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Authors: Rosen K. Rachev (University of Bristol; Baker Hughes, a GE company) , Alexander Velichko (University of Bristol) , Paul Wilcox (University of Bristol)
Detection and depth sizing of surface breaking defects in large diameter pipes is of vital importance in the petrochemical industry. An analytical forward model is presented and used to simulate ultrasonic phased array data in an inspection geometry close to that experienced by a pipeline inspection gauge. The data has been imaged with Total Focusing Method (TFM) and Plane Wave Imaging (PWI). Image-based depth sizing has been applied using a minimum bounding box around pixels above a threshold intensity. Initial results are presented from a half-skip transverse wave imaging and sizing of crack-like defects of depths between 1 and 6 mm and orientation angles between –25° and 25°. TFM results show good agreement with nominal values in the –10° to 10° angular range for all depths. PWI outputs similar results with less than a sixth of the data.
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How to Cite: Rachev, R. K. , Velichko, A. . & Wilcox, P. . (2019) “Ultrasonic immersion testing for depth sizing of crack-like defects in large diameter pipes”, Review of Progress in Quantitative Nondestructive Evaluation.(0).