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Astilleros de Santander Converts, Lengthens RoRo Ship Astilleros de Santander recently delivered the RoRo vessel Dana Maxima to owner DFDS AS of Denmark after a lengthening and conversion operation designed to make the vessel more suitable for operations in North Sea trade. The RoRo cargo capacity of the vessel was increased up to 2,800 lane meters or 210 trailers. The vessel was lengthened by a total of 103 ft. (31.5 m). Double bottom and heeling tanks were modified, and existing lifts and flush cov- ers were removed, as was an existing gantry crane. A new rudder arrangement was imple- mented which entailed the rudderstock center being moved aft and the installation of two new Becker rudders, each with a new Frydenboe steering gear. Other work performed included raising the forecastle deck, renovation of firefighting and detection systems — including removal of the existing Halon system and the installation of a new low-pressure refrigerated COo system to protect the engine room, trailer hold and trailer spaces. A new deckhouse was installed on the vessel's port side to accommodate the CO2 room and sprinkler system, and hawsepipe modifica- tions were carried out to improve seakeeping with new anchors. A new self-tensioning moor- ing winch was added, as was an automatic IPH remote tank sounding system. Two new bowthruster electric motors were installed, increasing power from 550 kW to 800 kW for each bowthruster. The order for the work was placed in December 1994, and the vessel arrived at the Santander yard on June 1, 1995. Redelivery took place on July 18 after successful sea trials. For more information on Astilleros de Santander Circle 120 on Reader Service Card Before After Length o.a 464 ft. (141.5 m) 578 ft. (176.2 m) Breodth molded 66.9 ft. (20.4 m) 66.9 ft. (20.4 m) Draft (max) 21.7 ft. (6.6 m) 20.7 ft. (6.3 m) DWT 6,552 t 8,546 t ZF Introduces New Reverse/Reduction Gear To North American Market ZF Industries has now introduced to the North American marine markets its BW-751 reverse and reduction marine transmission for continuous-duty, single- or twin-screw propul- sion applications. The new transmission is a deep ratio version of the company's popular BW-750 family, a design that makes it well suit- ed for workboats and fishboats, large yachts and merchant vessels. Like other transmis- sions in the ZF series, the BW-751 meets ABS and NATO AQAP-1 quality assurance program standards. Six gear ratios from 4:1 to 6.83:1 are offered standard with this transmission, and according to Richard Graff, application manager, marine, at ZF's headquarters in Vernon Hills, 111., up to 2,368 hp can be transmitted continu- ously at a maximum input speed of 1,800 rpm. Also, the transmissions provide equal power ahead or astern, and reportedly are easily adapted for non-standard, counter-rotating engines. This is achieved by a 180-degree rota- tion of the main oil pump mounted externally on the back side of the transmission housing. This pump is gear driven via the engine driven input shaft. To meet the rigorous demands of continuous duty service, the Model BW-751 has an extremely torsion-resistant cast iron housing. The transmission has three shafts with multi- Mitsui Delivers Bulk Carrier Baltic Hawk The 46,638-dwt bulk carrier Baltic Hawk, built at the Tamano Works of Mitsui Engineering & Shipbuilding Co., Ltd. (MES), was recently completed, and delivered on September 8 to its owner, Green Spanker Shipping SA. The handysize bulk carrier, which will carry a crew of 25, has five cargo holds with four cranes in total. The 623-ft. (190-m) vessel is powered by a Mitsui MAN B&W 6S50MC diesel, which drives the vessel to a speed of just over 14 knots. Classed by NKK, the Baltic Hawk flies the flag of Panama. For more information on MES Circle 123 on Reader Service Card h o.a.... Breadth (molded) 102 ft. (31 m) Depth (molded) 54 ft. (16.5 m) Draft at full load (molded) 38 ft. (11.6 m) Gross tonnage 27,011 tons (metric) Speed 14.14 kn Ingalls-Built Aegis Destroyer, Stethem, Commissioned disc clutch packs fitted to the input and reverse shafts. In the event of service requirements, the main components, including the clutch packs, are accessible through openings in the housing of the transmission. All load carrying bearings are of the anti-fric- tion type. The output shaft flange is designed for use with standard bolts, and this in turn permits installation of custom-built prop shaft flanges, if required, in place of the standard prop shaft flange. The transmission is avail- able with an optional trailing pump which is prop shaft driven and fully operational at all times. The model BW-751 offers four different PTO options for SAE standard hydraulic pump drives. Also available is a wide range of tor- sional couplings; a customer-specified coupling can readily be installed. Optional for application with ZF's complete family of BW-750 transmissions is the compa- ny's Autotroll system. The electronically-con- trolled trolling system allows the operator to make use of an infinitely-variable propeller speed range beneath the vessel's engine idling speed. This system can be used without restric- tions for both ahead and astern travel, enabling low-speed maneuvering in narrow waterways, docking, position holding, and similar require- ments. The first BW-751s are now in service in the U.S. via a retrofit installation aboard the 91-ft. (27.7-m) push tug Southern Kraft-16. Owned and operated by International Paper Co., head- quartered in Memphis, Tenn., the push tug nor- mally operates on the Southern waterways with eight loaded barges in tow, averaging 9,200 tons of wood products. The ZF transmis- sions are matched to a pair of counter-rotating 3512 TA turbocharged and intercooled diesels installed during repowering in 1990. Each are rated 1,060 hp at 1,200 rpm. For more information on ZF Circle 122 on Reader Service Card DDG 63, USS Stethem — the sixth DDG 51 class Aegis guided missile destroyer built for the U.S. Navy by Ingalls Shipbuilding Division of Litton Industries — was commissioned and reported for Pacific Fleet duty at ceremonies held at the Naval Construction Battalion (Seabee) Center at Port Hueneme, Calif. Commander Steven C. Miller, USN, will assume command of the new ship, which will be homeported in San Diego. DDG 63 is the 13th destroyer in the DDG 51 class, and the sixth to Cross- section of the ZF BW-751 reverse/ reduction marine transmission unit. 28 Maritime Reporter/Engineering News
