Experiments and modeling of two-phase transient flow during CO2 pipeline depressurization

Abstract

Accurate knowledge and models of transient and two-phase CO2 behaviour are important for safe and cost efficient design of CO2 pipel ines. A CO2 pipeline test rig has been successfully utilized for establishing the operation window and specifications of CO2 pipelines for verifying a theoretical two -phase transient flow model for depressurization and other transient operation of CO2 pipe lines. It is concluded that the model is experimentally verified within its validity rang. A second rig for accurate measurement of heat transfer out of CO2 pipelines has recently been started up.