ABSTRACT
One of the most frequently adopted solutions for the exploitation of oil fields in Brazilian offshore basins is the Floating Production Storage and Offloading system (FPSO). This is a conventional tanker converted to operate as a platform to receive the risers (ducts bringing hydrocarbons from the reservoir) and store the production
temporarily. Environmental forces tend to displace the vessel from the desired position, and therefore station-keeping devices are required. A common solution is an anchoring system called the Differentiated Compliant Anchoring System (DICAS), in which mooring lines connect the vessel to anchors on the seabed. Pre-tensions of the lines are arranged in such way that the vessel has some freedom to adjust itself to the predominant direction of the incoming weather.
