Abstract: Amid the rising demand for hydrogen energy storage and transportation and the underdeveloped infrastructure in China, utilizing natural gas pipelines for hydrogen-blended transport has emerged as an efficient solution, with the option to repurpose short-distance natural gas pipelines for pure hydrogen transport. Accordingly, domestic design specifications for hydrogen and natural gas pipelines—including GB 50251—2015, SY/T 7820—2024, and T/CSPSTC 103—2022—were compared across four aspects: pipe material selection, wall thickness design, construction technology, and safety requirements, to assess the adaptability of repurposing natural gas pipelines for hydrogen transport. The results indicate that: ① Due to the unique properties of hydrogen, material selection for hydrogen pipelines is strictly regulated. ② Relevant specifications not only set upper limits for chemical components such as carbon, sulfur, and phosphorus in steel pipes and fittings for hydrogen transport, but also specify requirements for valve stem materials, sealing packings, flanges, and gaskets, necessitating special evaluation of pipe and valve suitability. ③ Differences in design specifications often require a reduction in design pressure when repurposing pipelines for hydrogen transport. ④ To further enhance the domestic hydrogen pipeline standard system, additional research is needed on commissioning and operational safety control, leakage and explosion safety technologies, and the applicability evaluation and modification of equipment and instruments. In conclusion, the research offers guidance for engineering applications of repurposing natural gas pipelines for hydrogen transport.