Abstract
This paper presents results from AC corrosion tests on cathodically protected steel flowlines. An important factor, which has an increased focus in the industry, is to understand AC corrosion and how it can be mitigated. Tests have been carried out at 100 and 200 Hz, where no current transfer design limits exist, as well as at 50 Hz. The results show that the corrosion rate is independent of transfer current density (0-400 A/m2) and power frequency (0-200 Hz) on steel. On the anodes, the corrosion rate increases as a function of transfer current density (0-80 A/m2) at 50 Hz. However, the correlation is less prominent at higher frequencies (100-200 Hz). Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)