Quasi-Static and dynamic monitoring of SPM

The Single Point Mooring system moored to ship tanker nearby the production platform Vega A, operating from 1988 in Sicily channel. This paper involves the monitoring of yoke, the collection and statistical interpretation of structural response data, recorded from October 2009. Strain optical fiber sensors and inclinometers are installed to know the behavior of the articulated structures: column-yoke-vessel, named FSO Leonis. The optical fiber data are processed, the temperature compensation of the strain data are performed in order to determine the forces on the column. The inclinometers sensor data are analyzed to identify the dynamic response of the SPM system and to count the number of fatigue cycles. The acquired data are computed in order to establish their representativeness in relation to the design assumptions and to allow the control of the column, yoke itself and the ship structures.