Shell Bonga FPSO: double hull FPSO by Samsung Heavy Industries. (Distinctive Ships from Korea).

Samsung's Koje Shipyard this year completed a 2,000,000 bbl floating oil production, storage, and offloading unit for the Shell Nigeria Exploration and Production Company. The double hull type FPSO is designed to be permanently spread moored in the Bonga

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The vessel's role is to support the production facilities, provide storage for crude oil and mooring for the oil off take tanker for a period of at least 20 years without dry-docking.

It is capable of receiving stabilized crude at an average daily production rate of 225,000 bbls per day at a maximum temperature of 600[degrees]C.

The offloading system is designed so that a parcel of crude oil of 1,000,000 bbls can be transferred to an off-take tanker within 24 hours. The system shall be capable of discharging at a total continuous rate of not less than 7,000 [m.sup.3]/hr with a discharge pressure of approximately 150 m.

The vessel has a 5x3 configuration of cargo tank, 5 pairs wing water ballast tanks, two slop tanks, two diesel oil tanks, two methanol tanks, void spaces, aft and fore peak tanks and aft machinery and accommodation spaces. Cofferdams provide for isolating the methanol tank and chemical tank from the adjacent tanks.

The machinery space is located underneath the accommodation spaces and the double bottom in way of machinery spaces is used as sludge and oily water drain tanks.

The topside process facilities are located on a process deck, elevated 5.5 m above the main deck of the hull at the centerline. A helideck is located above the accommodation block.

The hull structure has been designed and constructed to remain on station for the hull field life without recourse to drydocking. The longitudinal strength of the vessel takes towing conditions into consideration.

The fixed spread mooring system has been designed based on a mooring analysis carried out considering the field environmental loads. It consists of four groups of three mooring legs located on port and starboard sides at both fore and aft ends, two sets of 10 tonne air tugger winch, mooring fitting such as bollards and mooring chocks.

The vessel has a foam fire extinguishing system, water mist system, portable extinguishers and seawater extinguishing system. The vessel is equipped with four lifeboats on the sides of the accommodation and one at the forecastle deck. A rescue boat with davit is be provided at the stern.

The main machinery space is a wide enclosed, fire protected and ventilated space ergonomically designed to maintain the proper segregation between the different systems and adequate redundancy in piping, fitting and positioning of the equipment. It has been provided with normal access from the accommodation space through stairways. The equipment is remotely controlled and monitored from the Central Control Room located in the accommodation area.

Other than the topside mounted normal gas power plant, the machinery space is equipped with an essential service generator and an emergency generator, each of 1,900 kW output.