Integrity assessment of supercritical CO2 transport pipelines

Abstract

With global warming, carbon capture and storage (CCS) technology is attracting increasing interest as a major technology for carbon peaking and carbon neutrality. Pipeline transportation, as one of the most cost-effective modes of transportation, has become the major transport method for large-scale long-distance supercritical carbon dioxide (CO2) transportation. Because corrosion is a major factor affecting pipeline operation, this paper aims to assess the integrity of supercritical CO2 pipelines. A finite element model of the pipeline with corrosion defects is created based on the corrosion morphology of the supercritical CO2 pipeline, and sensitivity analysis of the parameters affecting the burst pressure of the supercritical CO2 pipeline is carried out. Based on finite element analysis and burst pressure model of the intact pipeline, a nonlinear fitting method is used to establish the burst pressure equation of supercritical CO2 pipelines with corrosion defects. Compared to experimental data, the predictive equation has a high accuracy for the burst pressure of X60-X80 steel pipelines. It can serve as a reference for the design and integrity assessment of supercritical CO2 pipelines.