Vallourec, a leading provider of premium seamless tubular solutions, has achieved the official qualification of its hydrogen storage solution called Delphy, by DNV. Delphy is a vertical gaseous hydrogen storage system that can store between 1 to 100 tons of hydrogen under maximum safety conditions. Its unique design allows it to extend up to 100 meters underground, making it suitable for complex industrial environments. The solution targets green hydrogen producers and various industrial sectors like synthetic fuel producers, green ammonia producers, steelmakers, and refineries. Delphy is the culmination of Vallourec's expertise and experience in seamless tubes and connections, known for their tightness and corrosion resistance. Launched in 2022, the project involved significant research and development efforts, with around thirty specialists focusing on precision threading, heat treatment, and non-destructive testing. Following the successful demonstration in December 2023, Delphy has undergone rigorous testing and validation processes, leading to its recent qualification. The company has already secured Memorandums of Understanding (MoUs) with key industry players like H2V and NextChem Tech for green hydrogen and ammonia projects. Currently, discussions are ongoing for approximately fifty projects globally, indicating a substantial revenue potential of €2 billion. The rise in demand for hydrogen storage infrastructure is attributed to the increasing need to accommodate the intermittent nature of green hydrogen production, driven by European regulations and the French hydrogen strategy. Philippe Guillemot, Chairman and CEO of Vallourec Group, emphasized the significance of Delphy's qualification, highlighting the company's commitment to sustainable energy solutions and global decarbonization efforts. DNV, the validating authority, praised Delphy as a milestone in safe and scalable hydrogen infrastructure, essential for meeting the growing demand for hydrogen in various industries. The article reflects a positive sentiment towards Vallourec's innovative hydrogen storage solution and its prospects in the evolving energy landscape.