embodiment 2

[0032] On the basis of Example 1, the specific process of point cloud acquisition on the surface of the corroded pipeline is as follows:

[0033] (1) Remove the paint and corrosion products on the outer surface of the pipeline, remove the rust on the surface with a copper brush, and clean the surface of the pipeline with alcohol and acetone, so that the matrix on the surface of the pipeline is completely exposed;

[0034] (2) Apply a layer of white imaging agent evenly on the outer surface of the pipe, then paste at least three marking points on the outer surface, and then use the calibration plate to calibrate;

[0035] (3) Start scanning, and project gratings of various frequencies onto the pipeline of the object to be tested through the grating projector, and two CCD cameras receive a corresponding angled image at the same time, and then decode and phase calculate the image;

[0036] (4) Multi-view and multiple omni-directional scans are performed on the surface of the pipe...

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Abstract

The present invention provides a corrosion morphology quantitative detection method of the outer wall of a pipeline. The method provided by the invention comprises the following steps: 1) point cloud acquisition; 2) three-dimensional entity image reduction; 3) analysis of a three-dimensional entity image at the surface of a pipeline. The method provided by the invention is able to visually reflect the corrosion degrees of different areas of the outer wall, the deviation of the inner surface and the outer surface is highlighted through establishing of marks at special positions, and the quantitative analysis of the variation trend of the corrosion degree at the cross section is realized.

Description

technical field [0001] The invention belongs to the technical field of corrosion detection, and in particular relates to a quantitative detection method for the corrosion appearance of the outer wall of a pipeline. Background technique [0002] In the oil and gas industry, pipeline transportation occupies an important position, which has the characteristics of high efficiency and low transportation cost. The environment in which the pipeline is located often causes corrosion on the surface of the pipeline due to many factors (such as acidic gas, etc.), resulting in pits or even perforations on the surface, which seriously affects the service life of the pipeline, and even accidents occur, which is very harmful. Therefore, the research on the corrosion mechanism of pipelines and the corresponding anti-corrosion measures have become an important research topic in the petrochemical industry, and the analysis of the surface morphology of corroded pipelines is an important part o...

Claims

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Application Information

Patent Timeline
13 Apr 2016
Publication
CN105486240A
IPC
G01B11/06; G01N21/88
CPC
G01B11/06; G01N21/8851; G01N2021/8887
Inventors
解永刚; 田喜军