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With real time data, a more accurate estimation on fatigue performance of riser can be achieved, which could enable the service life extension without compromising the design safety factors.Ī special software tool has been developed to calculate the real time fatigue damage of flexible tensile wires. Compared to the typical input data/assumptions made in predictive analysis, these records are more precisely and directly related to the actual fatigue damage accumulation. Furthermore, pipe internal operating conditions like pressure and temperature are usually recorded onboard. Many platforms or vessels already have real time monitoring of motions in multiple degrees of freedom and wave/current data.
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In combination, these inheriated conservatism permits the feasibility of service life extension of the flexible riser systems. In addition to the conservatism inherited in the product design methodology and API safety factor 10 for fatigue estimation, the input data may also contain some additional conservatism compared to actual operational conditions as these were estimated/projected from limited time-span of observations or predicted purely from numerical modelling.
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Metocean data, riser properties, vessel or platform RAO data are typical inputs for the fatigue analysis. To estimate the fatigue damage, global and local analyses are performed inhouse with inputs from operators. Fatigue life of flexible risers is a critical design factor in offshore riser system design.