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Non-contact pipeline magnetic detection method

A non-contact, magnetic detection technology, used in pipeline systems, material magnetic variables, mechanical equipment, etc., can solve the problems of expensive internal detection equipment and cumbersome process, and achieve easy on-site implementation, simplified detection process, and missed detection rate. reduced effect

Active Publication Date: 2013-05-01
SICHUAN HUIZHENG PIPELINE TECH
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Problems solved by technology

This method mainly uses internal detection, and the use of internal detection equipment is expensive, the process is cumbersome, and it is required to be close to the surface of the object to be detected, which requires pre-excavation of pipelines. Because the pipeline conditions do not have the possibility of a large number of blind excavations, its size is limited. promotion of scale

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Embodiment Construction

[0028] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0029]Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0030] The non-contact pipeline magnetic detection method of the present invention comprises the following steps:

[0031] Step 1. Preliminary analysis to determine the construction period: Check and analyze the pipeline design, pipeline operation and operation documents in the area to be tested, and preliminarily judge the location of possible pipeline defects according to the characteristics of the pipeline, sort out the pipeline sections th...

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Abstract

The invention discloses a non-contact pipeline magnetic detection method which relates to a damage detection technology of petroleum and natural gas buried metal pipelines. The non-contact pipeline magnetic detection method comprises the following steps that (1) initial analysis is conducted and the construction period is determined; (2) the ground is cleared and a route is marked; (3) a pipeline is detected; (4) detection data is analyzed and processed; and (5) a data result is processed. According to the non-contact pipeline magnetic detection method, the defects of an existing contact method for detecting the local defects of the pipeline, such as a complicated process in which blind excavation is carried out, the pipeline is cleared and demagnetized, and finally the pipeline is uniformly magnetized, are overcome; and the pipeline is uniformly magnetized by the earth magnetic field, on-line detection can be carried out on the surface of a work piece without clearing the surface of the detected work piece or pre-treating the surface of the detected work piece in other ways, so that the detection process is greatly simplified, the speed is high, the efficiency is high, and the detection depth is greatly increased.

Description

technical field [0001] The invention relates to a damage detection technology for buried metal pipelines of petroleum and natural gas, in particular to a non-contact damage detection method for pipelines using a non-contact magnetic tomography technology. Background technique [0002] At present, the method of contact detection of local defects in pipelines is to use professional detection equipment-internal inspection flaw detectors to record the magnetic field stress defects of pre-magnetized pipelines. The method includes cleaning equipment and flaw detectors, flushing and cleaning the inside of the pipeline and ensuring the complete smoothness of the section, allowing the flaw detector to pass through while magnetizing the pipe wall, recording and storing magnetic field anomalies according to the dispersed and saturated magnetic fields, and interpreting the obtained information In order to determine the location and characteristics of the found abnormalities, according t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02G01N27/82
Inventor 侯曲波胡祥云廖柯熹余杰
Owner SICHUAN HUIZHENG PIPELINE TECH
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