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Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state

A metal pipeline and electrical measurement technology, applied in the fields of corrosion detection, non-destructive testing, and underground pipeline survey, can solve the problems of difficulty in detection and other problems, and achieve the effects of low detection cost, simple working method and low equipment price.

Inactive Publication Date: 2004-03-03
大连康塞谱科技发展有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Secondly, there are some defects and deficiencies in these technologies. For example, the minimum detection depth of the magnetic flux leakage corrosion detector is 20% of the wall thickness. (1.8)mm, will be detected
In addition, from a principle point of view, some in-pipe detection techniques are difficult to detect the uniform corrosion of the material that is relatively uniform and subject to gradual changes.
What's more serious is that these in-pipe detection equipment are only suitable for oil and gas transmission main lines with large pipe diameters, and the detection of small-diameter pipelines below DN-273 (outer diameter of 273mm), which is the first in China both in terms of equipment and technology. blank [1]

Method used

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  • Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state
  • Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state
  • Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state

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Embodiment 1

[0020] In order to study the feasibility of surface broad-spectrum electrical measurement to detect the corrosion condition of underground metal pipelines, we in Wait and Williams [2] On the basis of the deduced theoretical formula, the theoretical formula of the amplitude and phase of the alternating electric field measured by the electrode device arranged on the ground vertical to the direction of the pipeline is deduced when there is an infinitely long metal pipeline installed horizontally underground. [2] Wait, J R and Williams J T. EM and IP response of a steel well casing for a four-electrode surface array. Part I: Theory, Geophysical Prospecting, 1985, 33: 723-735. On this basis, the theoretical spectrum curves of underground metal pipelines with the same outer diameter and different wall thicknesses are calculated when the electrode device is measured.

[0021] The spatial position, coordinates and geophysical parameters of the section of the metal pipeline during cal...

Embodiment 2

[0025] Because in practice, in order to prevent the outer surface of underground steel oil and gas pipelines from being corroded, the outside is covered with a high-resistance anti-corrosion layer. For such underground metal pipelines, the above-mentioned method of theoretical calculation and inversion to understand the corrosion status is not applicable. of. To this end, we wrapped three 20-gauge steel seamless steel pipes with a length of 10.3m, an outer diameter of 325mm, and wall thicknesses of 15mm, 10mm, and 8mm, and then buried them in three different locations underground (so that they would not Interaction), constructed three physical models, the central buried depth is 1m. On the measuring line arranged vertically through the center of the steel pipe, the power supply electrode AB is located on the left of point O, AB=5m, BO=5m; the measuring electrode is located on the right of point O, OM=1m, MN=1m, used for mineral exploration Measurements were carried out using ...

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Abstract

An electric measuring method for detecting the corrosive state of underground metallic pipeline on the ground includes such steps as arranging the power-supplying electrodes A and B and measuring electrodes M and N along the measuring line perpendicular to the direction of underground pipeline, connecting A and B to AC power supply, connecting M and N to broad-spectrum electric measuring instrument, continuously changing the frequency of said measuring instrument while measuring the ampletudes and phases of AC potential difference, drawing the spectral curves of said ampletude and phase, and determining the corrosion level according to the exception value on spectral phase curve. The smaller the exception value, the more serious the corrosion.

Description

technical field [0001] The invention relates to methods for underground pipeline survey, corrosion detection and non-destructive detection. 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. Metal pipes buried in the ground are buried underground all year round, and various factors such as the surrounding environment and the fluid in the pipe will cause corrosion of the pipe. Pipelines transporting flammable and explosive fluids such as oil, natural gas, and gas often suffer from corrosion and perforation, and accidents such as running, leaking, and leaking often occur, which not only affect the normal production work, but also pollute the environment, and even cause explosions and fires. and people's property and life caused heavy losses. Therefore, it i...

Claims

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Application Information

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IPC IPC(8): G01N27/00G01N27/416
Inventor 刘崧李国华孟永良
Owner 大连康塞谱科技发展有限公司
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