To secure the integrity of new constructed pipeline, the inspection of the girth welds requires proven and qualified technology. Although the current inspection concepts based on (combinations of) zonal discrimination, ToFD and sectorial scans are renowned, limitations inherent to the inspection philosophy can lead to uneconomic compromises to secure pipeline integrity.
While pipeline projects become more challenging and the pipeline design becomes more complex, the need for more accurate and reliable inspection technologies becomes more apparent. Due to advances in computer technology (faster processing and larger storage capacity), the development of a novel inspection philosophy ‘IWEX’ (Inverse Wave Field Extrapolation) based on FMC (Full Matrix Capture (FMC), being the ultrasonic imaging of data, has become possible.
With this new innovative inspection technique, indications in girth welds are imaged real time in 2D and 3D. The images reveal the presence of indications whereby the orientation, position, height, etc, are displayed in true context to the back and front wall and the cap and root reinforcement geometry. Identification and sizing of indications can be done accurately and unambiguously, leading to a reduced repair rate. Because the images are independent of the weld bevel design, a standardized sensitivity block can be used, whereby the work preparation and the number of calibration blocks are reduced significantly. read more
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