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Complete-coverage transient electromagnetic detection method for continuously diagnosing corrosion and defects of pipe body metal

A transient electromagnetic and metal corrosion technology, applied in the direction of material magnetic variables, etc.

Active Publication Date: 2013-07-10
BAODING CHICHENGQIANLI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a full-coverage transient electromagnetic detection method for continuous diagnosis of pipe metal corrosion and defects, using a continuous mobile transient electromagnetic response signal acquisition and analysis technology to solve the problem of covering the entire inspected pipe section and detecting Metal corrosion and all-round pipe body defects such as pipe making, machinery, welding, stress deformation, etc., especially to solve the integrity evaluation of underground pipelines to cover the entire inspected section, detect metal corrosion and pipe making, machinery, welding, All-round pipe body defects such as stress and deformation to meet the needs of actual conditions

Method used

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  • Complete-coverage transient electromagnetic detection method for continuously diagnosing corrosion and defects of pipe body metal
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  • Complete-coverage transient electromagnetic detection method for continuously diagnosing corrosion and defects of pipe body metal

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Embodiment 1

[0076] A full-coverage transient electromagnetic detection method for continuously diagnosing pipe body metal corrosion and defects, comprising the following steps:

[0077] The first step is to carry out continuous mobile data acquisition of transient electromagnetic response signals;

[0078] In the second step, during data analysis and processing, not only the attenuation law of single-point data is studied, but also the abnormal changes between adjacent data are studied;

[0079] The third step is to calculate the anomaly index and perform classification evaluation.

Embodiment 2

[0081] The full-coverage transient electromagnetic detection method for continuous diagnosis of pipe body metal corrosion and defects is the same as that in Embodiment 1, the difference is that

[0082] In the first step, the sensor is moved along the axis of the pipeline directly above the pipeline to be detected, and at the same time, the transmitter is started to send out bipolar excitation square waves; The decay curve of the secondary magnetic field, that is, the transient response curve; the curve indicates that the magnetic flux of the secondary magnetic field passing through the receiving loop of the sensor changes with time, so that the induced electromotive force generated by the excitation in the receiving loop continues until a section of pipeline detection Finish;

[0083] In the second step, during data analysis and processing, take the distance as the abscissa and the transient response value at the same time as the ordinate to make a profile graph;

[0084] In...

Embodiment 3

[0086] like figure 2 As shown, the full-coverage transient electromagnetic detection method for continuous diagnosis of pipe metal corrosion and defects is the same as that in Embodiment 2, except that the sensor is a transmitting-receiving loop assembly.

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Abstract

The invention relates to a complete-coverage transient electromagnetic detection method for continuously diagnosing corrosion and defects of pipe body metal. The method comprises the following steps of: performing a collection and analysis technology on a continuously-movable type transient electromagnetic response signal; calculating attribute abnormal indexes by utilizing a signal fluctuation range value through carrying out analysis treatment on a detection signal to reflect that states of pipeline burying depths, pipeline specifications, welding and the like are abnormal; calculating defect abnormal indexes by utilizing an attenuation comprehensive parameter value to reflect that the defects of pipe defects, corrosion, stress concentration and the like are abnormal; classifying pipe attribute abnormal indexes and pipe defect abnormal indexes so as to effectively detect the magnetic conductivity and the conductivity of a pipeline and carry out high-precision detection on the defects of a pipe body with the variation; and setting a risk threshold value to enhance intensive monitoring on a high-risk section; setting a welding mark threshold value and screening a suspected welding mark and the like; and covering a whole detection section aiming at integrity evaluation of an underground pipeline, and carrying out full-direction coverage detection on the corrosion and the defects of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of non-excavation, non-destructive continuous non-destructive detection of pipe body metal corrosion and defects, in particular to a full-coverage detection method for continuous diagnosis of pipe body metal corrosion and defects, in particular to a continuously moving instantaneous Acquisition and analysis technology method of variable electromagnetic response signal. Background technique [0002] At present, most of the ground detection methods used in pipeline integrity evaluation are aimed at the performance of pipeline anticorrosion layer and the operation status of cathodic protection system, while the ground detection methods for pipeline metal corrosion and defects are very limited. [0003] The existing "NOPIG" technology (N.P.Inspection.Serviccs.GmbH applies the frequency domain electromagnetic method) is based on the frequency domain electromagnetic principle, using the relative offset of the equi...

Claims

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Application Information

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