Super-Slow Steaming: VTI Turbocharger Retrofit Pay-Off

By George Backwell at November 01, 2013 23:20
Filed Under: Marine Diesel Engines
What to do when the tanker markets are depressed? Maersk Tankers has taken a hard look at bunker fuel consumption, which on their Very Large Crude Carriers (VLCC) makes up about 85% of the voyage costs. They found that the key to improve earnings is super slow steaming, which they’ve taken to a whole new low with giant VLCC’s ambling over the oceans at speeds as slow as 8.5 knots.Super slow steaming requires engine load to be decreased down to 10%, which is equivalent to 50% speed, but the company recently decided to further economise on fuel consumption (and not by reducing the speed of its ships yet more) with the retrofit of a Variable Turbine Inlet system (VTI) onboard the 318,000 dwt crude oil carrier Maersk Ingrid. Manufacturers, Mitsubishi Heavy Industries Marine Machinery & Engine (MHI-MME) say that their VTI turbocharger system has been been fitted to more than ten new buildings, but never before retrofitted to an existing unit, a job that took just four days d... [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]

New Era for Tanker Shipping

By Keith Henderson at December 07, 2010 07:43
Filed Under:
Yesterday in London, the DNV classification society unveiled the Triality VLCC concept vessel. The vessel is fueled by liquified natural gas (LNG), has a special hull shape that does not require the use of ballast water and virtually eliminates harmful exhaust emissions. A further bonus is its attention to the problem of vapors emitted by the cargo and providing a solution to use them. The LNG fuel carried is sufficient for 25 000 nautical miles of operation. The new vee shaped hull with revised cargo tank layout dispenses with the use of ballast water in the empty condition: rendering a higher net efficiency for a round trip. Cargo vapors are collected , liquefied and stored as LPG for later use during the trip. DNV estimate that the capital cost of their new design will be 10-15 per cent more however the through life cost saving will be 25 per cent less than an equivalent VLCC of conventional design. [More]

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