Rapid, long range inspection of chemical plant pipework using guided waves

Alleyne, David; Pavlakovic, B.; Lowe, M. J. S.; Cawley, P.

doi:10.1063/1.1373757

Cited by 168 publications

(123 citation statements)

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“…Use of long range guided waves for piping inspection is reported by Cawley (1996, 1997), Pei et (1996), Rose @J. (1996), Lowe et (1998), Bray a (1998), Alleyne et (2000) and Wassink et (2000).…”

Section: Long Range Guided Wave Testingmentioning

confidence: 99%

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Non-Destructive Testing Methods for Geothermal Piping.

Berndt¹

2001

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SUMMARYNon-destructive testing is a key component of optimized plant inspection and maintenance programs.Risk based inspection, condition based maintenance and reliability centered maintenance systems all require detection, location and sizing of defects or flaws by non-destructive methods. Internal damage of geothermal piping by corrosion and erosion-corrosion is an ongoing problem requiring inspection and subsequent maintenance decisions to ensure safe and reliable performance. Conventional manual ultrasonic testing to determine remaining wall thickness has major limitations, particularly when damage is of a random and localized nature. Therefore, it is necessary to explore alternative non-destructive methods that offer potential benefits in terms of accurate quantification of size, shape and location of damage, probability of detection, ability to use on-line over long ranges, and economics. A review of non-destructive methods and their applicability to geothermal piping was performed. Based on this, ongoing research will concentrate on long range guided wave and dynamic methods.

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Section: Long Range Guided Wave Testingmentioning

confidence: 99%

“…A guided wave system has been developed to test pipes 2 to 24 inches in diameter over a range of 50 m (Alleyne et al, 2000). Three or four rings of dry coupled piezoelectric transducers are clamped to the external pipe surface to excite low frequency longitudinal L (0,2) mode waves.…”

Section: Long Range Guided Wave Testingmentioning

confidence: 99%

Non-Destructive Testing Methods for Geothermal Piping.

Berndt¹

2001

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“…Guided elastic waves (Lamb waves) have been widely acknowledged as one of the most promising tools for long range detection of various types of defect in different materials and structures [24], and deployable-guided wave systems have been successfully used for industrial NDT inspections of simple structures such as pipes [25][26][27] and rails [28,29]. Because a guided wave sensor can potentially detect damage over a significant surrounding area, a permanent sparse array of guided wave sensors in pitch-catch mode is an ideal candidate for large-area SHM.…”

Section: System Design (A) Methodology and Objectivesmentioning

confidence: 99%

Remote inspection system for impact damage in large composite structure

Zhong¹,

Croxford²,

Wilcox³

2015

Proc. R. Soc. A.

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A significant opportunity for reducing the weight of composite aircraft is through the development of an economically efficient method to detect barely visible or invisible impact damage sustained in service. In this paper, a structurally integrated, inert, wireless system for rapid, large-area impact damage detection in composite is demonstrated. Large-area inspection from single sensors using ultrasonic-guided waves is achieved with a baseline-subtraction technique. The wireless interface uses electromagnetic coupling between coils in the embedded sensor and inspection wand. Compact encapsulated sensor units are built and successfully embedded into composite panels at manufacture. Chirp-based excitation is used to enable single-shot measurements with high signal-torandom-noise ratio to be obtained. Signal processing to compensate for variability in inspection wand alignment is developed and shown to be necessary to obtain adequate baseline subtraction performance for damage detection. Results from sensors embedded in both glass fibre and carbon fibre-reinforced composite panels are presented. Successful detection of a 10 J impact damage in the former is demonstrated at a range of 125 mm. Quantitative extrapolation of this result suggests that the same level of impact damage would be detectable at a range of up to 1000 mm with an inspection wand alignment tolerance of 4 mm.

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“…Therefore, the non-destructive testing (NDT) of pipelines has become an important discipline for infrastructure management. Using ultrasonic guided waves is an effective method for long-range pipeline inspection; it has received considerable attention [1][2][3][4] and has been exploited successfully from a commercial point of view [5]. In guided wave pipeline inspection, the guided waves are emitted by active sensors which propagate along the pipeline structure under inspection.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

An adaptive sparse deconvolution method for distinguishing the overlapping echoes of ultrasonic guided waves for pipeline crack inspection

Chang

Zhao

et al. 2017

Meas. Sci. Technol.

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In guided wave pipeline inspection, echoes reflected from closely spaced reflectors generally overlap, meaning useful information is lost. To solve the overlapping problem, sparse deconvolution methods have been developed in the past decade. However, conventional sparse deconvolution methods have limitations in handling guided wave signals, because the input signal is directly used as the prototype of the convolution matrix, without considering the waveform change caused by the dispersion properties of the guided wave. In this paper, an adaptive sparse deconvolution (ASD) method is proposed to overcome these limitations. First, the Gaussian echo model is employed to adaptively estimate the column prototype of the convolution matrix instead of directly using the input signal as the prototype. Then, the convolution matrix is constructed upon the estimated results. Third, the split augmented Lagrangian shrinkage (SALSA) algorithm is introduced to solve the deconvolution problem with high computational efficiency. To verify the effectiveness of the proposed method, guided wave signals obtained from pipeline inspection are investigated numerically and experimentally. Compared to conventional sparse deconvolution methods, e.g. the l 1 -norm deconvolution method, the proposed method shows better performance in handling the echo overlap problem in the guided wave signal.

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Rapid, long range inspection of chemical plant pipework using guided waves

Cited by 168 publications

References 0 publications

Non-Destructive Testing Methods for Geothermal Piping.

Non-Destructive Testing Methods for Geothermal Piping.

Remote inspection system for impact damage in large composite structure

An adaptive sparse deconvolution method for distinguishing the overlapping echoes of ultrasonic guided waves for pipeline crack inspection

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