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11328 Top of the Line Corrosion Under Low Temperature and high COndensation Rate Conditions

Product Number: 51300-11328-SG
ISBN: 2011 11328 CP
Author: Huimin Qin, Lining Xu, Wei Chang, Minxu Lu, Lei Zhang
Publication Date: 2011
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In wet gas transportation pipelines, condensation of water from warm and humid gas on cold pipeline walls plays a significant role in top of the line (TOL) corrosion. The CO2 TOL corrosion behavior of carbon steel under low temperature range and high condensation rate conditions was investigated in autoclaves especially equipped to provoke water condensation on steel samples, hence simulating the subsea wet gas pipeline environment. One side of the carbon steel samples was exposed to water-saturated CO2 in the temperature range of 20oC to 45oC at 0.8MPa, the other side was cooled to as low as 5 oC which caused a relatively high condensation rate. The corrosion rate was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed using surface analytical techniques such as Scanning Electron Microscope(SEM) and Energy Dispersive Spectrum(EDS). In addition, considerations regarding the impact of the condensation process on the corrosion products were discussed.

Keywords: TOL corrosion, carbon steel, high condensation rate, low temperature
In wet gas transportation pipelines, condensation of water from warm and humid gas on cold pipeline walls plays a significant role in top of the line (TOL) corrosion. The CO2 TOL corrosion behavior of carbon steel under low temperature range and high condensation rate conditions was investigated in autoclaves especially equipped to provoke water condensation on steel samples, hence simulating the subsea wet gas pipeline environment. One side of the carbon steel samples was exposed to water-saturated CO2 in the temperature range of 20oC to 45oC at 0.8MPa, the other side was cooled to as low as 5 oC which caused a relatively high condensation rate. The corrosion rate was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed using surface analytical techniques such as Scanning Electron Microscope(SEM) and Energy Dispersive Spectrum(EDS). In addition, considerations regarding the impact of the condensation process on the corrosion products were discussed.

Keywords: TOL corrosion, carbon steel, high condensation rate, low temperature
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