Prediction Model of Top-of-the-line CO2 Corrosion in Gas Pipeline

A model was established to predict the top-of-the-line corrosion rate (TLC) in CO2 environment. The model consists of three modules: the condensation prediction, calculation for the water chemistry of condensed droplets, De Waard CO2 corrosion model. These modules take into account the three main processes in the CO2 corrosion phenomenon at the top of the pipeline. Then these three modules are associated with each other by ferrous material balance in order to obtain the final predicted TLC. The model prediction was validated by the condensation autoclave and wet gas flow loop experimental results.