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51316-7740-Corrosion of Carbon Steel in Water Equilibriated with Liquid and Supercritical CO2

Picture for Corrosion of Carbon Steel in Water Equilibriated with Liquid and Supercritical CO2
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Product Number: 51316-7740-SG
ISBN: 7740 2016 CP
Author: Bjørn Morland
Publication Date: 2016
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Carbon Capture Utilisation and Storage (CCUS) requires pipeline transport of large quantities of liquid and supercritical CO2. Free water cannot be accepted in the pipeline and accidental ingress of water has to be removed immediately. The acceptable response time after water contamination will be system specific and depend on the corrosion rate and corrosion allowance. Presently the corrosion rate in a pipeline suffering from accidental water ingress cannot be estimated accurately due to lack of corrosion data at high CO2 partial pressure.The present paper discusses the results from flow loop experiments where carbon steel specimens were exposed to water equilibrated with liquid gaseous and supercritical CO2. The experiments were carried out at 25 °C flow velocity 0.65 m/s and CO2 pressures ranging from 1 to 10 MPa. The corrosion rates were determined from electrochemical measurement iron count and weight loss. The corrosion rate increased with increasing CO2 pressure up to 2 MPa (13 mm/y) at higher pressures (4 to 10 MPa) the corrosion rate was slightly lower (9-12mm/y) and independent of CO2 pressure. No protective film was formed under these conditions.
Carbon Capture Utilisation and Storage (CCUS) requires pipeline transport of large quantities of liquid and supercritical CO2. Free water cannot be accepted in the pipeline and accidental ingress of water has to be removed immediately. The acceptable response time after water contamination will be system specific and depend on the corrosion rate and corrosion allowance. Presently the corrosion rate in a pipeline suffering from accidental water ingress cannot be estimated accurately due to lack of corrosion data at high CO2 partial pressure.The present paper discusses the results from flow loop experiments where carbon steel specimens were exposed to water equilibrated with liquid gaseous and supercritical CO2. The experiments were carried out at 25 °C flow velocity 0.65 m/s and CO2 pressures ranging from 1 to 10 MPa. The corrosion rates were determined from electrochemical measurement iron count and weight loss. The corrosion rate increased with increasing CO2 pressure up to 2 MPa (13 mm/y) at higher pressures (4 to 10 MPa) the corrosion rate was slightly lower (9-12mm/y) and independent of CO2 pressure. No protective film was formed under these conditions.
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