This paper proposes a method of applying a reliability of inspection data to a calculation of hazard rate. First, the probability of detection (POD) is calculated from inspection data of thickness measurement of pipe wall by an ultrasonic thickness meter. The inspection data are collected from experiments by qualified or unqualified inspectors. The POD outputs probabilities of reliability assessment based on the inspection data. Second, the probabilities are used for a timing estimation of pipe hazard....
英字タイトル:
Reliability assessment for thickness measurements of pipe wall using probability of detection and application to hazard rate

This paper proposes a reliability assessment method for thickness measurements of pipe wall using probability of detection (POD). Thicknesses of pipes are measured by qualified inspectors with ultrasonic thickness gauges. The inspection results are affected by human factors of the inspectors and include some errors, because the inspectors have different experiences and frequency of inspections. In order to ensure reliability for inspection results, first, POD evaluates experimental results of pipe-wal...
英字タイトル:
Reliability assessment for thickness measurements of pipe wall using probability of detection

Recently, the number of aged traffic structures is increasing in Japan. Most of them require constant maintenance to prevent an accident. Kobe city has a lot of aged illumination pillars and had two fall accidents, unfortunately. To detect an illumination pillar with a defect quickly, we apply a guided wave excited by electromagnetic acoustic transducers to a nondestructive testing system. This method has the potential for low-cost and efficient testing. When testing buried illumination pillars, it is neces...
英字タイトル:
Attenuation of Guided Wave by Buried Part on Nondestructive Testing of Illumination Pillar

This paper is concerned with risk assessment of pipe wall thinning management. The reliability of the NDT systems is evaluated from probability of detection (POD). The statistical uncertainty of NDT reliability is then represented by a conservative confidence bound on the POD function. The idea is applied to the pipe wall thinning management using electro magnetic acoustic transducer....
英字タイトル:
Reliability Assessment of Pipe Wall Thickness Measurementsusing Electro Magnetic Acoustic Transducer

This report is concerned with construction of an inspection robot system. The system is assumed to be composed of a set of nondestructive inspection devices and an autonomous moving robot. The inspection devices are assumed to be set over the target materials used in remote large artifacts while the robot is expected to acquire test data and to supply sufficient energies. This report is devoted to development of inspection device using electromagnetic acoustic transducer (EMAT). Guided wave inspection enabl...
英字タイトル:
Development of Remote Inspection Robot using Electromagnetic Acoustic Transducer