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Propulsion Technology Converting and Repowering One Very Big Ship When the decision was made to convert Dockwise's Blue Marlin to the world's largest semi-submersible vessel, there were obviously many key considerations, with the re-powering of the new ship topping the list. Wartsila was contracted for the job. which included supplying generating sets, two retractable bow thrusters and a large high-efficiency nozzle with new propeller blades for the main propulsion. Blue Marlin, originally built at CSBC in Kaohsiung. Taiwan (new- building 726) was delivered in 2000. equipped with one 6200 mm-diameter open Lips controllable pitch propeller, directly driven by a low-speed diesel engine Vessel Particulars Hub type / diameter Lips 4C1S / 1800 mm Nozzle type Lips HR (high efficiency) Propeller type Lips Controllable Pitch Propeller Propeller diameter 5.200 mm Power 12.640 kW Propeller speed 127 rpm Number of installations One CPP. particulars after conversion. LMT type CS3500-671/3500MNR Propeller diameter 3.400 mm Propeller t\pe Lips Controllable Pitch Propeller Propeller speed 187 rpm Power 4.5(H) kW Input speed 900 rpm Number of installations Two Main Particulars Length bp Breadth Depth DWT Deck area Before 217.8 m 42 m 13.3 m 57,021 tons 7,484 sq. m. After 224 m 63 m 13.3 m 78,000 tons 11,227 sq. m. Blue Marlin - artist s impression after conversion. Left: Blue Marlin in drydock at HMD. The extreme width of the vessel just fits in the dock. Right: CPP, HR nozzle and tunnel construction after modifica- tion. Bottom Left: Transport of the stem section with a weight of 40 tons. -.fv 1111 — T' WAKEFIELD An enormous challenge in the creation of this mam- moth vessel was ensuring it maintained an acceptable Wake Field: Above is the wake field before conver- sion, to the right is the wake field after conversion. 40 Maritime Reporter & Engineering News • WAKEFIELD
