A novel X-ray technique for inspection of steel pipes

Ong, P. S.; Anderson, Wallace L.; Cook, Bill D.

doi:10.1007/bf00742582

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…Some of them have been applied for the external inspection of pipes. X-ray [2] employs radiography for interior pipe visualization, whereas ultrasound [3] and eddy current techniques [4] measure the thickness of a pipe. These technologies are not only applied in industrial fields, but also in the field of medicine, as X-ray, ultrasound, and magnetic resonance imaging (MRI) are utilized to perform health screenings.…”

Section: Objectivementioning

confidence: 99%

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Development of a steerable in-pipe locomotive device with six braided tubes

Takeshima

Takayama

2018

Robomech J

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Numerous studies have developed in-pipe locomotive devices to inspect pipes. However, it is difficult to achieve selective locomotion in a branched piping system. In this study, a novel steerable in-pipe locomotive device is proposed based on "a six-braided-tubes locomotive device, " which is an in-pipe locomotive device that is actuated by only six pneumatic inflatable tubes. It is one of the simplest in-pipe locomotive devices that is capable of forward and backward motion and can rotate in clockwise and counterclockwise directions along a pipe, can select the desired pathway in the branched pipe. In this paper, we discuss the background of pipe inspection, classify previously developed in-pipe locomotive devices, and clarify the aim of this study. Additionally, we also describe and extend the locomotive principles of six-braided-tubes locomotive devices. Moreover, we propose a novel attachment, termed steering hook, to enable steering in various types of branched systems. Finally, we experimentally confirm that the novel proposed principle allows the device to correct path selection in an in-pipe branched piping system.

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Section: Objectivementioning

confidence: 99%

“…1 Tokyo Institute of Technology, 4259, Nagatsutacho, Midori-ku, Yokohama-shi, Kanagawa 226-0026, Japan. 2 Osaka University, 2-1, Yamadaoka, Suita-shi, Osaka 565-0871, Japan.…”

Section: Additional Filementioning

confidence: 99%

Development of a steerable in-pipe locomotive device with six braided tubes

Takeshima

Takayama

2018

Robomech J

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“…Nondestructive testing (NDT) techniques are often used in SHM. The most commonly used NDT methods like X-ray [1] , eddy current [2] and magnetic flux [3] methods can also be used in cylindrical structure health monitoring. But because of their point-to-point inspection scheme and human efforts involved during inspection, such methods cannot be cost effective when applied widely on structures that cover large areas such as pipelines.…”

Section: Introductionmentioning

confidence: 99%

Detection and monitoring of axial cracks on cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite

et al. 2012

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In cylindrical structures such as pipelines and pressure vessels, cracks are most likely to occur along the longitudinal (axial) direction and they can be fatal to the serviceability of the structures. Unfortunately, the conventional ultrasonic crack detection techniques, which usually use longitudinal wave, are not very sensitive to this type of cracks. This paper focuses on the detection and monitoring of axial cracks in cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite (MFC). The first order torsional wave is a kind of non-dispersive pure shear wave which propagates at a fixed wave speed. Torsional wave is utilized in this work because, intuitively, it is more sensitive to axial cracks than the family of longitudinal waves. Numerical simulation has been performed using ANSYS to show the effectiveness of torsional wave in detecting and monitoring axial cracks. The time of flight (TOF) of the waves is used to determine the crack position, while the crack propagation is monitored by measuring the variation in the crack induced disturbances. Experiments have also been conducted to investigate the feasibility of the proposed method. MFC transducers oriented at 45˚ against the axis of the specimen are used to generate and receive torsional waves. The experimental results demonstrated that the crack position can be indentified and its growth can be well monitored with the presented approach using torsional wave.

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“…In addition, SHM of tubular structures has also increased in recent decades. However, the commonly used nondestructive testing (NDT) methods (Kim et al, 2004; Mandayam et al, 1997; Ong et al, 1994) are limited in application to cylindrical structures because of the massive work involved and the unsatisfactory reliability of the results. The accessibility of testing equipments of such methods also limits the SHM of continuous cylindrical structures.…”

Section: Introductionmentioning

confidence: 99%

Macro-fiber composite–based structural health monitoring system for axial cracks in cylindrical structures

Cui

Liu

Soh

2013

Journal of Intelligent Material Systems and Structures

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In cylindrical structures such as pipelines and pressure vessels, cracks are most likely to occur along the longitudinal (axial) direction, and they can be fatal to the serviceability of the structures. However, the conventional wave propagation-based crack detection techniques are not sensitive to this type of cracks. This article focuses on the identification of axial cracks in cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite. The first-order torsional wave, which is a nondispersive pure shear wave propagating at a fixed wave speed, is utilized in this work because, intuitively, it is more sensitive to axial cracks than the longitudinal waves. The crack position is determined by the time of flight of the wave pack, while the crack propagation is monitored by measuring the variation in the crack-induced disturbances. Numerical simulations have been conducted to investigate the feasibility of the proposed method, and experimental tests on aluminum pipes have been carried out for verification. Macro-fiber composite transducers oriented at 45°against the axis of the specimen were used to generate and receive the torsional waves. The experimental results demonstrated that the crack position can be identified, and its growth can be well monitored with the proposed approach.

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A novel X-ray technique for inspection of steel pipes

Cited by 14 publications

References 2 publications

Development of a steerable in-pipe locomotive device with six braided tubes

Development of a steerable in-pipe locomotive device with six braided tubes

Detection and monitoring of axial cracks on cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite

Macro-fiber composite–based structural health monitoring system for axial cracks in cylindrical structures

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