PETROBRAS has developed a new mooring system for production and storage tankers moored in offshore Brazil. The system is denoted DICAS (Differentiated Compliance Anchoring System), and is basically a spread mooring system with different stiffness at the bow and stern of the ship. This difference in stiffness allows the ship to weather vane partially under environmental conditions. Due to the characteristics of this system, the design has to take into account the varying direction of the weather and the best lay-out of the production risers and mooring lines. Since DICAS is a partial weather vaning system, it makes the production swivels and turrets unnecessary. Therefore, the cost for production systems based on existing tankers will be drastically reduced, so it shall be very useful for low production and marginal fields in mild environments. This paper presents some results from experiments and simulations, and discussions on the design criteria for such systems. Important factors to be included in the design are the damping coefficients, namely the wave drift damping, the mooring line damping and the linear and quadratic viscous damping. The effect of interaction between current and waves is also important.


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    Title :

    DICAS - a new mooring concept for FPSO's


    Contributors:
    Kaster, F. (author) / Barros, M. (author) / Rossi, R. (author) / Masetti, I. (author) / Falkenberg, E. (author) / Karlsen, S. (author) / Waclawek, I. (author)


    Publication date :

    1997


    Size :

    Seiten, 13 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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