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Method for detecting underground steel pipe corrosion condition by ground artificial magnetization

An underground steel and artificial technology, applied in geophysical surveying, electromagnetic measuring devices, electric/magnetic exploration, etc., to achieve the effects of low equipment prices, wide range of applicable pipe diameters, and simple methods

Inactive Publication Date: 2011-05-18
刘崧 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, many testing units in China can only use the ultrasonic method to measure the corrosion status of suspected corroded steel pipes on the basis of anti-corrosion layer detection and steel pipe corrosion environment assessment. steel pipe for measurement

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  • Method for detecting underground steel pipe corrosion condition by ground artificial magnetization
  • Method for detecting underground steel pipe corrosion condition by ground artificial magnetization
  • Method for detecting underground steel pipe corrosion condition by ground artificial magnetization

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Embodiment Construction

[0026] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

[0027] Basic principle of the present invention: the material basis of the artificial magnetization method to detect the corrosion status of underground steel pipes (or steel pipes) is that the steel pipes have extremely strong magnetism, and the magnetism is lost after being corroded. When an artificial magnetic field is applied to the steel pipe, the uncorroded part of the steel pipe will generate a magnetic field in the surrounding space under its magnetization, and its strength and distribution depend on the strength of the artificial magnetic field and the distribution of the uncorroded part of the steel pipe in the artificial magnetic field. It is closely related to the distribution of the corroded part in the artificial magnetic f...

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Abstract

The invention relates to a method for detecting the corrosion condition of an underground steel pipe. The method for detecting the corrosion condition of the underground steel pipe by ground artificial magnetization is characterized by comprising the following steps: (1) a reference point is chosen at the ground of a site without the magnetic field influence of steel objects, a magnetometer is adopted to respectively measure a magnetic field vertical component value when a magnetic field emission device provides power supply (the magnetic field emission device emits magnetic fields to the surrounding space) and a magnetic field vertical component value when the magnetic field emission device does not provide power supply, and an artificial magnetic field vertical component value of the reference point is obtained based on the difference of the two values; (2) the measurement same as that in the step 1 is performed on a measurement point arranged on the ground above the underground steel pipe to obtain an artificial magnetic field vertical component value of the measurement point; (3) the artificial magnetic field vertical component value of the measurement point is subtract from the artificial magnetic field vertical component value of the reference point to obtain a magnetic field vertical component value generated at the measurement point under the artificial magnetic field magnetization of the underground steel pipe; and (4) that whether the underground steel pipe is corroded and the corrosion degree are determined according to the size of the magnetic field vertical component values of various measurement points; the smaller the magnetic field numerical value is, the more severe the corrosion is. The method has the advantages of low cost and wide scope of applicable pipe diameters, and can effectively detect the corrosion condition of the underground steel pipes.

Description

technical field [0001] The invention relates to a detection method for corrosion status of underground steel pipelines. Background technique [0002] Pipeline transportation is one of the five major transportation industries in my country. It is widely used in oil and gas, chemical industry, water supply and heating industries, and plays an extremely important role in the national economy. Steel pipes are commonly used for pipeline transportation. The steel pipeline buried in the ground is buried underground all the year round, and various factors such as the surrounding environment and the fluid in the pipeline will cause corrosion of the pipeline. Steel pipelines transporting flammable and explosive fluids such as oil, natural gas, and gas often have accidents such as running, leaking, and leaking due to corrosion and perforation, which not only affects the normal production work, but also pollutes the environment, and even causes explosions and fires , causing heavy los...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10G01B7/06G01N27/82
Inventor 刘崧李国华
Owner 刘崧
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