oto 2001/073 Failure modes,reliability and …

1 ANNEX EE1 ANNEX EInformation on specific UK and North Sea fpso and FSUI nstallationsCONTENTS1 Ailsa Craig FSO32 Alba FSO43 Anasuria FPSO54 asgard A FPSO115 Balder FPU156 Berge Hugin FPSO177 Bleo Holm FPSO218 Captain FPSO239 Douglas FSO2510 Glas Dowr FPSO2711 Gryphon A FPSO2912 Jotun FPSO3113 Maersk Curlew FPSO3314 Nordic Apollo FSO3515 Norne FPSO3716 North Sea Producer FPSO4117 Petrojarl 1 FPSO4518 Petrojarl Foinaven FPSO4719 Ramform Banff FPSO5120 Schiehallion FPSO5321 Triton 1 FPSO5522 Uisge Gorm FPSO5723 Varg FPSO5924 Vinga FSO61 KeyN/K Not KnownN/A Not ApplicableBlank Not AvailableSee Annex A for summary on individual UK FPSOs and FSUsSee Annex E for more detail World-wide FPSOs including other North SeaE2E31 AILSA CRAIG FSOI nstalled in North Sea 1989 Retired 1996 Operator SovereignEmerald Field, UK North Sea until 1996 - Now Ima Field Nigeria150m water depthNo TurretTripod WishboneNew BuildDetailed information not availableE42 ALBA FSOI nstalled in field 1993 Operator Chevron UKAlba Field, UK North SeaInternal Turret IPTT urret Supplier SBMP ermanentFluid Transfer system (FTS): Multipath SwivelFTS supplier.

2 SBMR oller bearingMain roller bearing is located at the bottom of the turret above chaintable (See cross sectiondrawing).12 wellsNew BuildDetailed information not availableE53 ANASURIA FPSOD esignNewbuild monohull FPSOF ieldLocationTeal, Teal South, Guillemot AUK 21/25 (Teal, Teal South); 21/25, 21/30 (Guillemot A);Central North Sea, 305 km E of AberdeenCountryOperatorStatusDesignation Previous Names:UKShellProductionAnasuriaDutyStatu s of UnitUnit OperatorOwnerProduction, storage, offloading, accommodationProductionShell UK Exploration & Production ExproManagerEngineeringSBM Inc., Monaco (main contractor); Stork Protech, Holland (topsides engineeringsubcontractor); Mitsubishi Heavy Industries (barge subcontractor)Build HistoryMitsubishi Heavy Industries, Nagasaki, Japan (bargesubcontractor); AMEC Process & Energy (subcontractor forturret and process system; integration of hull, turret andtopsides)Conversion EngineeringFPSO and mooring installation subcontract, Aker/Heerema;installation of tie-backs, flexible risers, Fulmar pipeline tie-in,McDermott.

3 Subsea facilities, Cooper Oil Tools, LeedsOther main ContractorsOther Main ContractorsDelivery24 August 1996 sailawayE6 Basic DesignBASIC CONCEPTThe fpso comprises a new build turret moored monohull vessel capable of continuousoperation in the CNS. A minimum service life of twenty years is required and it is envisagedthat the fpso will be demobilised after ten years service for major survey, maintenance andrepair. The fpso exports oil to the existing Shell/Esso fleet of shuttle tankers or to third partytankers. Tankers are moored astern to the fpso during fpso is connected to subsea production manifolds using flexible risers, flowlines andcontrol umbilicals.

4 All fpso systems, including the subsea systems, are monitored andcontrolled from a single control room by an integrated Control and Management main functions of the fpso are summarized as follow: production of dead crude forexport by shuttle tanker; export of associated gases consistent with the Fulmar Gas Linerequirements; treatment of produced water prior to disposal overboard; provision of facilitiesfor water injection; provision of facilities for water injection; provision of utility systems forFPSO shipboard, topsides and subsea operations; space and weight provision for a futureidentical gas compression train, production separator, oil import and gas lift are DESIGNThe barge is designed to receive, store and offload crude oil produced from subsea wells andtreated in the topside facilities.

5 Minimum provisions to allow future import of stabilized crudeare provided. It is capable of storing 850,000 bbls of crude, based on 98% of full capacityexcluding the slop tanks. It is provided with a helicopter deck, accommodation space (whichfunctions as the TSR -- Temporary Safe Refuge) and a machinery space, all located at the sternof the barge has a double hull consisting of side ballas tanks over the full length of the cargotanks, and a single bottom. The main hull is divided by bulkheads into the followingcompartments: fore peak water ballast; no. 1 side water ballast tank; cargo tanks and side waterballast tank; cofferdam; machinery room and double bottom space; aft peak water ballast cargo tank part is divided by transverse bulkheads into seven cargo oil tanks, and one pairof slop tanks.

6 A centre line swash type bulkhead is provided in the cargo oil tanks. The centretanks are allocated to crude oil storage, while the wing tanks are used for seawater produced oil from the topsides is received with a decanting line to where final crudedehydration takes place. In this process the remaining water settles by gravity prior to beingdisplaced to one of the slop tanks for further treatment to allow overboard crude oil is then transferred to the dedicated oil storage tanks are designed for filling levels ranging from empty to full in terms of local tankstrength.

7 During normal operation ballast tanks can be either full or empty to allow ease ofoperation. The barge is operated on an even keel condition in combination with ballastoperation with a slight trim by the stern during stripping cargo tanks are equipped with individual submerged cargo offloading pumps. Crude oil isexported via a fiscal metering system to a tandem moored shuttle tanker. The cargo pipingsystem is designed to enable simultaneous reception of crude oil from the topside facilities andoffloading of the cargo. The cargo and slop tanks are equipped to allow crude oil washing,inerting, venting and gas freeing of any individual tank without affecting the safety or thecontinuity of crude oil production and storage.

8 All cargo and ballast tank equipment andassociated systems are remotely controlled and monitored from the ICC (Installation ControlCentre) located within the ComponentsTurret consisting of four sections, 1500 mt, Amec Process &Energy, Wallsend; 29 topsides modules, 100-200 , IHC, KinderdijkProcessing topsides modules (22), 3500 mt, Amec Process &Energy, WallsendQuarters/helideck, Mitsubishi, NagasakiMain control room, 500 mt, Ferguson Seacabs, InverurieSwitchgear module, 500 mt, Ferguson Seacabs, InverurieE8 MooringThe turret benefits from the experience SBM Inc. have gained from their latest turret designs,and limits the number of critical mechanical components, such as the bearings, by using asingle roller bearing located at the optimum vertical position for consists of a chaintable structure anchored to seabed anchor piles via twelve catenarymooring anchor lines, able to limit excursions to 24 metres in extreme conditions.

9 The anchorsystem consists of, from top to seabed: 110m chain attached to base of turret; clump weightconsisting of 150m x 6" double length chain; 30m x 6" chain; 700m x " Bridon sheathedspiral strand wire rope; 150m x 6" chain attached to diameter x 31m long chaintable structure is suspended from a heavy duty roller bearing which is locatedapproximately 7 metres above the keel of the fpso . The 7m diameter triple race bearing,fabricated by RKS, is supported on the tanker side by a reinforced box structure integrated intothe forward part of the fpso vessel's hull. A turret cylinder, housed in a diameter welland extending upwards until some two metres above the vessel's main deck, is mounted to theearth-fixed side of the main bearing.

10 The turret cylinder houses the riser 'I-tubes' and supportsthe turret main deck, the manifold platform, and the swivel deck together with the swivel stack,the mooring line and riser winches, and all the earth-fixed part of the rigid piping. A radialbearing assembly is used at tanker main deck level to absorb the radial loads caused by theaccelerations of the upper turret structural mass and to act as a radial bearing during a possibleoffshore change-out of the main bearing. The entire assembly including manifold platform andswivel extends some 30 metres above the main the vessel moves off station, due to the effects of wind, wave and current, certain anchorlines are lifted.