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10351 Detection and Monitoring of Napthenic Acid Corrosion in a Visebreaker Unit Using Hydrogen Flux Measurements

Picture for 10351 Detection and Monitoring of Napthenic Acid Corrosion in a Visebreaker Unit Using Hydrogen Flux
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Product Number: 51300-10351-SG
ISBN: 10351 2010 CP
Author: Timothy F. Rudd, John M. O'Kane, David Cooke, Stephen W. Powell and Frank W. H. Dean
Publication Date: 2010
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Corrosion rates of up to 0.8 mm/per month were detected on a Visbreaker fractionation column. Internal examination of the column showed that the shell corrosion was confined to the vicinity of four trays situated approximately two thirds of the way up the column, with the highest rates being seen within the downcomers. Examination of the corroded areas within the downcomers indicated the presence of smooth, uniform zones of metal loss characteristic of organic acid corrosion. Further analyses of both the internal deposits and sections of shell plate taken from the areas of high corrosion indicated that organic acids were present. While the column was on-line, hydrogen flux measurements were recorded in the areas of active corrosion in order to provide an estimate of the corrosion rate in real time, to monitor the extent of active corrosion, to determine the probable cause of corrosion and to assess the effectiveness of a newly-initiated corrosion inhibitor program. The corrosion rate estimations were found to correlate well with ultrasonic thickness measurements. Hydrogen flux measurements also confirmed that the injection of a filming amine inhibitor was effective in reducing the corrosion rate of the affected area by 10-fold, despite the high temperature of up to 220°C.

Keywords: Naphthenic Acid, Visbreaker, Hydrogen Flux, Corrosion Inhibitor, TAN, Soaker Severity, High-Severity
Corrosion rates of up to 0.8 mm/per month were detected on a Visbreaker fractionation column. Internal examination of the column showed that the shell corrosion was confined to the vicinity of four trays situated approximately two thirds of the way up the column, with the highest rates being seen within the downcomers. Examination of the corroded areas within the downcomers indicated the presence of smooth, uniform zones of metal loss characteristic of organic acid corrosion. Further analyses of both the internal deposits and sections of shell plate taken from the areas of high corrosion indicated that organic acids were present. While the column was on-line, hydrogen flux measurements were recorded in the areas of active corrosion in order to provide an estimate of the corrosion rate in real time, to monitor the extent of active corrosion, to determine the probable cause of corrosion and to assess the effectiveness of a newly-initiated corrosion inhibitor program. The corrosion rate estimations were found to correlate well with ultrasonic thickness measurements. Hydrogen flux measurements also confirmed that the injection of a filming amine inhibitor was effective in reducing the corrosion rate of the affected area by 10-fold, despite the high temperature of up to 220°C.

Keywords: Naphthenic Acid, Visbreaker, Hydrogen Flux, Corrosion Inhibitor, TAN, Soaker Severity, High-Severity
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