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TUGS & BARGES A Reverse Stern Drive tug will offer the benefits of the ASD and tractor tug in one EVOLVING THE ECO TUG Damen, MTU and Svitzer team on new harbor tug concept L ooking for all of the operational, environmental, and economic benefits of an Azimuthing Stern Drive (ASD) tug, a tractor tug and a gas-powered vessel in one? Then a newly developed vessel called a Reverse Stern Drive (RSD) tug might just be the thing you’re looking for. Three of the biggest names in the marine industry have partnered to develop the first ever RSD Compressed Natural Gas (CNG) tug to the market. The partners include Netherlands-headquartered global shipbuilder and designer Damen Shipyards, German engine manufacturer MTU Friedrichshafen, a subsidiary of Rolls-Royce Power Systems, and Denmark towing company Svitzer. The three companies unveiled the new concept in a joint press release. Damen operates 32 shipyards worldwide and employs some 8,000 people. It builds about 180 vessels annually. A leading towage and salvage company, Svitzer operates 400 vessels and employs about 4,000 people. MTU, meanwhile, builds high-speed engines and propulsion systems for the marine, rail, defense, industrial and mining markets. The new tug won’t be available until 2016, but when it is it will offer high power with lower fuel costs and a substantial reduction in emissions. The new Damen Reverse Stern Drive incorporates the characteristics of an ASD and tractor tug in one—being able to sail ahead and astern, with the same bow height forward and aft. The initial three models in the series will be the RSD 2210, which will have a bollard pull of 50 tonnes, RSD 2512 (70 tonne BP), and the RSD 2914 (90 tonne BP). 24 MARINE LOG July 2014 Compiled By Marine Log Staff Coastal operators that operate within Emission Control Areas (ECAs) are looking for cost-effective solutions to comply with stricter emissions regulations that will come into effect in 2016. Clean-burning Compressed Natural Gas or CNG is widely used in buses, autos, postal trucks, locomotives, and other vehicles. CNG is not commonly used in marine applications. Most recently, CoCo Yachts is constructing a dual fuel catamaran ferry at the AFAI Southern Shipyard in China for operation in Rio de Janeiro. The 78.4m x 14.8m catamaran will have Caterpillar 3512C dual fuel diesel-electric propulsion with four contra-rotating VETH azimuthing thrusters. Its speed is projected at 18 knots and it will have a passenger capacity of 2,000. While CNG has many environmental advantages, it does take up more volume than other fuels such as diesel or Liquefied Natural Gas (LNG). LNG as of late has grabbed many of the headlines. Last year, Norway’s Buksér og Berging took delivery of Borgøy, the world’s first LNG-fueled escort tug, from Turkey’s Sanmar Shipyard. The tug and its sister vessel were built for long term service at Statoil’s Kårstø gas terminal. The 38 m x 14.5 m tug has a bollard pull of 65 tonnes. It is powered by two Rolls-Royce Bergen C26:33L6PG engines fueled purely by LNG and two Rolls-Royce US35 azimuth thrusters. Martijn Smit, Damen Sales Manager Europe, says, “Damen is proud to be building the prototype. With the MTU 4000 engine, this vessel is excellent for ship handling, with very quick acceleration. Maneuverability is combined with the vessel being green, clean and efficient.”

July 2014 Marine Log

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