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MAN B&W Selected for Ocean Tug

Posted on February 24, 2005

MAN B&W Diesel A/S, Denmark has been awarded the contract to supply a complete twin-screw low-speed, two-stroke propulsion package for a 90 m oceanic mega tug boat. The Chinese Shanghai Design and Research Institute (SDARI)-designed vessel is under construction at Wuchang Shipyard, Wuhan, China for Shanghai Salvage Co. Ltd. The vessel is scheduled to be delivered in April 2006 and will be operated by the Hong Kong-based Shen Hua Shipping Company Ltd. It will be classified by the China Classification Society with an Ice class of B2 and a Class notation of CSA 5/5 Tug, CSM, AUTO-0, SCM, CMS.

The HFO burning propulsion package includes two MAN B&W Diesel 8S35MC main engines each rated 5920 kW at 173 r/min driving MAN B&W Diesel VBS1080, 3700 mm diameter, four-blade controllable pitch propellers through Flender type GUG 1200 gearboxes with a speed ratio of 170:1500 r/min. The medium-skew propeller blade profiles are optimized for nozzle operation to give a bollard pull of 188 tons and a speed of 16 knots. The propeller shaftlines each consist of a 17m tail shaft, an ODS oil distribution unit/coupling flange and 3 x 6 m intermediate shafts. Each grearbox also drives an 1160 kW / 1375 KVA shaft alternator via a flexible tooth coupling.

The Alphatronic 2000 Propulsion Control System with twin main bridge and control room manoeuvre stations, includes interfaces to a power management system and a Kongsberg Simrad JoyStick System coordinating the control of propellers, rudders and tunnel thrusters. The shipment of engines and propulsion equipment is scheduled to take place between June and August, beginning with the propulsion control equipment, to match the shipyard installation schedule

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