Phased array ultrasonic detection method for polyethylene tube in nuclear power plant
An ultrasonic detection and phased array technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and measurement devices, etc. , The phased array focused sound beam cannot cover the PE pipe and other problems, so as to improve the detection effect and overcome the poor focusing effect.
Active Publication Date: 2018-09-18
ZHEJIANG UNIV
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The increase of the pipe wall thickness will lead to the continuous accumulation of attenuation and dispersion effects, the phased array focused sound beam cannot cover the deep position inside the PE pipe, and the detection sensitivity and accuracy will decrease
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[0057] According to the phased array ultrasonic detection method for the PE pipe of the nuclear power plant provided by the invention, non-destructive testing can be implemented on the PE pipe of the nuclear power plant. Take the PE pipe for cooling water in the periphery of a nuclear power plant as an example. The detection depth of this section of PE pipe needs to reach 50mm. According to this requirement, the polyethylene detection test block is processed. Its structure is as follows: Figure 4 shown. The phased array ultrasonic detector produced by a certain company has two modes of linear scanning and sector scanning; it can realize 32-channel reception and independent 128-channel transmission, and can support phased array probes with a maximum of 128 array elements; it also supports A / S / B / C and other display modes. The center frequency of the phased array probe is 2.0MHz, with 32 array elements, the array element spacing is 1.0mm, the array element width is 0.9mm, the ...
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The invention relates to a polyethylene tube detection technology, and aims at providing a phased array ultrasonic detection method for a polyethylene tube in a nuclear power plant. The method comprises the following steps: confirming that the surface quality of a PE tube joint to be tested meets the testing requirements, and removing surface dirt; connecting a phased array probe with a phased array ultrasonic detector, and placing the phased array probe on the PE tube coated with a coupling agent; setting all the parameters of the ultrasonic detector, calculating the delay time of each arrayelement to realize phased array focusing and deflection, and further adjusting the detection parameters to obtain the best imaging effect of a target detection area; and circumferentially moving the phased array probe along the cross section of the PE tube after the obtaining of the best detection parameters to realize the all-round detection of the PE tube, and recording the defect orientation and the detection result when a defect is found. A delay rule adopted by the invention considers the acoustic attenuation and frequency dispersion effects of PE, and delay compensation is performed on the basis of a conventional delay rule. The method overcomes the shortcoming of poor focusing in the PE in traditional ultrasonic delay rules, and improves the detection effect.
Description
technical field [0001] The invention relates to polyethylene pipe detection technology, in particular to a phased array ultrasonic detection method considering polyethylene sound attenuation and dispersion effects. Background technique [0002] Compared with traditional metal pipes, PE pipes have superior corrosion resistance and have decades of application experience in the field of oil and gas transportation. In recent years, PE pipes have been gradually applied to the peripheral cooling water delivery system of nuclear power plants, such as Callaway in the United States and Sanmen in China. The joint is the weakest link on the PE pipeline. According to the welding process, it can be divided into a hot-melt butt joint and an electric fusion joint. During the welding process, PE pipe joints may have defects, which will affect the safe operation of nuclear power plants. Therefore, ASME code case N-755 stipulates that PE pipes in nuclear power plants need to be visually ins...
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IPC IPC(8): G01N29/06
CPCG01N29/069G01N2291/0235
Inventor 施建峰秦胤康姚日雾郑津洋郭伟灿钟海见
Owner ZHEJIANG UNIV