LNG Containment Dike Design and Monitoring at Southern LNG Elba Island Phase II Expansion

摘要

The phase II expansion of the Southern LNG Elba Island terminal involved construction of a new storage tank and 3400 linear feet of earthen containment dikes. The dikes, classified as Category I structure, were designed and constructed to contain liquefied natural gas (LNG) in the event of a spill in accordance with the FERC requirements. The site features a layer of very soft clay in the upper 35 feet underlain by loose to medium dense sand layer. The design and construction had to overcome challenges in slope stability, settlement and potential liquefaction. This paper discusses the design considerations and the instrumentation and monitoring program performed during construction.