This paper describes the feasibility of topside float-over installation in Brazilian sea water. Float-over installation, which is the method to install a topside onto a substructure, such as jacket or floating platforms, using a transportation barge or vessel, is becoming more common as crane vessel lifting capacity is limited and not available in certain areas.The main benefit of float-over compared to multi-module lifting installation is relatively short offshore hook-up and commissioning time, reducing offshore exposure hours and cost. The float-over installation method is increasingly becoming the installation method of choice in both mild and harsh environments as topside weight grows. However, the float-over method has never been used in Brazilian sea water mainly due to the unique weather characteristics typically represented by swell.In this study, weather characteristics in several project sites worldwide are analyzed and several workability analyses are performed based on estimated weather limits that are calculated from extensive float-over analyses. The risks and costs related to a float-over installation operation will be a part of an important factor determining topside fabrication philosophy.From this study, the float-over method in Brazilian sea water is found to be feasible when using specific supporting structure design such as surge/sway fenders, Leg Mating Unit/Deck Support Units (LMU/DSU) and mooring system. Although workability in the Brazilian sea water is relatively lower than other regions due to swell conditions, there is plenty of room to improve the workability by introducing float-over systems designed specifically for swell dominant area.
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