Key points are not available for this paper at this time.
Abstract The Floating Production Storage and Offloading (FPSO) has a long outfitting period at the dock, which will coincide with the typhoon season. In general, the prediction of temporary mooring system safety does not consider the impact of transient stage of mooring line failure. Instead, the failed mooring line is removed from the mooring system before carrying out the simulation to analysis the mooring safety. However, ignoring the transient stage of mooring line failure will underestimate the damage caused by line failure. In this case, the safety of a temporary mooring system of a large FPSO is investigated in this paper. The failed mooring line is disconnected with the FPSO during the simulate process to achieve the simulation of transient stage. The results of FPSO and mooring system motion response in transient stage and steady state shows that the impact of mooring line failure can be considered as an impact load, which will lead to a rapid increase of the FPSO motion and mooring line tension in transient stage. The underestimated damage of line failure may cause insufficient safety redundancy when design a temporary mooring system for typhoon condition. Thus, with one line failure, the tension of the remaining line in the may exceed the tolerable limit and the mooring system may lose the station keeping ability.
Liang et al. (Sun,) studied this question.