Benefits: Targeted anti-corrosion design, intrinsic anti-corrosion function; It has small stiffness, small bending radius, good flexibility, and adapts to changes in seabed landform; Long continuous length, few installation joints, no need to install expansion bends, short construction period, long continuous length of a single root, simple offshore construction, low risk and low cost; Recyclable, reusable, and pollution-free. Subversive replacement of steel pipes, saving the overall project cost