Integrity Management of Gaseous Carbon Dioxide Pipelines
Abstract
Existing defect assessments and repair methodologies are aligned with the P/11, P/20 and PM/DAM1 management procedures and are adopted to inspect, assess and repair the pipelines for defects and take suitable measures to reduce them. However, the scope and applicability of these assessment and repair methodologies in the presence of gaseous phase carbon dioxide remain uncertain. The key challenges which the project aims to address are: Will existing repair techniques such as epoxy shell, welded shells, composite wraps, gouge dressing etc. be suitable for transmission of gaseous phase carbon dioxide? What are the different defects we may encounter or consider hazardous in the presence of carbon dioxide? What are the impacts of carbon dioxide on each defect type? And how much does water/corrosion exacerbate this? Have the mechanisms of failure for each defect type changed after introducing carbon dioxide? Can we implement the assessment and repair methodologies safely? Are the techniques safe and suitable for the pipeline operations and maintenance teams? The project seeks to answer the above in addition to understanding the types and extent of repairs across the NTS and review the impact of carbon dioxide on the effectiveness of these inspection, assessment and mitigation technologies.
