Increased tolerance levels for impurities in CO2 compositions for pipeline transport will give considerable value to CCS projects. Increasing the allowable H2S limits may impose a risk for sulfide stress cracking (SSC) and corrosion. ISO 15156 defines the testing requirements for SSC for oil and gas production, however, CCS applications are not considered in the standard and need to be fully understood in order to provide the right requirements. This work presents preliminary results from an ongoing project with the objective to establish the allowable H2S limit in pipelines transporting CO2 and to establish whether it is possible to represent dense phase SSC behavior by testing in ambient conditions. Autoclave four-point bending test results and simulations are presented and further used to discuss the implications of correlating the dense phase conditions to ambient conditions.