Optimization of CT Spar Platform and Its Mooring and Riser System
Taking the CT Spar platform and its mooring and riser system as the research object,it was identified that the number of platform heave plates,tensioned mooring line pretension,the position and buoyancy of floaters on the steel catenary riser are the key parameters in the design of the CT Spar platform mooring riser system.By means of frequency domain analysis,time domain coupling analysis based on SESAM,these key parameters were analyzed and optimized with the system motion re-sponse and force as indicators.The numerical results showed that the parameter design of a Spar platform with 3 heave plates from 4,mooring line pretension of 1 800 kN and a floater of 3 600 kN installed at 60%of the top of the riser is the preferred scheme to adapt to the complex dynamic environment of wind wave current at 1 500 m depth.This scheme was analyzed under extreme dynamic condition and partial damage of the platform system condition by time domain coupling analysis,finding that it can also meet the requirements of relevant safety specifications for oil platforms and significantly improve the stress state of mooring lines and risers.
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