A higher order cylindrically guided ultrasonic wave was used for the detection and sizing of hidden pitting-type corrosion in the hidden crevice regions (between the pipe and the pipe supports) without lifting or disturbing the structural layout arrangement of the pipelines. The higher order circumferential guided waves were generated using a piezoelectric crystal based transducer, located at the accessible top region of the pipes, in a pulse-echo mode. By studying the experimental parameters such as dispersion, particle displacement, and wavelength of the ultrasonic guided wave modes, an appropriate higher order mode was selected for excitation using an appropriately designed acrylic angle wedge that conforms to the pipe’s outer curvature. A manual pipe crawler was designed with a provision for holding the wedge, and the essential hardware such as data acquisition card, encoder, etc., was integrated with the system so that the corrosion was mapped in real time during the scanning of the pipes. The system was validated on pipes ranging from outer diameters of wall thicknesses up to , by mapping defects as small as diameter and 25% penetration wall thickness. A 2D finite element model using ABAQUS® was used to understand the wave propagation in pipe wall and its interaction with pinhole-type defects.
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Ultrasonic Circumferential Guided Wave for Pitting-Type Corrosion Imaging at Inaccessible Pipe-Support Locations
K. Shivaraj,
K. Shivaraj
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
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Krishnan Balasubramaniam,
Krishnan Balasubramaniam
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
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C. V. Krishnamurthy,
C. V. Krishnamurthy
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
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R. Wadhwan
R. Wadhwan
Bharath Petroleum Corporation Limited
, Mumbai 400 074, India
Search for other works by this author on:
K. Shivaraj
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
Krishnan Balasubramaniam
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
C. V. Krishnamurthy
Centre for Nondestructive Evaluation, and Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
R. Wadhwan
Bharath Petroleum Corporation Limited
, Mumbai 400 074, IndiaJ. Pressure Vessel Technol. May 2008, 130(2): 021502 (11 pages)
Published Online: March 17, 2008
Article history
Received:
January 28, 2007
Revised:
September 30, 2007
Published:
March 17, 2008
Citation
Shivaraj, K., Balasubramaniam, K., Krishnamurthy, C. V., and Wadhwan, R. (March 17, 2008). "Ultrasonic Circumferential Guided Wave for Pitting-Type Corrosion Imaging at Inaccessible Pipe-Support Locations." ASME. J. Pressure Vessel Technol. May 2008; 130(2): 021502. https://doi.org/10.1115/1.2892031
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