Method of detecting corrosion state of metal pipe line through insulating layer/cladding layer

A metal pipe and cladding technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as economic loss, difficulty in online detection of pipelines, and waste of manpower and materials for the insulation layer, and achieve The effect of high detection speed, easy automation and online detection, and strong ability to resist stray magnetic field interference

Inactive Publication Date: 2006-01-11
林俊明
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] There are various methods for detecting the corrosion of metal pipelines, such as ultrasonic method, magnetic flux leakage method, eddy current method, etc. When detecting the corrosion of metal pipelines with insulation layers, due to the general The temperature is high, which brings certain difficulties for the probe to enter the pipeline for online detection. The usual method is to peel off the insulation layer and then test the pipeline in the state of shutdown. This detection method not only increases the temperature of the insulation layer The resulting waste of manpower and materials will cause economic losses due to production stoppage.

Method used

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Examples

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Embodiment 1

[0021] Embodiment 1, a method for detecting the corrosion status of metal pipelines through the insulation layer / coating layer of the present invention is applied to the detection of corrosion status of metal pipelines with insulation layers, including two processes of calibration and actual measurement:

[0022] In the calibration process, it includes the following steps:

[0023] a. Establish a metal pipe model with an insulation layer, and set the insulation layer thickness, metal pipe diameter, and metal pipe wall thickness of the metal pipe model as parameters;

[0024] b. Select the thickness of the insulation layer as the first parameter, and use the eddy current sensor to detect close to the surface of the metal pipeline model with the insulation layer. The eddy current sensor is excited by a preset signal sent by the arbitrary waveform generator, and the signal sent by the arbitrary waveform generator It is preferable that the pulsed eddy current alternates with a lim...

Embodiment 2

[0032] Embodiment 2, a method of the present invention for detecting the corrosion status of metal pipelines through the insulation layer / coating layer is applied to the detection of the corrosion status of metal pipelines with insulation layers, including two processes of calibration and actual measurement, and implementation The difference of Example 1 is that in the calibration process, it uses the wall thickness of the metal pipe as the first parameter, the thickness of the insulation layer as the second parameter, and the diameter of the metal pipe as the third parameter for simulation calibration.

Embodiment 3

[0033] Embodiment 3, a method of the present invention for detecting the corrosion status of metal pipelines through the insulation layer / coating layer is applied to the detection of the corrosion status of metal pipelines with insulation layers, including two processes of calibration and actual measurement, and implementation The difference of Example 1 is that in the calibration process, it uses the diameter of the metal pipe as the first parameter, the wall thickness of the metal pipe as the second parameter, and the thickness of the insulation layer as the third parameter for simulation calibration.

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Abstract

The present invention discloses a method for detecting metal pipiline corrosion condition by penetrating heat-insulating layer and covering layer. Lt utilizes electromagnetic eddy current thickness-measuring principle and adopts the alternation of pulse eddy current and finite amount of variable-frequence sine waves as signal for exciting eddy current sensor. Said invention also provides the concrete step of said metal pipeline corrosion detection method by using metal pipeline model.

Description

technical field [0001] The invention relates to a method for detecting the corrosion state of metal pipelines, in particular to a method for detecting the corrosion conditions of metal pipelines through the insulation layer / coating layer. Background technique [0002] Pipelines are an important means of transportation through which people can transport oil, gas, water and other substances. For example, my country's key project of West-East Gas Transmission uses pipelines to transport natural gas from the west to the east. One of the five major transportation industries in my country, it has been widely used in many industries such as oil and gas, chemical industry, water supply and heating, and plays a pivotal role in the national economy. While pipelines provide people with convenient transportation, there are also important safety hazards , which is mainly reflected in the fact that after a certain period of use of the pipeline, due to the influence of various factors such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/00
Inventor 林俊明
Owner 林俊明
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