Integrity Management of Hydrogen Pipelines
Abstract
Existing defect assessments and repair methodologies are aligned with the T/PM/P/11 and T/PM/P/20 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 the repair techniques in the presence of high-pressure hydrogen remain uncertain. The key questions which form an outline of the project are: What are the different types of defects, we may encounter or consider injurious in the presence of hydrogen? What is the impact of hydrogen on each defect type? Have the mechanisms of failure changed for each defect type after hydrogen-natural gas blending? Will the existing repair techniques be applicable under transmission of high-pressure hydrogen and hydrogen-natural gas blends? Can we implement the defect assessment, inspection 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 assess the impact of hydrogen on the effectiveness of these inspection, assessment and mitigation technologies.
