The present invention relates to a monorail connection system in an FPSO for carrying equipment between a stationary monorail support structure and a unit module comprising a monorail coupled to the monorail support structure, wherein a support member for supporting the hydraulic jack on the lower surface of the monorail support structure And the upper surface of the monorail is vertically formed with a plate coupled to a hydraulic jack coupled to the support member. Through the above-described monorail connection system, the monorail can be safely moved using the hydraulic jack and guide plate when the monorail is connected, and the safety of the post-connection support structure can be improved.
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