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GREAT SHIPS OF 1998 Shipbuilder Vessel name Vessel type Owner/Operator Daewoo Heavy Industries Ltd. Loch Rannoch Shuttle tanker Maersk Company Ltd. By the very nature of their operating environ- ment, and the long-term expectations of their users, new-generation shuttle tankers rank among the toughest yet most technically refined vessels, designed to ensure uninterrupted service in arduous conditions. Signaling the entry of both the A P Moller Group and BP Shipping to the shut- tle tanker sector, the 130,000-dwt Loch Rannoch has been designed and constructed for a 40-year life in waters as rigorous as those encountered west of Shetland in the north-east Atlantic. BP Shipping will operate the vessel on behalf of BP Exploration, which has fixed her for an initial seven-year term from disponent owner A P Moller's Maersk Company. Exhaustive attention to structural strength and reliability, state-of-the-art finite element model- ing, the incorporation of significant margins in the scantlings, and the adoption of a highly compart- mentalized hull configuration has been comple- mented by the application of the full redundancy principle to her propulsion and associated sys- tems. Delivered ahead of schedule and within budget by Daewoo Heavy Industries, Loch Rannoch has been assigned to continuous-cycle duties lifting crude oil in 850,000-barrel lots from the Schiehallion floating production, storage and offloading (FPSO) vessel to the Sullom Voe termi- nal on Shetland, some 150-km to the east. On the European offshore oil industry's Atlantic frontier, Schiehallion poses considerable demands on pro- duction and transportation by virtue of the harsh weather and sea conditions prevailing for much of the year. Indicative of what can be expected in operation, the design criteria for the tanker's dynamic positioning (DP) performance and bow loading arrangements have been based on a sig- nificant wave height of 6-m, compared with 4.5-m for similar-capacity vessels deployed in the North Sea. The forecastle and bow mooring deck height including bulwark has been raised by 3-m relative Loch Rannoch Main Particulars Designer Daewoo Heavy Industries Ltd. Country Korea Flag United Kingdom Classification society LR Contract date November 1996 Launch date March 1998 Delivery dote August 1998 Length, o.a 884.5 ft. (269.6 m) Length, b.p 840 ft. (256 m) Breadth, molded 151ft. (46 m) Depth, molded 73.5 ft. (22.4 m) Width of double-skin, side 9.7 ft. (2.96 m) Width of double-skin, bottom .. .10.5 ft. (3.2 m) GT 75,526 Lightweight 26,220.5 tons DWT, design 127,259.7 DWT, summer 130,031.1 Draft, design 50.5 ft. (15.4 m) Draft, summer 51.2 ft. (15.6 m) Speed, service (85% MCR) 15.5 knots Speed, service (alternative engine rating) 14.3 knots (78% MCR with 20% SM) Cargo capacity (liquid) 138,381 cu. m. Bunkers, heavy oil 3,078 cu. m. Bunkers, diesel oil 294 cu. m. Water ballast 60,713 cu. m. Main engine Mftr. ... .Korea Heavy Industries Co. Main engine B&W 7S50 MC CP Propellers Ulstein Diesel-driven engine Ssang Yong Diesel-driven alternator Nishishiba Boilers Mitsubishi Danes Hagglunds Mooring equipment Kock Coating IPK Cargo pumps Kvaerner Cargo control system Norcontrol Ballast control system Norcontrol Complement . . .officers - 22; crew -11; spare - 6 Rudder Schilling Bow thruster Ulstein Stern thruster Ulstei Bridge control systems Norcontrol Fire detection system Consilium FiFi system Namyang Radars Norcontrol Sat/Nav SAIT Loran-C Furuno GPS, DGPS Norcontrol Computer Del Incinerator Teamtec Waste compactor Metos Woste shredder Meto Sewage plant Taiko to that which would be deemed necessary for the North Sea, which itself can be treacher- ous at times. A fre- quently large angle of divergence between wind and waves, a char- acteristic of conditions in the waters west of Shetland, has necessi- tated particular atten- tion to the DP engineer- ing design, given the implications for uptake operations based on the shuttle tanker maneu- vering and lying abaft the FPSO. Two low-speed MAN B&W diesels, located in separate engine rooms, and driving twin Ulstein controllable pitch propellers, with twin Schilling high-lift rudders, gives form to the redundancy concept which infuses the design. In fact, long- term risk management thinking pervades every aspect of the tech- nical project. One expression of this has been the failure mode and effect analysis carried out on the DP system by Lloyd's Register, to which classification of the tanker has been entrusted. The exercise was undertaken to help ensure that no single failure would lead to greater than 50 percent loss of DP capability, in accordance with the DP (AA) nota- tion. Besides two huge thrusters of 2.5-MW apiece located in 3-m diameter tunnels in the bow, Loch Rannoch has an 800-kW tunnel thrust unit built into each skeg. DP (AA) confirms that her hydro- dynamic system with automatic control is capable of moving, maneuvering and holding the desired heading and position of the ship, and that power, control, thruster and other systems pertinent to the DPS have been configured so that a fault should not result in loss of position. For such tankers, loss of position or deviation of course while on station or when approaching or departing the offshore unit could have serious consequences, from a cessation of offloading to collision. Loch Rannoch is a remarkable ship in many respects, and her environmental features reflect not only the sensitivities of the communities bounding her trading domain, but also the corpo- rate disposition of both BP and A P Moller. For instance, the relative narrowness of her center tanks, and the closed-loop vapor recovery system employed when transferring cargo from the FPSO, mirror a concern with minimizing the generation of volatile organic compounds (VOCs). Circle 26 on Reader Service Card Shipyard Vessel name Vessel type Owner/operator Azov Sea DH Oil and Chemical Tanker Valloy Shipping Co. Built by Croatia's Shipyard Trogir, Azov Sea is the fourth in a series of nine 47,400-dwt double hull IMO 3 oil and chemical tankers contracted with Shipyard Trogir and two other Croatian shipyards, Split and Uljanik. The entire series is due for delivery by the end of 1999. Azov Sea and its sisterships are a direct result of more than 10 years research and expe- rience by Shipyard Trogir in the area of double hull designs. The ship is pow- ered by an MAN B&W - Brodosplit 6S50MC Mark VI main engine, which develops 8,310 kW at 123 rpm. Circle 27 on Reader Service Card Azov Sea Main Particulars Designer Shipyard Trogir is. Co. Flag Liberia Classification LR+100A1 Delivery dote March 1998 Length, o.a 598.7 ft. (182.5 m) Length, b.p 573.4 ft. (174.8 m) Breadth, molded 105.6 ft. (32.2 m) Depth, molded to main deck 57.4 ft. (17.5 m) Draft, design 36 ft. (11m) Draft, scantling 40 ft. (12.2 m) GT 27,526 Displacement 57,054 m.t. DWT, design 41,154 m.t. DWT, scantling 47,374 m.t. LWT 9,680 m.t. Speed, trial (90% lood) 15.4 knots Complement 28 Cargo capacity 53,038 cu. m. cargo tanks + 1,260 cu. m. slop tanks Water ballast 21,160 cu. m. Bunker 1,735 cu. m. % high tensile steel 2.5 Main engine Brodosplit - MAN B&W 6S50 MC Mark VI Output 8,310 kW at 123 rpm Propeller Kamewa Generators Ul[anik-Tesu Generator engines MaK Emergency generator Oemp-MAN Motor starter Koncar-Elektrolux Couplings Flange Engine controls UMS Steering controls Porsgrunn Bearings Blohm+Voss Coatings Sigma VHF radio Furuno SSB radio SATNAV Furun Radar Kelvin Hughes Compass Anschiitz GPS Trimble Autopilot Anschiit Pumps Frank Mohn Air conditioning Sabro life boats Grebe Davits FiFi system Unitor Waste management Teamtec-Gola Desalination equipment Aifa Laval Cargo control system Saab Ballast control system Cargo hoses handling crane Radez/Nor Marine 30