Monitoring of a single point mooring in the VEGA field

In Sicily channel is operating from 1988 the offshore platform VEGA; in addition, the ship tanker Leonis is moored nearby the platform and coupled to a system tower-tanker. VEGA is the largest off-shore oil platform built in Italy. Oil production in Sicily began with the discovery of deposits in the areas of Ragusa in 1950 and Gela in 1956. The offshore exploration, from 1959, found some minor deposits, but only in the period 1978-80 through the acquisition of 3D seismic data the interpretation of the results and identification of the structure of Vega and its extension became possible. This work involves the collection and statistical interpretation of structural response data recorded, from October 2009 so far, on the link column-yoke-vessel FSO. The acquired data are processed on the ship in order to establish their representativeness in relation to the structural control of the yoke itself and the ship Leonis. The present work presents the results of data processing provided by the monitoring system, which performs the spectral analysis and dynamic identifications. These results are then compared with data from the project in accordance with the storms that have affected the structural system.