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

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...

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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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