Feature 3
on the historical fuel data base analysed, Ferries vessel Mega Express III, for and make adjustments, if necessary.
it is possible to compare how the same example, operated by Corsica Ferries After installation, the shipowner reports
ship behaves with different senior officers. between Italy and Sardinia,
V.Delta that masters and crew members found
It is, for example, possible to see if one recommended the installation a dynamic the system easy to use and were soon
master consistently arrives in port more trim assistant on board. able to manage the trim of the ferry in a
than one hour in advance, or if the power Over 212m in length, this roll-on, much more proactive and effective way.
plant always has a lower than average roll-off ferry can transport 650 vehicles “DTA helped to focus the crew on the
efficiency with the same chief engineer. and 2100 people and travel at speeds importance of trim management to reduce
After fuel saving training has been given, of up to 35knots. However, while built fuel consumption,” said Mr Parenti. “We
crew sit an exam. to high specifications, Mega Express have had good feedback about DTA from
From the more technical point of III had one drawback: it was expensive those who use it.”
view, in establishing a ship’s ‘fuel history’, to run. Compared to other vessels in The Mega Express III crew can now also
V.Delta takes abstracts from the engine Corsica Ferries’ fleet, Mega Express III ensure that the ferry sails at its optimum
log covering speed, propulsive power had the highest fuel consumption per trim for each and every journey. As a
and fuel consumption at sea in different mile travelled. result, the ferry is operating with far
sea states, and while in port. As some Like all ship operators, Corsica greater fuel efficiency.
of the suggested actions require an Ferries knew that the trim and drag “We have reduced fuel consumption
investment,
V.Delta first identifies the affected fuel consumption. However, the on the Mega Express III by three percent
potential savings through the analysis of organisation had no way of monitoring in the high speed range of over 25knots
fuel consumption trends over a two to actual trim during sailings and altering per hour,” said Mr Parenti. “This
three year period, and then suggests the the trim accordingly. corresponds to an annual reduction in
possible actions to reduce the annual fuel “The trim adjustments were based on a fuel requirement of 980tonnes.”
consumption. table of optimum trims derived from sea At an operational level, the company
Technical recommendations have trials of Mega Express III, which had been has recommended water hull cleaning
included application of foul release paints conducted before she was put into active once before drydocking, or each
instead of traditional antifouling paints, in service,” said Giuseppe Parenti, technical six months (depending on the type
order to reduce friction, updating autopilot manager at Corsica Ferries. “We wanted to of hull coating), water propeller
systems, inserting interceptor plates and find a way to better monitor the optimum brushing each four to six months and
ducktails, minor modifications on ship trim during sailings and thereby reduce itinerary modifications, speed profile
hull appendixes, grinding of weld seams the vessel’s fuel consumption.” optimisation, guidance for operation
in the bow area, propeller optimisation, Following the deployment of Eniram’s in shallow water, guidance in use of fin
the installation of frequency converters to Dynamic Trimming Assistant, the annual stabilisers, maintenance of the engine
various pumps and fans, the improvement fuel consumption of Mega Express III fuel system, and the maintenance of
of waste heat recovery efficiency through ferry dropped significantly. Designed turbocharger and charge air cooler.
modifications to automation, and control specifically for the shipping industry, this
V.Delta reckons to have achieved
improvements on AC system and air technical solution calculates the current average reductions in fuel costs of 3-5%,
handling units and a chiller control trim of a vessel and displays it onboard, which it guarantees through a no-cure-
system. on a very clear and self-explanatory user no-pay proposal. The 3-5% range depends
Each vessel requires special attention, interface. Crew members can instantly see on the ship’s initial performance, age and
of course. In the case of the Corsica if the vessel is sailing at the optimum trim its employment. NA
THE INTERIOR
SUPPLIER OF CHOICE
• Walls
• Ceilings
• Doors
• Glazed Partition
• Windows
• Wet Units
• Furniture
• Sound reduction up to 54dB
• Fireclass B-0 to H-120
MARINE INTERIOR SYSTEMS -
www.norac.no
The Naval Architect February 2010 61
NA Feb10 - p60+
p61.indd 61 03/02/2010 11:35:49
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