Within the project COORAL (German acronym for "CO
2 purity for capture and storage") studies on pipeline steels exposed to circulating supercritical impure CO
2 have been carried out. For this purpose, a loop consisting of compressors, flow meter and two autoclaves was constructed. In order to simulate the real conditions in pipelines, impurities such as H
2O, CO, SO
2 and O
2 were added to the CO
2 stream before compression. Exposure experiments were carried out with steel specimens placed in the autoclaves. Carbon steel L360NB, pure iron X20Cr13, X46Cr13, X2CrMnNiN22-5-2 and alloy 31 have been exposed to circulating (flow rate 4 L/min) supercritical impure CO
2 for one week at 60 °C and 10 MPa Surface analysis and weight loss experiments in order to determine the corrosion products and the corrosion rates showed that the impurities cause corrosion problems. Slight general corrosion by L360NB and soft iron was observed. The initiation of pitting corrosion was observed at the surfaces of the materials X20Cr13, X46Cr13, X2CrMnNiN22-5-2. No visible signs of corrosion have been observed on alloy 31.
Number of Pages
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.