Analysis of Load-out Design of Semisubmersible Production Platform Topside

摘要

With the increase of offshore platform weight, the float-over method has been adopted for offshorerninstallation. A major installation challenge is moving the large-scale topside of the platform safely onto a barge.rnTaking a deepwater semisubmersible production platform as an example, the wharf load-out and dock load-outrnmethods were analyzed respectively. With regard to wharf load-out method, three transportation methods onrnland were discussed with emphasis on self-propelled modular transporters, sliding rail and track. The finiternelement method was used to analyze the stress and deformation results of the topside and stress state of bridgesrnin three methods. It can be concluded that the track method was comparatively reasonable. The barge stowagernplan during the load-out operation was studied as well. A hydraulic lifting platform was used in the dockrnload-out method. The barge was dragged into the dock, moored on the platform, and then the topside wasrnskidded onto the barge through the track. In the end, a comparison was carried out between the wharf load-outrnand dock load-out method from the tooling design, environmental impact and safety point of view. This paperrnprovides meaningful guidance for semisubmersible offshore installation.