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Power station thick-walled pipeline ultrasonic guided wave detecting method

An ultrasonic guided wave and detection method technology, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, can solve the problems of difficult to obtain guided waves, low detection frequency, and difficult tasks, achieve obvious economic and safety benefits, and reduce detection. Cost and effect of reducing on-site requirements

Active Publication Date: 2010-06-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology

However, with the increase of the frequency-thickness product, the mode of the guided wave increases. On the one hand, it is required to use a relatively low detection frequency. On the other hand, the number of detection probes required increases sharply. Difficulty in guided wave
[0005] In summary, for the four major pipelines of power plant boilers with a length of hundreds of meters, if a comprehensive inspection is carried out, the task will be very difficult and the reliability will be poor

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  • Power station thick-walled pipeline ultrasonic guided wave detecting method
  • Power station thick-walled pipeline ultrasonic guided wave detecting method
  • Power station thick-walled pipeline ultrasonic guided wave detecting method

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Embodiment Construction

[0031] The present invention is aimed at the ultrasonic guided wave detection method of the thick-walled pipeline of the power station, which is a kind of non-destructive detection method. It mainly uses an ultrasonic detector and an ultrasonic guided wave sensor (probe) for detection. The specific steps are as follows:

[0032] (1) Select the probe for detection: according to the outer diameter, thickness, and material of the pipeline to be inspected, select a special ultrasonic guided wave probe, select the detection frequency as 1MHz±0.5MHz, the size of the probe chip is 20mm×20mm, 27.5°±2°, the probe incident angle, the horizontal deviation angle of the probe sound beam axis should not be greater than 2°, there should be no obvious double peaks in the vertical direction of the main sound beam, and the ultrasonic guided wave probe is required to detect the length × width at a distance of 400mm The signal-to-noise ratio of simulated cracks with a depth of 20mm×0.4mm×1.5mm is ...

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Abstract

The invention belongs to the field of nondestructive detection, and particularly relates to a power station thick-walled pipeline ultrasonic guided wave detecting method, wherein the method comprises the following steps of: selecting an ultrasonic guided wave detecting probe; selecting an ultrasonic guided wave detecting instrument; manufacturing a sensitivity test block; making a distance-amplitude curve; scanning; carrying out flaw size measurement; and verifying and grading detecting results. The detecting method is suitable for comprehensively detecting the flaws of pipelines with different pipe diameters and thicknesses, and is particularly suitable for comprehensively detecting power station thick-walled pipelines. The detecting method has the characteristics of rapidness, simpleness, safety and reliability, can overcome some limitations of a conventional nondestructive detection method, lowers the manual detection intensity and saves human and material resources.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, in particular to an ultrasonic guided wave testing method for thick-walled pipelines in power stations. Background technique [0002] Power plant boiler main steam, reheat steam hot section, reheat steam cold section and main water supply pipeline are high temperature and high pressure components, which are the focus of metal supervision and inspection. During operation, the inside of the pipeline is subjected to high temperature and pressure. Once it explodes, its high-temperature steam will produce a great impact, which will cause great damage to nearby equipment and staff. In response to the four major pipeline explosion injury accidents that occurred from 1999 to 2006, the State Electricity Regulatory Commission and the State Administration of Quality Supervision, Inspection and Quarantine issued separate documents, requiring all relevant power plants to effectively strengthen the safet...

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Application Information

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IPC IPC(8): G01N29/04
Inventor 蔡红生李世涛
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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