LNG-FSRU (Liquefied Natural Gas-Floating Storage and Regasification Unit) can adopt the structure of double-row cargo tanks. Meanwhile, its heat maintenance system has the characteristics of the special structure, the large temperature difference between inside and outside and the complicated heat transfer process. Aiming at this particular structural form and considering the hull structure and some effect of convection in cavity, this paper establishes the mathematical model and utilizes the finite element method to conduct the deep analysis of ultra-low temperature field in order to obtain its temperature distribution in the ultra-low temperature field. Moreover, the results indicate that the temperature distribution of the double-row-tank structure is linear from the inside out with the relatively uniform overall distribution; the temperature difference above and below the waterline has affects the temperature distribution of the inner shells; the temperature of the middle longitudinal cofferdam zone is relatively lower than that of other areas.

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