Development and application of guided wave technology for buried piping inspection in nuclear power plant

Pei, Kuang-Chih; Shyu, Hung-Fa; Lee, Ping-Hung; Toung, Jean-Chung

doi:10.1109/ultsym.2015.0080

Cited by 4 publications

(3 citation statements)

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“…monitoring of corrosion defects). This scenario is substantially different from the test setup used in previous works [9,13,15,22], where the pipe sample was buried in a sand/ soil box in a controlled environment, and the GW collar was installed at the end of a small segment of the pipe left outside of the box with no direct contact between sand/soil and the collar. The design of the ultrasonic collar in this work, was based on the results of finite element analysis, which characterized the response of individual sensors, and also of complete sensor arrays.…”

Section: Introductionmentioning

confidence: 95%

“…Bertoncini [14] presented attenuation values for unburied pipe with PE coating, PE and Fusion Bonded Epoxi half-buried, PE buried and unburied bitumen coated. Pei [15] studied T(0,1) attenuation in pipes that were bare, and in others that had PE and bitumen tape coatings in buried conditions. Limited studies on wave propagation in Stopaq are available, though, and only in guided wave tomography mode.…”

Section: Introductionmentioning

confidence: 99%

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Design and In Situ Validation of a Guided Wave System for Corrosion Monitoring in Coated Buried Steel Pipes

et al. 2019

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Ultrasonic guided waves allow long-range screening of the full cross-section of pipelines and are thus ideal for corrosion detection. Systems using removable arrays of sensors for one-off inspections are nowadays widely-available. Guided wave pipeline monitoring, on the other hand, consists of using cheap, robust and usually permanently-mounted sensors to compare the present state of the structure with a previous or undamaged condition. Current application of available monitoring systems shows that robustness and defect detection capability remain a challenge, and some major oil and gas companies therefore consider monitoring to be less well-established. This paper deals with the design and testing of a system designed for monitoring buried and coated pipelines, focusing especially on the development of an array (or collar) of sensors. It starts by showing in detail the characterization of single piezoelectric transducers. Finite element modelling was then used to establish the dimensions of an array of these transducers, and to describe its wave-field generation characteristics. These results were then validated experimentally, initially in laboratory conditions; subsequently, a prototype was built and blind tested in near-operational conditions, which consisted of a buried full-scale pipe segment coated with Stopaq and polyethylene. The pipe segment was subjected to electrolytically accelerated corrosion at uncertain locations and at a rate which was unknown to the authors at LAMEF-UFRGS who were involved in data analysis. Results show that after 2 years of periodic data gathering, the collar showed good stability and robustness, and that it was able to detect corrosion defects found in the dissection of the pipe.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Design and In Situ Validation of a Guided Wave System for Corrosion Monitoring in Coated Buried Steel Pipes

et al. 2019

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“…In fact, the large variability with sand conditions and the high values of attenuation revealed why test ranges of GWT are variable and are greatly decreased in buried pipes. Chiu et al [223] showed that GW attenuation and buried depth were not related linearly. In fact, GW attenuation rate, which determines the range of detection, is mainly and permanently affected by soil pressure (see Table 5).…”

Section: Limitations and Capabilities Of Gwutmentioning

confidence: 99%

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

Ghavamian

Mustapha

Baharudin

et al. 2018

Sensors

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This paper aims to provide an overview of the experimental and simulation works focused on the detection, localisation and assessment of various defects in pipes by applying fast-screening guided ultrasonic wave techniques that have been used in the oil and gas industries over the past 20 years. Major emphasis is placed on limitations, capabilities, defect detection in coated buried pipes under pressure and corrosion monitoring using different commercial guided wave (GW) systems, approaches to simulation techniques such as the finite element method (FEM), wave mode selection, excitation and collection, GW attenuation, signal processing and different types of GW transducers. The effects of defect parameters on reflection coefficients are also discussed in terms of different simulation studies and experimental verifications.

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An Online Monitoring Technique for Long-Term Operation Using Guided Waves Propagating in Steel Pipe

Bertoncini

Cappelli

Cordella

et al. 2017

Journal of Nuclear Engineering and Radiation Science

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Nondestructive testing (NDT) techniques are widely used as a reliable way for preventing failures and helping in the maintenance design and operation of critical infrastructures and complex industrial plants as nuclear power plants (NPPs). Among the NDT techniques, guided waves (GWs) are a very promising technology for such applications. GWs are structure-borne ultrasonic waves propagating along the structure confined and guided by its geometric boundaries. Testing using GWs is able to find defect locations through long-range screening using low-frequency waves (from 5 to 250 kHz). The technology is regularly used for pipe testing in the oil and gas industry. In the nuclear industry, regulators are working to standardize monitoring and inspection procedures. To use the technology inside an active plant, operators must solve issues like high temperatures (up to more than 300 °C inside a light-water reactor's primary piping), high wall thickness of components in the primary circuit, and characteristic defect typologies. Magnetostrictive sensors are expected to overcome such issues due to their physical properties, namely, robust constitution and simplicity. Recent experimental results have demonstrated that magnetostrictive transducers can withstand temperatures close to 300 °C. In this paper, the GW technology will be introduced in the context of NPPs. Some experimental tests conducted using such a methodology for steel pipe having a complex structure will be described, and open issues related to high-temperature guided wave applications (e.g., wave velocity or amplitude fluctuations during propagation in variable temperature components) will be discussed.

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Development and application of guided wave technology for buried piping inspection in nuclear power plant

Cited by 4 publications

References 0 publications

Design and In Situ Validation of a Guided Wave System for Corrosion Monitoring in Coated Buried Steel Pipes

Design and In Situ Validation of a Guided Wave System for Corrosion Monitoring in Coated Buried Steel Pipes

Detection, Localisation and Assessment of Defects in Pipes Using Guided Wave Techniques: A Review

An Online Monitoring Technique for Long-Term Operation Using Guided Waves Propagating in Steel Pipe

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