Nearshore solutions for storage and regasification of liquefied natural gas using large floating structures such as FLNG (Floating Liquefied Natural Gas) and FSRU (Floating Storage and Regasification Unit) are becoming popular due to their economic and safety advantages. Permanent mooring systems are designed specifically to keep these large floating structures within an acceptable excursion range for the site-specific environmental conditions and design life of the structure. A typical jetty mooring arrangement, which has been commonly used for temporary berthing, is upgraded to nearshore position mooring of FLNG/FSRUs. The higher mooring loads and longer design life requires consideration of several factors which are discussed here. A case study has been carried out based on the ABS best practice guidelines to provide detailed analysis procedure. The effect of bathymetry, water depth, tide, directional wind, wave and current, interaction between the mooring lines, fenders and the vessel, interaction between LNGC (Liquefied Natural Gas Carrier) and FLNG are studied. Sensitivity of mooring load prediction to various modeling parameters is also presented. Finally, an overview of the latest industry effort of developing guidelines for the assessment of environmental loads and nearshore mooring system is given.
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