This Engineering Doctorate project aimed to study the effects of varying flowrates on the flow dynamics of carbon dioxide within a pipeline. The researched utilised the software gCCS to simulate three different transport system. The first system looked at the effects of transporting pure carbon dioxide in both the supercritical phase and the sub-cooled liquid phase. The outputs from the model showed that when the inlet flowrate is decreased, the outlet flowrate responds in three distinct phases. The second system compared the effects of three different impurities; hydrogen, nitrogen and oxygen, on the flow response when the inlet flowrate is decreased. It was found that all three impurities caused an increase in the offset between the inlet and outlet flowrate. The third system looked at how multiple sources of carbon dioxide effect the flowrate within the main trunk pipeline. It was found that multiple sources of carbon dioxide do not affect the flow of CO2 within the pipeline beyond that of the base case. The final part of the research compared data from the Shell QUEST pipeline to the model. This showed the model was able to predict the flowrate and pressure of the carbon dioxide with good accuracy.