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research-article

An Improved Phased Array Ultrasonic Testing Technique for Thick-Wall Polyethylene Pipe Used in Nuclear Power Plant

[+] Author and Article Information
Yinkang Qin

Institute of Process Equipment Zhejiang University, Hangzhou 310027, Zhejiang, PR China
qinyinkang@zju.edu.cn

Jianfeng Shi

Institute of Process Equipment, Zhejiang University, Hangzhou 310027, Zhejiang, PR China; Engineering Research Center of High Pressure Process Equipment and Safety, Ministry of Education, P.R. China
shijianfeng@zju.edu.cn

Jinyang Zheng

Institute of Process Equipment, Zhejiang University, Hangzhou 310027, Zhejiang, PR China; Engineering Research Center of High Pressure Process Equipment and Safety, Ministry of Education, P.R. China; State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, P.R. China
jyzh@zju.edu.cn

Dongsheng Hou

Institute of Process Equipment Zhejiang University, Hangzhou 310027, Zhejiang, PR China
houdongsheng@zju.edu.cn

Weican Guo

Zhejiang Provincial Special Equipment Inspection and Research Institute Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province, Hangzhou 310020, Zhejiang, PR China
gwcndt@126.com

1Corresponding author.

ASME doi:10.1115/1.4043384 History: Received November 04, 2018; Revised March 29, 2019

Abstract

With the application of High-density polyethylene (HDPE) pipe with thick wall in nuclear power plant (NPP), great attention has been paid to the safety of the pipeline joints, which can be assessed by phased array ultrasonic testing (PAUT). PAUT creates constructive interference of acoustic waves to generate focused beams according to delay law based on time-of-flight. However, due to the existence of acoustic attenuation and dispersion, waveform distortion occurs when ultrasonic pulse propagates in HDPE, which will accumulate with the increase of propagation distance, and then results in imaging errors. In this paper, the relationship of acoustic attenuation and dispersion in HDPE was obtained by numerical simulation in Field II®, which can be verified by the experiment of our previous work. Besides, the investigation of the waveform distortion revealed the linear relation between peak offset and propagation distance. Considering the relation, an improved delay law was proposed to increase the intensity of ultrasonic field. This improved delay law was compared with the conventional one by numerical simulation of ultrasonic field and PAUT experiments, which showed that the improved delay law could increase the image sensitivity.

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