Helical comb magnetostrictive patch transducers for inspecting spiral welded pipes using flexural guided waves

Zhang, Xiaowei; Tang, Zhifeng; Lv, Fuzai; Pan, Xiaohong

doi:10.1016/j.ultras.2016.08.024

Cited by 35 publications

(17 citation statements)

References 28 publications

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“…87,89,90 Other modes have been investigated for use in inspection. [91][92][93][94][95] For example, recent work has demonstrated the enhanced detection circular and crack-like defects by analyzing the scatter of higher order torsional and flexural modes. 96 Guided waves for pipeline inspection are generated in a manner similar to the ones used for ultrasonic inspection.…”

Section: Electrical Phenomenamentioning

confidence: 99%

Inspection and monitoring systems subsea pipelines: A review paper

El-Borgi

Patil

et al. 2019

Structural Health Monitoring

141

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One of the largest movers of the world economy is the oil and gas industry. The industry generates billions of barrels of oil to match more than half the world’s energy demands. Production of energy products at such a massive scale is supported by the equally massive oil and gas infrastructure sprawling around the globe. Especially characteristic of the industry are vast networks of pipelines that traverse tens of thousands of miles of land and sea to carry oil and gas from the deepest parts of the earth to faraway destinations. With such lengths come increased chances for damage, which can have disastrous consequences owing to the hazardous substances typically carried by pipelines. Subsea pipelines in particular face increased risk due to the typically harsher environments, the difficulty of accessing deepwater pipelines, and the possibility of sea currents spreading leaked oil across a wide area. The opportunity for research and engineering to overcome the challenge of subsea inspection and monitoring is tremendous and the progress in this area is continuously generating exciting new developments that may have far reaching benefits far outside of subsea pipeline inspection and monitoring. Thus, this review covers the most often used subsea inspection and monitoring technologies as well as their most recent developments and future trends.

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Section: Electrical Phenomenamentioning

confidence: 99%

Inspection and monitoring systems subsea pipelines: A review paper

El-Borgi

Patil

et al. 2019

Structural Health Monitoring

141

View full text Add to dashboard Cite

show abstract

“…In the frequency range lower than 180 kHz, as sketched in Figure 1(a), only two modes can be generated. It is more difficult to generate pure flexural mode compared to longitudinal modes due to the difficulties in the sensor design [15]. Therefore, the lowest-order longitudinal mode referred as L(0,1) was selected for defect detection in the investigated smalldiameter tube.…”

Section: Longitudinal Guided Waves In Small-diameter Elbowed Tubesmentioning

confidence: 99%

Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor

Liu

Yang³

et al. 2019

Journal of Sensors

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In the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow region to generate F(1,1) mode, followed by slow and weak F(2,1) mode. The guided wave reflected from the elbow with a through-wall defect was manifested as two overlapped wave packets, which were good indicators of a defective elbow. To conduct L(0,1) mode guided waves inspection on the small-diameter elbowed tubes, a novel tailored squirrel-cage magnetostrictive sensor was employed in the experiment. The new sensor employed the configuration of segmental iron-cobalt strips and small-size permanent magnet arrays. The entire sensor is composed of two identical C-shaped sensor elements and can be recycled and installed conveniently. Experimental results obtained from healthy and defective tubes were consistent with the conclusions obtained from finite element simulations. An artificial through-wall defect at the elbow and a notch defect at the straight part of the tube could be simultaneously detected by L(0,1) mode guided waves through comparing experimental signals with simulation results.

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“…Pulse‐echo guided wave testing mode permits inaccessible areas to be investigated to detect corrosion in pipe risers. Ultrasonic guided wave (UGW) is a low‐attenuation, rapid, and accurate nondestructive testing method. When defects occur in pipe risers, there are flaw echoes in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Axial magnetized patch for efficient transduction of longitudinal guided wave and defect identification in concrete-covered pipe risers

Fang

Tse

2018

Struct Control Health Monit

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Pipe risers partially covered by a wall are difficult to test because the concrete causes large attenuation and mode conversion. Both reasons make it difficult to analyze the signal. This paper reports the design of an axial magnetized magnetostrictive patch transducer (AM-MPT) for efficient transduction of longitudinal guided wave, which can be used to detect defects in concrete-covered pipe risers. First, the paper started with a theoretical background about the influence of length-to-width ratio of the magnetized rectangular patch on the demagnetizing factors and the magnetic field intensity of the patch. Second, the simulation and experimental results proved that the length-to-width ratio of the magnetized iron cobalt patch has a great influence on its magnetic field intensity and signal amplitude of the AM-MPT. Comparison experiments proved that the static magnetic field of AM-MPT provided by an iron cobalt patch led to larger signal amplitudes than those provided by magnets. Third, the attenuation of L(0,2) in concrete-covered pipe riser were studied using the AM-MPT experimentally, which were according with disperse simulation results basically. And the experimental results proved that AM-MPT was more suitable to be applied in concrete-covered pipe risers testing than original MPT.Finally, the AM-MPT was applied in a defect identification of concrete-covered pipe riser sample. The experimental results for the AM-MPT and the piezoelectric transducer showed that the AM-MPT can potentially be applied in pipe riser defect identification.

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Helical comb magnetostrictive patch transducers for inspecting spiral welded pipes using flexural guided waves

Cited by 35 publications

References 28 publications

Inspection and monitoring systems subsea pipelines: A review paper

Inspection and monitoring systems subsea pipelines: A review paper

Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor

Axial magnetized patch for efficient transduction of longitudinal guided wave and defect identification in concrete-covered pipe risers

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