Research on Pipeline Damage Imaging Technology Based on Ultrasonic Guided Waves

Abstract

Pipeline structures are important structural components that cannot be replaced in actual engineering applications. Damage to a pipeline structure will create substantial safety hazards and economic losses in a project. Therefore, it is extremely important to study damaged pipeline structures. In this paper, L(0,2) mode guided waves are used to identify, locate, and image single and double defects in straight pipe structures. For the case where there is a single defect in the straight pipe section, the influence of different excitation frequencies on the reflection coefficient of L(0,2) modal guided wave is studied, and the optimal excitation frequency of L(0,2) guided wave is 70 kHz when single damage is determined. For the case of double defects in the straight pipe section, the double-defect size, the distance between the defects, and the relative defect positions are studied, and the influence of the defect recognition effect is analyzed. The propagation path of the ultrasonic guided wave in the double-defect pipe section is analyzed. Finally, the effectiveness of the three-point axial positioning method and damage imaging method is verified by the single-defect tube segment ultrasonic guided wave flaw detection experiment.

PPM EMAT for Defect Detection in 90-Degree Pipe Bend

“…Qi [13] used piezoelectric sensors to excite 75 kHz low-frequency guided waves to detect defects in carbon steel bends. He [14] used piezoelectric sensors to excite L (0, 2) guided waves with a frequency of 50 kHz to detect iron bends. Chen [15] and Zhu [16] used magnetostrictive guided waves at about 40 kHz to detect defects in the bend of carbon steel pipes.…”

Multihelical Lamb Wave Imaging for Pipe-Like Structures Based on a Probabilistic Reconstruction Approach

“…Guided wave of multiple modes can be generated in the pipe [9]. The axially propagating guided wave, including longitudinal and torsional modes, is commonly applied in current researches [10]- [12]. The electromagnetic acoustic transducer (EMAT) owns the non-contact characteristic and it can be used in a wide variety of applications [13].…”

Characteristic analysis of electromagnetic acoustic transducers for helical shear horizontal wave based on magnetostrictive effect

“…1 In the long-term service of the pipeline, aging and corrosion will inevitably occur. 2,3 Once the oil or gas leaks, it will often cause huge economic losses and also damage the ecological environment. Therefore, regular inspection of pipelines is significant in ensuring the energy security, protecting the natural environment, and maintaining the safety of property .…”