The hydrodynamic performance of a novel float-over installation

In this paper, the concept and design philosophies are presented. The performance of the system during its consequential installation stages is discussed with regard to the stability, motions and strength aspects. The main stages of FFO installation, namely, transportation, lowering of the group of floaters, connecting them to the deck, separation of the deck from the transportation barge and mating of the deck with jacket legs, are presented. In each step, stability and motions are determined at the prevailing sea state. Based on the results of the motion analysis, the impact and internal forces at the deck are computed and evaluated according to the industry codes and standards. A case study for a deck that is to be installed by either heavy lifting or float-over is included, to indicate the suitable sea state for installation and the required stiffening for the deck.