As part of the global imperative to decarbonise fuel, repurposing existing natural gas pipeline infrastructure for hydrogen is considered an essential and expedient pathway, particularly for industrial heat and energy applications. However, this transition presents technical and operational challenges, requiring a structured approach to assess pipeline feasibility. This paper presents a methodology developed to screen pipelines for hydrogen repurposing through a structured process. The methodology evaluates key factors such as coating condition, material test certificate availability, welding records, encroachment, burial depth, block valve suitability, and environmental considerations.

To demonstrate the application of this screening methodology, two case studies are outlined: Case A examines an older pipeline system with limited material records and legacy design considerations, while Case B focuses on a newer system built to more modern standards. The results of these assessments highlight the key challenges, risks, and mitigation strategies identified through the screening process. Insights from this work provide a structured approach for pipeline operators and stakeholders to make informed decisions on hydrogen conversion, ensuring safety, reliability, and efficiency in the transition to hydrogen-based energy systems.