Estimation of Corrosion Rate for Ruptured Subsea Pipeline With Electrochemical Measurement

Abstract

Abstract The effects of the DO concentration and salinity on corrosion behaviour of carbon steel were investigated by electrochemical measurements to estimate corrosion rate simulating ruptured subsea pipeline. Corrosion rates decreased as the DO concentration decreased. When the salinity increases, the solubility of oxygen in the water decreases. Therefore, corrosion rates of higher salinity conditions were lower than that of lower salinity conditions. The corrosion rate significantly increased due to the presence of CO2. Not only repair but also replacement of pipeline should be considered in the case the pipeline is ruptured at the section with high corrosion risk.