A Study on the Equipotent Switching Direct Current Potential Drop Method for the Monitoring of Piping Thinning

Abstract:

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Flow Accelerated Corrosion (FAC) has become a hot issue because of aging of passive components. Ultrasonic Technique (UT) has been adopted to inspect the secondary piping. UT, however, covers only narrow region, which results in numerous detecting points and thus takes time. In this paper, we suggested a Wide Range Monitoring (WiRM) concept with Equipotent Switching Direct Current Potential Drop (S-DCPD) method to monitor the thickness of piping. Since the DCPD method covers area, not a point, it needs less monitoring points. We use the SDCPD method to screen the candidate area to monitor. Based on the monitoring results, we can determine the inspection area. To improve the applicability to the piping system, we suggested the Equipotent concept, which eliminates the leakage current. Finite element analysis results and developed resistance model are presented for the simple analysis to describe the wall thinning by DCPD signals. And also validation test results are presented, from which we can identify the consistency of the model and the experiment.

Info:

Periodical:

Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim

Pages:

1331-1334

Citation:

K. H. Ryu et al., "A Study on the Equipotent Switching Direct Current Potential Drop Method for the Monitoring of Piping Thinning ", Key Engineering Materials, Vols. 345-346, pp. 1331-1334, 2007

Online since:

August 2007

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Price:

$38.00

[1] Na Young Lee et al: Development of the monitoring system to detect the piping thickness reduction, NPIC&HMIT 2006, Albuquerque, US, Nov. (2006).

[2] H. H Johnson: Calibrating the Electric Potential method for Studying Slow Crack Growth, Material Research and Standards, Vol. 5, No. 9, September, 1965, pp.442-445.

[3] Bindi Chexal et al: Flow-Accelerated Corrosion in Power Plants, EPRI TR-106611, Electric Power Research Institute, (1996).

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