Pipeline corrosion detection method
A corrosion detection and pipeline technology, which is applied in the processing of detection response signals, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, instruments, etc., can solve the problems of insufficient accuracy and influence of thickness values, and achieve high accuracy and speed. Effect
Active Publication Date: 2018-04-20
NANTONG INST OF TECH
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Ultrasonic thickness measurement usually adopts interface primary echo method or echo-echo method. Both methods use setting threshold and obtain the first echo higher than the threshold as the comparison position. influences
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[0027] Below in conjunction with specific embodiment, content of the present invention is described in further detail:
[0028] In order to achieve the purpose of the present invention:
[0029] B-scan: It is to display the ultrasonic signal in a certain section in the form of grayscale in a two-dimensional plane. The abscissa represents the displacement direction of the scanning mechanism, and the ordinate represents the depth direction of ultrasonic propagation.
[0030] The detection object is a high-pressure natural gas storage well, and the state stipulates that its working status needs to be determined regularly, and the corrosion degree of its pipe wall needs to be detected. The wall thickness of the gas storage well is between 11-13 mm, and the depth is up to 300 meters, usually between 150-200 meters. There are about 4-8 wells in a gas filling station, and it is generally required to complete two inspections for one well within one hour. , requiring detection of 2000...
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Abstract
The invention discloses a pipeline corrosion detection method. The method comprises the following steps: 1, performing initialization, setting an initial value, establishing a corrosion color code, and determining the sampling time window and the sensitivity; 2, sampling and recording ultrasonic radiofrequency echoes at different positions in the circumference of a pipeline; 3, calculating the thickness through using a fast correlation algorithm; 4, unfolding the wall of the pipeline to form a plane graph, and marking different points with colors in the corresponding color code according to the corresponding measured thickness to generate a corrosion cloud map; and 5, judging internal and external corrosion according to B scanning straightening, wherein a distance between a detector and the surface of a workpiece continuously changes in the detection process, all echo lines in the obtained B scanning spectrum are not linear, and the straightening operation is carried out with a presetecho as a datum line to display the display positions of other echoes in the B scanning spectrum. The thickness is calculated through the fast correlation algorithm to generate the corrosion cloud map, so the method is suitable for the in-service or regular detection of various oil and gas pipelines.
Description
technical field [0001] The invention relates to a corrosion detection method, in particular to an ultrasonic detection method for detecting the corrosion degree of the pipe wall of an in-service oil and gas pipeline. Background technique [0002] Non-destructive testing in the prior art includes ultrasonic, ray, magnetic particle, penetrant and other detection methods, among which ultrasonic testing occupies the main position of non-destructive testing due to its wide application range, high accuracy, low cost of use, and environmental protection. . Pipeline corrosion detection is usually used in two detection methods, magnetic flux leakage or ultrasonic. Relatively speaking, the accuracy of magnetic flux leakage detection is lower than that of ultrasonic. Ultrasonic uses the method of measuring the thickness of the workpiece to detect the degree of corrosion. The corrosion of oil and gas pipelines is basically area-type corrosion, and it is considered that there is no poin...
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IPC IPC(8): G01N29/04G01N29/50
CPCG01N29/04G01N29/50G01N2291/02854G01N2291/0289
Inventor 宋伟徐华珍许莹黄超杨耀辉
Owner NANTONG INST OF TECH