Page 33: of Maritime Reporter Magazine (April 2006)

April 2006 33

Golar LNG Ltd. signed a $55.6 mil- lion contract with Keppel Shipyard for what is being billed as the first ever con- version of an existing LNG carrier into a

LNG Floating Storage and

Regasification Unit (FSRU). Moss

Maritime of Norway has prepared the conceptual specification for the FSRU and will carry out the design and engi- neering. When the conversion is com- pleted in the second quarter of 2007, it will be the first of its type in the world.

Golar LNG will work with Keppel

Shipyard in the engineering, procure- ment and construction for the project.

The scope of work includes installation of new forward turret, side-by-side mooring system, LNG loading arms, aft thruster with compartment, a regasifica- tion plant and replacement of cargo pumps. There is also upgrading of the existing steam power electrical and marine systems. "Golar LNG has been developing this

Floating Energy Solution as part of our strategy to diversify into other parts of the LNG value chain," said Graeme

McDonald, group technical director of

Golar LNG. "It is our belief that no other system can compete with this concept in terms of timing or pricing when satisfy- ing early or extra demand for gas. Our market survey has discovered several specific opportunities for the FSRU, however no fixed employment contract has been signed. The relative pricing differential between LNG and oil and the increased overall energy demand in

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LNG

Golar to Build LNG Floating Storage and Regasification Unit

Principal Dimensions

Vessel type . .Existing LNG Carrier of Moss design

Owner . . . . . . . . . . . . . . . . . . . . . . . . . . .Golar LNG

Built . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1981

Length, o.a. . . . . . . . . . . . . . . . . . . . . . . . . . . . .289 m

Breadth molded . . . . . . . . . . . . . . . . . . . . . . . .44.6 m

Depth molded . . . . . . . . . . . . . . . . . . . . . . . . . . .25 m

Design draft . . . . . . . . . . . . . . . . . . . . . . . . . . .11.4 m

Draft scantling . . . . . . . . . . . . . . . . . . . . . . . .12.52 m

Water depth . . . . . . . . . . . . . . . . . . . . . . . .50 - 150 m

Complement . . . . . . . . . . . . . . . . . . . . . . .44 persons

Capacity . .129, 000 cu. m. at -163 °C, 100% filling

Performance

Gas send-out . . . . . . . . . . . . . . . . . . . . . .240 tons/hr.

Time for berthing, loading and unberthing .24 hours

Capacities

Cargo tanks (100% at -163 °C) 129,000 cu. m.

Gas send-out

Tons/h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231

M MTPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.02

M MSCFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .283

BSCMPA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.75 # Gas send-out can be increased by increasing the onboard vaporization capacity.)

Cargo Containment System . . . . . . . . . .Cargo tanks, . . . . . . . . . .type MOSS spherical type, IMO class B

Number of tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Internal diameter . . . . . . . . . . . . . . .Tank 1 - 35.50 m . . . . . . . . . . . . . . . . . . . . .Tank 2, 3, 4, & 5 - 37.1 m

Tank volume . . . . . . . . . . . . . . . . . . . .129,000 cu. m.

Material . . . . . . . . . . . . . . . . . . . .Aluminum 5083-O

Max. cargo density . . . . . . . . . . . . . . . .500 kg/cu. m.

Max. filling ratio . . . . . . . .99.5% at reference temp.

Insulation material . . . . . . . . . . . . . . . . . .Polystyrene

Cargo Handling System

In-tank cargo pumps . . . . . . . . . . . .1,100 cu. m./hr. - . . . . . . . . . . . . . . . . . .5 sets, 1,400 cu. m./hr. - 5 sets

Spray pumps . . . . . . . . .50 cu. m./hr., 50mth - 2 sets

HD Compressors . . . . . . . . .27,000 cu. m./hr. - 2 sets

LD Compressors . . . . . . . . . . .6,700 cu. m./hr. - 1 set

LNG vapor heater . . . . . . . . . . . . . . . . . . .2,200 MJ/h . . . . . . . . . . . . . . . . . . . . .(7,000 kg/h vapor) - 2 sets

LNG vaporizer . . . . . . . . . . . . . . . . . . . . .7,500 MJ/h . . . . . . . . . . . . . . . . . . . . .(8,800 kg/h LNG) - 1 sets

LNG loading arms . .16 in. - 2 sets on starboard side

Vapor loading arm . . .16 in. - 1 set on starboard side

Inert gas plant . . . . . . . . . . . . . . . . . .5,000 cu. m./hr.

Nitrogen plant . . . . . . . . . . . . .60 Ncu. m./hr. - 2 sets

LNG booster pumps . . . . . . . . . . . . . .267 cu. m./hr., . . . . . . . . . . . . . . . . . . . . . . . . . . .1,980 mlc, - 3 sets

LNG Export vaporizers80,000 - 150,000 kg/h - 4 sets * Two (2) flexible risers are assumed for gas send-out.

Typical calculations for send-out pipeline

Pipe inlet pressure . . . . . . . . . . . . . . . . . . . . . .85 bar

Volume flow rate . . . . . . . . . . . . . . . .2,750 cu. m./hr.

Pipeline nominal diameter . . . . . . . . . . . . . .400 mm

Pipeline inner diameter . . . . . . . . . . . . . . . . .380 mm

Pressure drop per km . . . . . . . . . . . . . . .0.60 bar/km

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