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Research Papers: Materials and Fabrication

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,
College of Energy Engineering,
Zhejiang University,
Hangzhou, Zhejiang 310027, China
e-mail: qinyinkang@zju.edu.cn

Jianfeng Shi

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Hangzhou, Zhejiang 310027, China;
Engineering Research Center of High Pressure
Process Equipment and Safety,
Ministry of Education,
Hangzhou, Zhejiang 310027, China
e-mail: shijianfeng@zju.edu.cn

Jinyang Zheng

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Hangzhou, Zhejiang 310027, China;
Engineering Research Center of High Pressure
Process Equipment and Safety,
Ministry of Education,
Hangzhou, Zhejiang 310027, China;
State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
Hangzhou, Zhejiang 310027, China
e-mail: jyzh@zju.edu.cn

Dongsheng Hou

Institute of Process Equipment,
College of Energy Engineering,
Zhejiang University,
Hangzhou, Zhejiang 310027, China
e-mail: 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, Zhejiang 310020, China
e-mail: gwcndt@126.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 4, 2018; final manuscript received March 29, 2019; published online May 8, 2019. Editor: Young W. Kwon.

J. Pressure Vessel Technol 141(4), 041403 (May 08, 2019) (9 pages) Paper No: PVT-18-1240; doi: 10.1115/1.4043384 History: Received November 04, 2018; Revised March 29, 2019

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 between 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. Then, 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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References

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Figures

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Fig. 1

Numerical simulation model

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Fig. 2

Initial ultrasonic pulse: (a) time domain and (b) frequency domain

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Fig. 3

Comparison between numerical simulation and the experiment [23]: (a) attenuation coefficient and (b) phase velocity

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Fig. 4

Time signals of acoustic pressure at different locations: (a) with attenuation and dispersion, (b) without attenuation and dispersion, and (c) only with frequency independent attenuation

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Fig. 5

Principle for computing delay law

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Fig. 6

Relations between peak offset and propagation distance: (a) attenuation constant, (b) acoustic velocity, (c) waveform, and (d) center frequency

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Fig. 7

Principle for computing delay compensation

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Fig. 8

Relation between compensation coefficient and attenuation constant

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Fig. 9

Normal beam focusing ultrasonic fields for different focal depths: (a) F = 25 mm, (b) F = 50 mm, (c) F = 70 mm, and (d) F = 90 mm

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Fig. 10

Amplitude of acoustic pressure in center line

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Fig. 11

Deflection beam focusing ultrasonic fields for different focal depths: (a) F = 25 mm, (b) F = 50 mm, (c) F = 70 mm, and (d) F = 90 mm

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Fig. 12

Amplitude of acoustic pressure in center line

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Fig. 13

Phased array ultrasonic inspection setup

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Fig. 14

Inspection blocks

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Fig. 15

Inspection result (F =50 mm, θ = 0 deg, Na = 32, and gain = 51 dB): (a) conventional delay law and (b) improved delay law

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Fig. 16

Inspection result (F =50 mm, θ = 45 deg, Na = 32, and gain = 37 dB): (a) conventional delay law and (b) improved delay law

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