Norwegian Ferry Propulsion Retrofit a Money Saver

By George Backwell at October 05, 2013 03:47
Filed Under: Propulsion systems
Rolls-Royce has won a contract to supply its Promas Lite propulsion system to the Norwegian ship owner Hurtigruten for their cruise ship MV Richard With. Propeller efficiency improvement for the ship is estimated to be between 11-14 per cent at 15 knots. MV Richard With: Photo courtesy the owners Promas Lite is a version of the Rolls-Royce Promas integrated propeller and rudder system which is designed specifically for vessels already in service. It is well known that with advances in propeller design, propeller blade changes, or the fitting of new propellers, can have a significant effect on propulsive efficiency, fuel consumption and, therefore, emissions. With Promas Lite these improvements can be maximised, as the propeller and rudder are treated as a complete system, and further increases in efficiency can be achieved with improved manoeuvrability for only a small increase in cost. First, extensive modelling work is carried out at the Rolls-Royce Hydrodynamic Research Centre in Sw... [More]

Groundbreaking DC Bus System in New Diesel-Electric Ship

By George Backwell at October 06, 2012 08:36
Filed Under: drive systems, General
 One of the first ships in the world to use a DC bus system for the main electrical installation recently entered service – the Abis Dover a 6000 dwt twin screw, diesel-electric powered, multipurpose special cargo vessel. M/V Abis Dover: Photo credit Alewijnse Marine Systems Built in the Shipkits shipyard in a project that included Vuyk Engineering Groningen, Alewijnse Marine Systems, all based in The Netherlands, and Finland’s Vacon, the ship’s upper cargo hold is a remarkable 80 m (262.5 ft) in length, almost 75% of the LOA of 107m (351ft), achieved by avoiding space-consuming propellor shafts and going for the diesel-electric propulsion option. Propulsion power comes from six Scania gensets, tucked away in space otherwise wasted, to drive steerable Z-drive thrusters. Not content with that, the design team set themselves the task of  overcoming the main disadvantage of conventional AC power, namely that all the generators have to run synchronously ... [More]

Propulsion System, Design, Tried & Trusty Preferred in USCG New Sentinels

By George Backwell at May 26, 2012 22:30
Filed Under: General
The United States Coast Guard (USCG) ‘Sentinel-class Fast Response Cutter’ Bernard C. Webber,  was commissioned recently in the Port of Miami, the first in a new class of cutters from the Louisiana-based Bollinger Shipyards. Part of the USCG’s Deepwater programme, the Webber will based in Miami to conduct migrant and contraband interdiction missions throughout the Caribbean Sea and Gulf of Mexico; the Coastguard chose a tried and tusty propulsiion system and a well-proven ship design fot these new patrol boats.Sentinel-class Propulsion System The Sentinel Class is powered by two 20-cylinder MTU marine diesel engines with a patrol boat or light duty rating well in excess of 4,300 kW at 2,100 rpm driving twin propellors through ZF Marine 23560C transmissions. A bow thrust gives 75 kW power for manoeuvring. ZF Marine 23560C Transmission Unit: Photo credit ZF Marine Interestingly, ZF Marine has a long record of providing the USCG with propulsion machinery, and... [More]

LNG Diesel Electric Engines for Trail Blazer Dutch Waterway Tanker

By George Backwell at February 12, 2012 03:25
Filed Under: General
A unique Netherlands waterway tanker – the first with diesel-electric propulsion powered entirely by LNG – will soon ply the busy 2,000 km commercial waterways that connect to Europe’s industrial hub and account for about 40% of all international freight movements in the Netherlands. The LNG Greenstream Tanker, fruit of two years R&D and negotiation with statutory authorities and consultants, is scheduled to be delivered from the Kampen yard of builders Peters Shipyards later this year. The 110 m LOA river and canal tanker represents a leap in faith by owners Interstream Barging, who are putting money on their bet that LNG will become the fuel of the future on Europe’s waterways; confident enough not to hedge the bet by going for a dual-fuel engine. LNG Greenstream Tanker: Image credit Peters Shipyards LNG Greenstream Tanker – Design LNG bunker fuel stored in cyrogenic fuel tanks under approximately 2 bar at – 162ºC is carried on deck i... [More]

VLCC Propulsion System – Research on Environmental Effects

By George Backwell at November 20, 2011 03:51
Filed Under: Research & Development
Researchers in the Faculty of Maritime Studies in Rijeka, Croatia, used a Kongsberg Full Mission Engine Simulator to emulate a typical single screw VLCC equipped with a direct drive MAN 5L90MC two stroke marine diesel engine while operating in various sea conditions, from calm to the extreme Force 10 condition. The purpose of the research was to investigate and analyse external sea conditions and their effects on ship’s propulsion system dynamics and operating possibilities. The resulting research paper ‘Impact of the Environmental Sea Conditions to Ship’s Propulsion Engine Dynamics’ was presented by lead researcher Vinko Tomas at the 15th International Research Expert Conference – ‘Trends in the Development of Machinery and Associated Technology’ in Prague, Czechoslovakia, 12 − 18 September 2011. Such is the sophistication of the Kongsberg simulator the research team was able to monitor the relevant propulsion engine variables and parame... [More]

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