Product Summary

The Role of Hydrogen Sulfide (H2S) in Repurposing Carbon Steel Pipelines for Carbon Dioxide (CO₂) Transmission

The need for reliable transmission of carbon dioxide (CO₂) streams from various sources for carbon capture and storage (CCS) and carbon capture, utilization, and storage (CCUS) projects is growing rapidly. Repurposing existing pipelines is an attractive option in many cases over the construction of a new pipeline. However, the transmission of scCO₂ requires special design considerations rarely included in the original pipeline design. Moreover, internal scales from previous hydrogen sulfide (H2S) exposure can interact with certain CO₂ streams to create corrosive conditions. This paper explores considerations for two scenarios: a pipeline that had not previously been exposed to H₂S repurposed for a stream of CO₂ now containing H₂S and a pipeline that had been previously exposed to H₂S repurposed for use with a clean CO₂ stream without H₂S. A more detailed and complete review is provided in the PCOR Partnership's Guideline for Repurposing Existing Carbon Steel Pipelines for CCS and CCUS Projects' final report.