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The cargo system of FPSO units is of particular interest due to its rigorous operational requirements. In addition to structural and static stability requirements, the offloading operation of FPSO units should satisfy rigorous requirements related to the dynamic behavior of the vessel. In this sense, the cargo offloading process of FPSO units represents a critical aspect related to its design and operation. Unfortunately, due to the great computation effort usually required to analyze complex pipe networks, it is not a common practice to perform the analysis of the cargo system functioning at the design stage. This paper presents the analysis of the offloading operation of a typical FPSO unit. The analysis comprehends the simulation of the operation of the cargo system during the offloading process. The author adopted a new method to the analysis of pipe networks that seems to be more adequate for the analysis of fully branched systems. The results obtained indicate that the simulation of the cargo system operation is a useful tool for the analysis of the offloading process of FPSO units both at the design stage and during site operation.

ResumoAtualmente, a soldagem por extrusão de peças semi-acabadas (chapas) em PEAD tem se mostrado como uma solução atraente para a fabricação de pequenas embarcações de serviço. Neste sentido, a qualidade da soldagem torna-se um elemento fundamental para a garantia da integridade estrutural da embarcação. Neste trabalho são apresentados os resultados da análise da influência de diferentes fatores na qualidade da soldagem por extrusão de chapas de polietileno de alta densidade. Os fatores analisados envolveram o aporte de calor, a preparação do chanfro, a velocidade de soldagem e a pigmentação do fio de solda. A influência de tais fatores na qualidade da solda foi avaliada tendo como referência os resultados de ensaios de flexão em corpos de prova. Palavras-chave: PEAD; Soldagem; Extrusão; Naval. EXTRUSION WELDING IN HIGH-DENSITY POLYETHYLENE SHEETS -EVALUATION FROM A MARINE POINT OF VIEW AbstractCurrently, extrusion welding of semi-finished HDPE parts (plates) has proven to be an attractive solution for the manufacturing of small service boats. In this sense, welding quality becomes a key element for ensuring the structural integrity of the boat. This paper presents the results of an analysis of the influence of different factors on the quality of extrusion welding of high density polyethylene sheets. The factors analyzed involved the heat input, the preparation of the bevel, the welding speed and the welding wire pigmentation. The influence of such factors on weld quality was assessed with reference to the results of bending tests on specimens.

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