Sizing of storage tanks at liquefaction and regasification terminals is one of the key issues in the LNG chain design. Storage volume is provided as a buffer between continuous production of the plant and the batch nature of the shipping process. Several rules of thumb have been developed in order to size the storage but they are general and conservative. To evaluate the best size for the storage and its impact on the overall capacity of the terminal a new PC Windows based model using @Risk has been developed to simulate the whole LNG transport chain. The model considers, with a probabilistic approach, most of the variable influencing the LNG cycle from the liquefaction to the regasification terminal, including the meteomarine conditions along the route that could influence the carriers' navigation time. Two different LNG transport routes can be analysed at the same time to simulate more complex scenarios of LNG import/export. As a results, the simulation gives the performance of the terminal in terms of production, operative storage volume variations and shipping data (e.g. total carriers' waiting time). With these data the sizing choice results effective and its impact on the terminal performance is proven. The model has been used in determining the proper storage volume for the Egyptian LNG Liquefaction Plant (owned by BG, Edison, EGPC and EGAS) and for the Edison Regasification Terminal in the Adriatic Sea.

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