FLNG Jetty Mooring Analysis And Research

In recent years,as a highly efficient and clean energy,natural gas has received the attention of many countries in the world,the demand for Floating Liquefied Nature Gas Unit(FLNG)gradually increased.FLNG is to be designed with high security and reliability in technical requirements as LNG needs to be stored and regassed in normal temperature and pressure.With the increase of the global natural gas trade,the research and development of FLNG has certain economic and strategic significance.On 19 November 2014,the world’s first commercial FLNG,Caribbean FLNG,successfully launched in Nantong,Jiangsu,China.At this point,this new and economic FLNG project that will change the pattern of market competition has made a further step towards its commercialization.The Caribbean FLNG is a non-self-propelled barge,which can convert 7.2 billion standard cubic feet of natural gas into a liquid natural gas(±0.5 million tons LNG per year).And it can be used for temporary storage and export.The Caribbean FLNG will be placed on the Caribbean coast of Columbia,becoming the world’s first FLNG operated commercially.In this thesis,the Caribbean FLNG is taken as an example and its hydrodynamic performance under jetty mooring condition has been studied through numerical simulation and theoretical analysis.An effective and reliable mooring system design has been put forward.Specifically,the following work was carried out,1.Finite element model of the Caribbean FLNG was established and discretized using the MSC Patran software.Based on potential flow theory and BV’s Ariane 7 code,the wind and wave loads on and motion responses of the FLNG were predicted and supplied to the numerical simulation code for analyzing the Caribbean LNG’s jetty mooring performance,such as the time histories of cable tension and platform motions.2.The mooring system for the Caribbean FLNG was designed and optimized,enabling the final selection of a feasible system according to the requirements for mooring system design of offshore floating platforms,such as MODU(Code for the Construction and Equipment of Mobile Offshore Drilling Units)and the rules of BV to which the Caribbean FLNG is registered.3.According to the characteristics of interaction between the mooring system and platform hull,coupled nonlinear analysis in time domain as well as quasi-dynamic analysis were employed to simulate the motion and stress responses of the FLNG under jetty mooring condition.