ABSTRACT:

Monetizing offshore small and mid-scale gas reserves has become a major objective in an LNG market thirsty for new supplies when large base-load projects are delayed. In that context, LNG FPSO is now a mature cost-effective solution to develop these mid-scale offshore gas resources on a relatively short term. Saipem development work on LNG FPSO enables to draw the main typical characteristics of what this facility would be, although a generic design cannot be efficiently adapted to the wide range of feed gas compositions and environmental conditions of the potential application cases. The following technical features can be given for a new-built mid-scale LNG FPSO:

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    Liquefaction: 1.5 to 2 MTPA using a pre-cooled nitrogen expansion cycle. With a limited loss of efficiency compared to the optimized Mixed Refrigerant cycles, significant gains in terms of safety, simplicity and equipment count, reliability and ease of operations, the technology is believed to be the most adapted for mid-scale LNG FPSO.

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    Liquefaction compressors drivers: Aeroderivative gas turbines in mechanical drive configuration.

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    Side-products: Condensates. LPG production avoided whenever possible.

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    LNG storage: around 180,000 m3 net capacity.

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    LNG containment system: LNG carrier membrane (NO96 or MarkIII). SPB as a possible alternate.

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    LNG offloading system: Marinized loading arms in side-by-side configuration. Floating cryogenic flexible hose, when mature, will be a relevant alternate, especially for harsh environmental conditions.

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    Condensates offloading system: Floating hose in tandem configuration.

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    Mooring: external turret whenever possible

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