Carbon Capture and Storage (CCS) is technology in mitigating climate change by capturing CO2 emissions from industrial processes.

The process involves transporting CO2 through pipelines to underground geological formations, often depleted oil and gas reservoirs or saline aquifers, to provide secure storage for the CO2.

Eni UK Liverpool Bay Asset have been selected as a suitable system for CCUS. This project covers the design and installation of new pipeline infrastructure as well as the repurposing of existing LBA pipelines. CO2 will be transported from the emitters and delivered to the infield platforms via the onshore and offshore pipelines and will be injected into the existing reservoirs.

Repurposing existing pipelines requires careful consideration of safety, capacity, and compatibility with current operations. Collaboration between industries, government, and regulators is essential to ensure proper infrastructure usage, emission reduction goals, and regulatory compliance.

Introducing CO2 into a pipeline network poses several threats to carbon steel pipelines, especially when CO2 is present including:

• Water Content
• Existing Debris
• Corrosion
• Subsequent Corrosion Products
• Pitting Corrosion

The 2020/2023 Inline Inspection (ILI) programme have identified residual solid debris in the six pipelines that will be repurposed. Residual debris will allow local water hold-up in the pipeline. It is critical that all residual debris and water must be removed. A suitable pipeline cleaning and drying technique must achieve a very low dew point. The e-Splora (proprietary Eni technology) and other available techniques will be utilised to evaluate the quality of pipeline cleanliness for CO2 service.

Pipeline operators use various strategies, including monitoring and maintenance programs to detect and address corrosion and other damage during the design life. Magnetic flux leakage (MFL) inspection can be utilised to mitigate these threats. This paper considers MFL technology use, supporting repurposing and future integrity, monitoring and maintenance of the new and existing pipelines.