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Evaluation of Mating Dynamic Forces of Semi-submersible Offshore Structure Topside Module

반잠수식 해양 구조물 상부 모듈의 해상 결합 작업시 동하중 평가

  • Received : 2012.08.06
  • Accepted : 2013.02.14
  • Published : 2013.02.28

Abstract

This paper calculates the mating dynamic forces of a semi-submersible offshore structure's topside module, where a hull moored in the sea is combined with a topside module carried by a heavy lift vessel, as a mating installation method. The environmental conditions include various wave directions and wave heights, with constant wind and current speeds. Appropriate ballast and de-ballast plans for the heavy lift vessel and hull of the semi-rig should be performed in order to safely obtain these forces, whereas a fixed platform or the GBS (Gravity based structure) type of offshore structure only needs a ballast plan for the heavy lift vessel. From this paper, the allowable wave height or wave direction for the mating procedure can be investigated based on the standard DAF (Dynamic amplitude factor) of the rules and regulations.

Keywords

Semi-submersible offshore structure topside module;Mating installation method;Mating dynamic forces;Heavy lift vessel

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