Small changes give big savings

New vessels may be the winners in the battle for efficiency, but they usually come with a high cost as well. So with a successful retrofit, there is a powerful way to close the efficiency gap between new and older tonnage. Maersk Tankers has proved this by adding nine different technologies on a vessel and achieving 10% in fuel savings.

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The true winners turned out to be Mewis Duct and propeller boss cap fin (PBCF) that together provided more than half of total savings. Both technologies were tested together and separately to conclude that combination of both is the best investment.

Maersk Ingrid, a 318,395 dwt VLCC vessel was selected for the pilot project and received a total of nine new installations, that were grouped in 3 categories:

1) more efficient propulsion

2) lowering electrical consumption

3) re-using produced heat

The true winners turned out to be Mewis Duct and propeller boss cap fin (PBCF) that together provided more than half of total savings. Both technologies were tested together and separately to conclude that combination of both is the best investment.

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In MMT we have been involved from start to finish: we have done the scoping, initial design, yard selection and also the testing on sea trial. It is exciting to run projects like this one.
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Maarten Nijland, Senior Naval Architect and Project Manager in MMT

Regarding lowering electrical consumption, new 2W energy-saving LED light bulbs were installed in parts of the accommodation and the engine room. When it comes to re-using produced heat, an auxiliary engine economiser was installed. This is in essence a waste heat recovery boiler mounted behind an auxiliary engine reducing the need to use the oilfired boiler to produce steam.

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Waste heat recovery is known from main engines, but with the economiser it can also be applied to auxiliary engines. Combined result was 10% savings in fuel as measured through Maersk Maritime Technology's in-house developed Maersk Ship Performance System. Having in mind that newly built vessels offer savings between 10% and 15%, Eco Retrofit proves to be a beneficial investment.