Nonstationary multidimensional Gaidai reliability method for environmentally safe marine riser design, accounting for memory effects

Energy transportation and storage systems are becoming increasingly economically viable as maritime and offshore renewable energy generation technologies advance, thereby diversifying both hydrocarbon and green energy sources. Offshore Compressed Air Energy Storage (OCAES) comprises flexible energy storage and transportation technologies. It is frequently utilized by Floating Production, Storage and Offloading (FPSO) units, offshore wind farms, and marine green renewable energy systems. Currently, marine risers being widely used to connect floating platforms to subsea equipment during offshore operations. Therefore, understanding the dynamic characteristics of marine risers is critical to ensure the overall operational safety and stability of various offshore OCAES systems. Due to frequent use in the offshore industrial sector, marine risers are often susceptible to excessive dynamic environmental stresses. For various offshore installations, an accurate assessment of the dynamic response of deep-sea risers to subsurface currents is essential, given that VIV are critical to design and operational safety. This case study examined the effects of hydrodynamic sea-current loads on marine risers under actual in situ environmental conditions, using an accurate experimental dataset. This case study demonstrated that, under excessive sea/ocean wave/current loads, it is possible to accurately assess the risk of damage or failure for the riser system.