Vol.5 No.3 AA 72- 73-NT 60 -61 - 62 |
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Academic Articles | |||||
Regular Paper | Vol.5No.4 (2014) p.228 - p.237 | ||||
Reliability Assessment for Thickness Inspection of Pipe Wall using Probability of Detection |
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Hiroyuki NAKAMOTO1*, Fumio KOJIMA1 and Sho KATO1 | |||||
1Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo 657-8501, Japan |
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Abstract | |||||
This paper proposes a reliability assessment method for pipe-wall thickness inspection using probability of detection (POD). Pipe-wall thicknesses are measured by certified inspectors with an ultrasonic thickness gauge. Since the inspectors have the different experiences and the frequency of inspections, the measured values are affected by the human factors of the inspectors and include some errors. In order to assess the reliability of inspection, first, the POD functions are determined based on the measured values of the pipe-wall thickness inspection. We verify that the results have the differences depending on five inspectors including two certified inspectors. Second, two human factors that affect the POD are indicated. Finally, it is confirmed that the POD can identify the human factors and assess the reliability for the pipe-wall thickness inspection. | |||||
Keywords | |||||
pipe-wall thickness inspection, reliability assessment, probability of detection, human factor | |||||
Full Paper: PDF
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