... configuration, laydown, recovery, and transfer during installation are discussed. The steel lazy wave riser wet park stability and fatigue and transient response of wet-parked risers during flooding and dewatering are evaluated from an analytical aspect. The riser wet park stability and fatigue, consist...

... Abstract Obtaining a realistic prediction of the fatigue damage of pipelines employed in the subsea industry is vital for safe operations, as they are permanently subjected to wind-sea waves, swell and marine currents. Considering pipeline fatigue damage due to vortex-induced vibration (VIV...

... life of as-built carcass and investigates sensitivities to carcass pitch and barrier intrusion. For this purpose, a novel approach to carcass SN curves is presented. The use of these SN curves in the finite element simulations for the service life estimation improves the fatigue life prediction...

... Abstract Three inch bolts have been fatigue tested to quantify the fatigue strength in air environment and seawater with cathodic protection. The motivation behind the laboratory test project was to justify the use of cathodic protection against corrosion for bolts used in subsea systems...

... of the risers as documented through the integrity management program. The fitness for service assessment of Steel catenary risers (SCRs) consists typically of assessment of strength, S-N fatigue from all contributing sources, interference with other risers, umbilicals, or objects, flow assurance, cathodic...

... offshore turbine substructure experiences higher fatigue load than conventional offshore platform. A reliable fatigue assessment is required to achieve the structural safety and integrity of the floating wind turbine platform. Accordingly, class societies recommend fully coupled time domain analysis...

... Abstract The recommended practice DNV-RP-C203 Fatigue Design of Offshore Steel Structures has been regularly revised since it was first published in 1998. The reasons for these revisions are new data and new learnings from design and in-service experience from installed structures. The standard...

... Abstract Through-the-thickness stress distribution in a tubular member has a profound effect on the fatigue behavior of tubular joints commonly found in steel offshore structures. This stress distribution can be characterized by the degree of bending (DoB). Although multi-planar joints...

... Abstract For an installed submarine power cable, fatigue is one of the main causes of failure. For static power cables there are cases such as free spans, spans between touch-down point (TDP) and J/I-Tube bell mouth and repair/sea joint procedures that may lead to failure due to fatigue...

... Abstract This paper presents a method of assessing fatigue life due to slamming on the structural components inside drillship moonpools with a recess. The effect of free surface deformation in the moonpool, the resulting slamming pressure on the moonpool’s bulkheads, and the resulting stresses...

... Abstract The effect of out-of-plane bending (OPB) on the fatigue life of moorings has been the focus of extensive study over the last 15 years. Classification societies now require it to be considered in mooring chain fatigue life calculations. A fatigue analysis of the mooring for a North Sea...

... Abstract Fatigue life calculation of slender marine structures, such as risers and mooring lines, usually requires a high computational cost. This cost comes from using finite element-based numerical models to predict the stress response of such structures under the action of many fatigue...

... Abstract Thermal cut edges can be found in most maritime structures, e.g. in window openings or hatch corners on ships. It is very common to treat free plate edges by grinding or sandblasting due to fatigue and coating requirements. The aim of this study is to review the fatigue behavior...

... tension and concern over fatigue performance. This paper aims to search for the global optimal solution of a riser system through the application of genetic algorithm (GA) and finite element analysis. The process method will, in turn, automate the design process, with the implementation of an optimisation...

... Abstract Large bolts are used in applications which are subjected to fatigue loads, such as the M72 bolts used in ring flanges of wind turbine towers. Pretension is used as a means of protecting bolts against fatigue loading. Design standards require particular levels of pretension...

... in the analyses; various cases with different riser design margins are investigated. steel lazy wave riser (SLWR) fatigue flowline steel catenary riser (SCR) flowline walking Proceedings of the ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering OMAE2022 June 5-10, 2022...

... Abstract DNV is currently running a Joint Industry Project, “NorMoor JIP”, which is now approaching the end of phase 3. In this phase the fatigue limit state (FLS) of mooring line studless chains for permanent units has got the main attention. Phases 1 and 2 covered the ultimate (ULS...

... to regular tank inspections intervals as an LNG carrier. The challenge is how to assess this equivalence. A definition of the reference vessel and trade is required. This paper addresses a new proposed methodology to quantify the relative pump tower fatigue. It is built up of several steps...

... load value (ΔMo) determined by water depth and operational mode. Finally, to outline quantified advice on maximum and cyclic load reduction potential that can be extracted from the underlying studies. NORSOK wellheads templates drilling loads fatigue Proceedings of the ASME 2022 41st...

... Abstract Steel wire ropes can be used as mooring lines for Floating Offshore Wind Turbines. Swell induces tension and bending in the line. Investigating the effects of combined loads on rope lifetime is necessary. In these cases, fretting-fatigue damage is considered to be one of the main...