The tanker FSO Leonis is moored near the offshore platform Vega A, to a steel column with circular section, 130 meters high and 10 meters in diameter. The system is installed in 1988 in the Sicilian Channel, and the connection is via a bridge structure with welded steel sections that make up the system SPM (Single Point Mooring). The structural system in steel box girders and column, with its cylindrical hinges, is calls-to the actions of the sea that induce cyclic stresses and fatigue. The paper presents a study on a possible improvement of the monitoring system installed in the structures that connecting the ship to the column, the monitoring, installed in October 2009, is composed of strain gauges sensors, in fiber optic and inclinometers. The research concerns the method of collecting and interpreting statistical data, to determine the structural behavior under the action of the wind and sea. Through the elaboration of monitored data it is possible to identify the dynamic response of the system SPM, counting the stress and number of fatigue cycles and conduct the verification in welded sections of steel box girders (yoke), column and the hinge joints. The results allowed us to evaluate the design assumptions and define a program of inspection and maintenance of steel structures of the offshore SPM system.
Study of SPM monitoring improvement / Castelli,Paolo; Rizzo,Michele; Spadaccini, Ostilio; Vignoli, Andrea;. - ELETTRONICO. - (2017), pp. 0-0. (Intervento presentato al convegno SMAR 2017 tenutosi a Zurigo, Svizzera nel 13-15 settembre 2017).
Study of SPM monitoring improvement
SPADACCINI, OSTILIO;VIGNOLI, ANDREA
2017
Abstract
The tanker FSO Leonis is moored near the offshore platform Vega A, to a steel column with circular section, 130 meters high and 10 meters in diameter. The system is installed in 1988 in the Sicilian Channel, and the connection is via a bridge structure with welded steel sections that make up the system SPM (Single Point Mooring). The structural system in steel box girders and column, with its cylindrical hinges, is calls-to the actions of the sea that induce cyclic stresses and fatigue. The paper presents a study on a possible improvement of the monitoring system installed in the structures that connecting the ship to the column, the monitoring, installed in October 2009, is composed of strain gauges sensors, in fiber optic and inclinometers. The research concerns the method of collecting and interpreting statistical data, to determine the structural behavior under the action of the wind and sea. Through the elaboration of monitored data it is possible to identify the dynamic response of the system SPM, counting the stress and number of fatigue cycles and conduct the verification in welded sections of steel box girders (yoke), column and the hinge joints. The results allowed us to evaluate the design assumptions and define a program of inspection and maintenance of steel structures of the offshore SPM system.File | Dimensione | Formato | |
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