Downtime Analysis of Flng Side-by-Side Offloading System Using Coupled Multi-Body Dynamic Simulation Methodology

ABSTRACT

The FLNG systems have been developed in several places around the world as an alternative to explore the large amount of gas in offshore fields. One of the biggest challenges in this system is the produced gas offloading due to the cargo cryogenic temperature. The offloading in side-by-side configuration has proven to be the best solution. Frequency and time domain multi-body simulators coupled with mooring, connection lines and risers, integrated with hydrodynamic coefficients have been used to analyze the dynamics behavior of these offshore structures. However, for a more accurate side-by-side simulation it is also necessary to consider the sloshing coupled to the floating body motions and the hydrodynamic forces that arise due to the water gap between the hulls. Experimental and numerical studies have shown that the liquid cargo sloshing affects significantly the motion of floating structures. Consequently, more realistic analysis can be achieved only with a coupled solution considering all these effects. This paper presents the analysis of FLNG offloading downtime considering all these aspects. The numerical results are compared to state-of-art experiments carried out in the wave basin at Numeric Offshore Tank – TPN Laboratory, using a reduced FLNG platform model with six partially filled tanks and moored side by side to a LNG carrier.

doi: 10.3850/978-981-11-0743-6 MOSS1102