How CO₂ flows through restrictions
Model to predict running-ductile fractures in CO₂ pipelines
We are working to improve our ability to predict running-ductile fractures in CO2 pipelines. The work has progressed along three main lines of research.
The first is to improve methods for describing the steel and crack behaviour in a finite-element modelling framework, including the consistent calibration of model parameters based on limited input from material tests. The second line of research is to describe the pressure load on the pipe walls from the escaping CO2, properly taking non-equilibrium effects into account (see also the previous paragraph). The third line of research is to “distil” the knowledge obtained into an engineering tool.
We have previously assessed pipeline designs for the Northern Lights project. This year we wrote an update of this work together with Equinor, which will be presented at the TFAP Conference in March 2022.
Educating the next generation of CCS scientists
This year, we co-supervised a master’s candidate from the Department of Structural Engineering at NTNU on modelling ductile fracture in steel structures. Our two PhD candidates who work on the topic of fracture mechanics related to fracture-propagation control in pipes, and on the topic of depressurization of CO₂ in pipes, have both successfully completed their first year. Both candidates are co-supervised by NTNU and SINTEF.