Investigation of jetting piping system in the spudcan of wind turbine installation jack-up vessel

초록

The offshore wind turbine in shallow water is installed by a self-elevated mobile unit which is usually referred to as jack-up barge or jack-up vessel. The jack-up vessel consists of a buoyant platform together with independent legs that can position the vessel above the water reducing external loadings for safe operation condition. The retrieval process of jack-up legs could be very difficult due to the high extraction resistance caused by soft soil. In soft clay, since the high suction force can be developed around the spudcan attached at the end of jack-up legs, a jetting system is required to break the suction to pull out the legs. It is important to design the jetting system with optimized piping arrangement to allow the easy operation. There are various factors to be considered in the design of jetting piping system since the level of embedment and the type of soil and pipe size and locations, etc. can affect the performance of the system. In this paper, the design of 500m^3/hr jetting system is introduced with PIPENET program analysis. Also the various consideration factors in the analysis are discussed. © APAC 2013.All rights reserved.

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