The U.S. shale gas boom inspired the marketing demand for a very large containment system (VLEC). Among various kinds of possible cargo containment systems (CCS) for VLEC, the Type-C independent tank is considered to be a reliable, robust design and is a competitive candidate. There are a number of design challenges to design and construct Type-C tanks suitable for VLEC. Thicker plate is generally used, and hence there is more significant tank shrinkage. In addition other factors to be considered includes sloshing, thermal stresses induced by large tank dimensions, and the interaction between tank and hull structure under low temperature conditions. Since the VLEC cargo tank concept design and material selection have been done, the possible maximum thickness of steel plate that may be adopted has been verified. The feasibility of Type-C cargo tank’s application in VLEC project has been researched and verified by various kinds of calculation and analysis, including IGC-based rule check and finite element analysis (FEA), low temperature shrinkage analysis, sloshing analysis, thermal stress analysis, etc. Construction cost and time schedule have also been investigated and compared among three kinds of CCS based on a certain yard case. Some useful conclusions have been presented for VLEC CCS selection.

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