Quantitative detection method for local corrosion of metal pipeline

A quantitative detection method and local corrosion technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of large detection errors, uncertainty of local corrosion distribution of pipelines, and complex local corrosion of pipelines.

Inactive Publication Date: 2013-05-01
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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Problems solved by technology

This type of instrument receives the pulse signal reflected by the bottom surface of the workpiece with a lower limit value that can be recognized by the instrument. It has a good detection effect on the uniform corrosion area of ​​the plane and the pitting (localized corrosion) area ≥ φ3mm, and the pitting co

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Embodiment Construction

[0025] A quantitative detection method for localized corrosion of metal pipelines, comprising the following steps:

[0026] (1) Rapid corrosion detection of pipelines using ultrasonic guided waves:

[0027] A. Ultrasonic guide wavelength distance detection is 100% detection within the effective range, while conventional thickness measurement is point detection, and the detection coverage is very different.

[0028] B. Ultrasonic guided wave detection of metal loss on the cross section of the pipe is very sensitive.

[0029] C. Limitations of ultrasonic guided wave testing: Guided wave testing is approximate for defect quantification. The parts suspected of local corrosion need to be confirmed by other detection methods.

[0030] Therefore, for the corrosion detection of pipelines, ultrasonic guided waves should be used to scan 100% of the pipe body within the detectable range, and the parts suspected of localized corrosion should be marked.

[0031] (2) Quantitative detecti...

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Abstract

The invention relates to detection of corrosion of a metal pipeline and especially to a detection method for local corrosion of a metal pipeline. The quantitative detection method comprises the following steps: step 1, carrying out rapid corrosion detection on the pipeline by using ultrasonic guided waves and marking positions with suspected local corrosion; step 2, carrying out quantitative detection on the suspected local corrosion of the pipeline by using ultrasonic C-scan techniques; and step 3, calculating maximum local corrosion depth X that is equal to alpha[ln(ln(1/F(x)))]+lambda by using a probabilistic method based on detection results in step 1 and step 2, wherein X is the depth of a corrosion pit, F(x) represents probability that the depth of the corrosion pit is less than or equal to X, alpha is a statistical parameter (a dimension parameter) and lambda is also a statistical parameter (a position parameter). With the method provided by the invention, effective detection and quantification (actual measurement and statistic) of local corrosion of the metal pipeline are realized, so reliable bases are provided for monitoring of corrosion of the pipeline and evaluation of a corrosion residual life of the pipeline.

Description

technical field [0001] The invention relates to corrosion detection of metal pipelines, in particular to a detection method for localized corrosion of metal pipelines. Background technique [0002] As a kind of energy transmission equipment, pipeline is widely used in industrial and agricultural production and people's life. According to incomplete statistics, there are currently more than 2 million kilometers of pipelines in operation in the world. As the service life of pipelines increases, the unsafe factors of pipelines caused by corrosion of pipe bodies and other reasons also increase. During the period from 1965 to 1975, Accidents caused by corrosion of gas pipelines in the United States accounted for 38% of the total number of pipeline accidents, and Western Europe accounted for about 36% of the total number of accidents. [0003] It is generally believed that pipelines will enter a high incidence period after 15 to 20 years of operation, and pipelines need to be rep...

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Application Information

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IPC IPC(8): G01N29/04
Inventor 顾素兰何磊李达
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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