E-Journal of Advanced Maintenance (EJAM)


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Vol.2 No.2

GA 14 - AA 19 - 20 - SP3 ( 21 - 22 - 23 - 24 ) - NT 26 - 27 - 28

Vol.2 No.4

Academic Articles

Regular Paper (Contributed)

Vol.2 (2010) p.101 - p.109

Remote Detection and Quantitative Evaluation of Wall Thinning Volumes in a Metal Pipe

Linsheng LIU

Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan

Abstract

We report a nondestructive method to measure the pipe wall-thinning (PWT) volumes remotely using microwaves. A microwave vector network analyzer (VNA) and a self-designed transmitting and receiving (T&R) coaxial-line sensor are employed in the experiment to generate microwave signals propagating in the metal pipe where the frequency was swept from 14.00 to 14.21 GHz. A brass pipe with inner diameter of 17.03 mm, 1.0 mm wall thickness, 2.0 m length, and connected respectively with 9 joints having the lengths of 17.0 mm and PWT volumes from 0 to 550 mm3 were measured. By taking the pipe as a circular waveguide of microwave, after building up a resonance condition and then solving the resonance equations, the remote detection method is achieved. By comparing the experimental results with the evaluated ones using our method, it is found that the evaluated results agree well with the experimental ones, it indicates that a high precision evaluation method is established.

Keywords

Remote detection, Wall thinning, Microwave, Nondestructive measurement, Metal pipe

Full Paper: PDF EJAM Vol.2 pp.101-109 "Remote Detection and Quantitative Evaluation of Wall Thinning Volumes in a Metal Pipe"

Article Information
Article history:
Received 5 September 2010
Accepted 17 November 2010


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