<p>Korea has led the global market in the offshore drilling ship construction sector, led by its three major shipbuilders. However, the country is currently facing challenges due to low oil prices and the lack of core technologies, such as deep-sea drilling systems. Conventional gravity separation systems are used for offshore oil and gas resource development, but these systems suffer from numerous limitations, including slow processing speeds, high costs, large installation space, and difficulties in installing high-pressure tanks in deep-sea environments. Therefore, there is a growing demand for integrated inline water-oil-gas three-phase separation technology. Furthermore, crude oil and natural gas production areas are expanding to deep-sea and extreme regions like the Arctic, driving demand for materials with improved properties for the development and transportation of new energy resources, such as oil sands and shale gas. This study analyzes pipeline materials used in subsea separation system components and aims to develop technology for applying these materials to high-efficiency inline subsea separation systems.</p>