This project will provide the tools and information necessary for pipeline engineers to select appropriate materials and operating conditions to control corrosion, stress corrosion cracking and fracture propagation in pipelines and associated equipment carrying supercritical CO2 from the capture processes likely to be realised in the near and long term future. However, in order to be able to achieve this overall aim, fundamental scientific research is required to provide the data and predictive models necessary to produce accurate and validated predictions.
The first tasks in the project are to determine the expected ranges of compositional variation in the CO2 streams. The experimental data will be used to address another gap in the existing knowledge on supercritical CO2 process streams, the prediction of the phase behaviour and thermodynamic properties using existing equations of state. The experimental data will be compared with existing equations of states and new models developed and provided to the hydraulic and fracture propagation models that will be used in the interconnected Work Packages. The remaining Work Packages involve the specification of the pipeline and associated equipment materials to determine the conditions under which corrosion, stress corrosion cracking and fracture propagation will occur. Once the constituents in the CO2 stream have been selected, experiments investigating corrosion, stress cracking and fracture propagation will be conducted.