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the hydrostatic pressure from the weight of the LNG. Jeon et al.[5] applied a specia l method to predict the tempera ture of the inner walls of the insulation. I n their proposed model, the effects of the oute r t ank , t he i nsul at io n l ayer a nd a s uspended deck were considered. The geo metrical d imensio ns of the tank and t he properties of the material used in the tank can b e found in this Reference.

During normal operation, the inner tank is exposed to cryogenic temperatures from the LNG. However, if LNG leaked from the inner tank , it would soak into the insulation. In the event of such an accident, some insulation layers would not be able to function, and the outer concrete tank could be structurally compromised by a quick temperature drop [3]. In conclusion, the safety of the tank can be ensured only through a thorough thermal analysis. Graczyk et al. [6] performed a probabilistic analysis of the sloshing-excited tank pressures in LNG tankers. They found that ship motion results in violentfl uid motion in the tank which causes high tank pressure. The pressure was measured in a series of a model tests, and the important issues of structural responses, such as the
signifi cance of spatial and temporal characteristics of sloshing loads as well as the model scaling problem were addressed.

Design specifi cation of the tank has to be studied thoroughly in order to do a simulation of the storage tank . The properties of all the parts of a storage tank have been described by Jeon and Park [7]. They discussed safe and economical construction for the aboveground LNG tank s. As the capacity increases, special attention needs
to be given to the design code and an effi cient procedure needs to be established to design an LNG tank with structural and cost ef fi ciency. Various analyses have been carried out by KOGAS technology[8], including static analysis, wind loading, modal and seismic analysis, temperature modeling, leakage modeling, pre-stress/post tensioning, burn-out modeling, relief valve heat flux modeling and soile structure interaction. They used the LUSAS finite element modeling software to design a 200,000 m3 above-ground tank. They considered an axisymmetric model for the static stress and thermal analysis, and 3D shell elements for modal analysis and seismic analysis. For burn-out modeling, they performed a transient thermal analysis and predicted the time required for the fuel to burn-out completely.

Natural convection causes circulation of the LNG within the storage tank which tends to maintain a uniform liquid composition. The addition of new liquid can result in the formation of strata of slightly different temperature and density within the LNG storage tank. “Ro l l ove r ” refers to the rapid release of LNG vapors from a storage tank caused by stratification. The potential for rollover arises when two separated layers of different densities (due to different LNG compositions) exist in a storage tank. LNG rollover phenomena received considerable attention following a major unexpected vent-ing incident at an LNG receiving terminal at La Spezia, Italy in 1971 [9]. The main hazard arising out of a rollover accident is the rapid release of large amounts of vapor leading to potential over-pressurization of the tank. It is also possible that the tank relief system may not be able to handle the rapid boil-off rates, and as a result the storage tank 本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。