The disclosed information, while effectively dispersing the vertical load by installing the particular cross beam and the cross beam to the partition wall structure of only the vertical stiffener relates to a large LPG FSO (LPG Floating Storage Offloading) of the ship tank receiving part partition wall (transverse bulkhead) structure with a lattice structure , it is possible to reduce the thickness of the reinforcing material it becomes possible to secure the space without entering the installation of the hatch, to a partition wall in the vertical electric field is also reduced.; LPG tank receiving portion of the line, such as the partition wall (LPG tank bulkhead) is a vertical reinforcement (vertical stiffener) (110); And between the vertical stiffener 110 and the vertical reinforcing material (110) comprises a cross beam (horizontal stringer) (120) at least three or more, which is installed in a right angle connection structure between the vertical stiffener 110 and the vertical stiffener 110 the cross beam (vertical web) provides a line of LPG tank receiving part partition wall is 120 is installed.
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