The energy transition is becoming a reality across the world, driven by the need to reduce greenhouse gas emissions and reduce dependence on fossil energy sources that are gradually depleting. Countries around the world in general and Vietnam in particular are accelerating the energy transition, seeking and developing green/clean energy sources to replace fossil fuels, especially the use of Hydrogen in the national energy system. To meet this goal, PV GAS has launched initiatives to evaluate the ability of transporting and distributing pure hydrogen or Natural Gas / hydrogen blends by the existing PV GAS infrastructure. The infrastructure covers offshore natural gas pipelines, onshore gas process plants (GPP), sales gas distribution systems. Led by state-of the art industry knowledge and expertise, the study focused on the following key axes: • Local regional and market interest in deploying hydrogen at an industrial scale – what are the drivers and the challenges? • Defining of the limits of mixing Hydrogen with natural gas transported through existing gas pipelines to address system capacity and design limits, and energy efficiency requirements • Integrity evaluation of the ability to transport Hydrogen by the existing pipeline system • Evaluation of the ability to transport Hydrogen by existing Gas Process Plant, including o Equipment structural compatibility o Impact safety measures - Fire and explosion, site layout, flare, gas and fire detection This paper summarises the key study findings and challenges with the aim to provide a road map to deploy safely hydrogen; it is anticipated to support the industry by providing a benchmark for repurposing feasibility in South-East Asia.