PUBLICATIONS AND VIDEOS

SUMMARY

Carbon Capture and Storage (CCS) requires very large quantities of impure CO₂ to be captured, transported, and injected deep underground. The CO₂ systems will likely have Major Accident Hazard (MAH) potential due to a combination of the mass of CO₂ that could be released during an accidental leak and the impact if the released CO2 is inhaled above a concentration of around 5%.

Of particular concern are pipelines carrying liquid phase CO₂ located onshore or near-shore as these pipelines will have a CO₂ inventory of many tens of thousands of tonnes and if there was a loss of containment would threaten life for a considerable distance.

It is therefore vital that those responsible for implementing and regulating CCS are fully aware of the CO₂'s MAH potential so that CO₂ systems are located, designed, operated and maintained to reduce the risks to people to an acceptably low level.

This presentation raises awareness of the properties and behaviours of CCS CO₂ and highlight how they could cause or contribute to a MAH event. It draws on the considerable experience and knowledge gained through various CO₂ Joint Industry Projects (JIPs) that DNV has delivered to support the global roll out of CCS, JIPs such as CO2PIPETRANS and CO2RISKMAN.

The presentation includes information on:

• CCS & CO₂ basics;
• Inhalation effects;
• Integrity threats:
  • Material incompatibility;
  • Internal corrosion;
  • Low temperatures;
  • Solid CO₂ formation;
  • Thermal expansion;
• Mixture phase behaviour;
• Propagating pipeline cracks;
• Hydrate formation;
• CO₂ BLEVE;
• Release modelling & topography effects;
• MAH Regulatory oversight.