51314-4134-Application of Temperature Compensated Fixed Mount Multichannel UT Device to Examine Erosion in a Bend and High-Precision Corrosion Rates of Pit Inhibition

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Product Number: 51314-4134-SG

ISBN: 4134 2014 CP

Author: David Blumer

Publication Date: 2014

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A fixed mount multichannel UT device with improved temperature compensation has been developed. Utilizing a fixed mount approach and the improved temperature compensation help improve the accuracy and the resolution of the wall thickness measurements. When equipped with sixteen transducers it allows for the generation of a wall thickness loss (erosion and/or corrosion) contour map ensuring that an area of localized wall loss is not missed. Extensive laboratory testing using an outdoor flow loop and a field trial have been performed with the device. The laboratory flow loop testing investigated the magnitude and location of erosion for a variety of operating conditions. Gas and liquid flow rates were varied examining gas only low liquid loading annular and slug flows. The need for multiple transducers is demonstrated as the location of maximum erosion changes significantly from gas dominant low liquid flows to slug flow. The field trial on a large scale water injection system tested the performance of different corrosion inhibitors and various doses on the corrosion rate of known existing pits in sea water and produced water pipelines using direct wall thickness measurements by the UT device. The high precision of the measurements allowed for the quick validation of the inhibitor performance on known pits in the pipe wall itself in agreement with results from corrosion monitoring probes and coupons.