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TEM detecting method for pipe wall thickness and intelligent detector for GBH pipe corrosion

A pipe and pipe wall technology, which is applied in the field of corrosion detection of the average pipe wall thickness of metal pipes, and can solve problems such as strong environmental requirements around the pipe

Active Publication Date: 2009-02-04
BAODING CHICHENGQIANLI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] This method has strong requirements on the surrounding environment of the pipeline. There should be no other metal pipelines within twice the sending and receiving distance. At present, there is no special instrument

Method used

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  • TEM detecting method for pipe wall thickness and intelligent detector for GBH pipe corrosion
  • TEM detecting method for pipe wall thickness and intelligent detector for GBH pipe corrosion
  • TEM detecting method for pipe wall thickness and intelligent detector for GBH pipe corrosion

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Experimental program
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Effect test

Embodiment 1

[0045] In order to illustrate the feasibility of the TEM method for the thickness of the metal pipe wall, the expression of the electromagnetic response of the circular cylinder in the harmonically variable field is firstly derived. like Figure 4 As shown, the outer radius of the circular cylinder is a, the wall thickness is d, the center depth is h, and the electromagnetic parameters in the column and inside the column are respectively σ G , μ G , σ J , μ J .

[0046] When the transmitting loop passes a transient pulse square wave signal, the normalized electromotive force excited in the receiving loop can be expressed by the following mathematical formula:

[0047] U ( t ) I = 8 μ D π ( a ...

Embodiment 2

[0072] In order to better illustrate the actual application effect of the pipeline wall thickness TEM detection method and the GBH pipeline corrosion intelligent detector, the following examples are provided. The ground test pipeline in the joint station of the oil production plant is Φ219×7mm, threaded steel pipe, and the detection section is 20m. Follow the steps below to detect:

[0073] 1) Preparation before detection: According to the site conditions, determine that the distance between the detection points is 1 meter, the size of the sensor is 0.5 meters, and the number of coil turns is 50 turns. Make a mark at the measuring point;

[0074] 2) The sensor is placed horizontally directly above the center of the pipeline, and cables are used to connect the transmitting loop and the transmitting end of the data collector, and the receiving loop and the receiving end of the data collector;

[0075] 3) Turn on the data collector transmitter, receiver, and control computer for...

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Abstract

The present invention relates to a corrosion examination and non-destructive examination method for a metal pipeline. The instant electromagnetic technology (TEM) is used to examine the average thickness of the wall of the pipeline under the condition that no dig is performed, no corrosion-prevention layer is damaged and the normal running of the pipeline is not influenced. The method is characterized in that when other conditions are the same, the metal pipeline with different wall thicknesses can have obvious time divisibility on a normalized pulse instant-changing responding curved line. The wall thickness of the measured section of the pipe can be obtained by the indication of the known wall thickness and the method of inversing modeling. The present invention also relates to a corrosion examination and non-destructive examination systematic device for the metal pipeline. A virtual instrument is designed and produced with the TEM examination method for the wall thickness of the metal pipeline; a data collector adopts the instant-changing electromagnetic instrument; the control of the instruments, the data processing and the results expression are realized by the software of the computer, so that the expansion property of the instrument is strengthened, and the renewing speed is accelerated, and the complicate data processing analysis can be performed instantly. The device can be widely used for examining the corrosion of the anti-corrosion heat-preservation pipeline in the industries such as the petroleum industry, the petrochemical industry, the fuel gas industry, the electric power industry, the water supply industry, and the like.

Description

Technical field: [0001] The invention relates to corrosion detection, non-destructive detection and transient electromagnetic geophysical method technology of the average pipe wall thickness of metal pipelines. Background technique: [0002] The main workflow for testing the wall thickness of buried pipelines at home and abroad is still: excavation—stripping off the anticorrosion (insulation) layer—ultrasonic thickness gauge measurement—coating—backfilling. Obviously, this is a destructive detection method, and the representativeness of detection data and the reliability of evaluation conclusions are affected by the number of excavation (sampling) points and their distribution range. At the same time, the cost of excavation inspection and the damage to the environment are often unacceptable. [0003] Although the in-pipe detection method is relatively intuitive, it not only has strict requirements on the construction conditions of the pipeline, the size of the pipe diameter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06F17D5/00G01N27/82
Inventor 李永年李晓松尚兵
Owner BAODING CHICHENGQIANLI SCI & TECH
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