Mewis Duct Offers 5% Fuel Savings

Becker Marine Systems has delivered the largest Becker Mewis Duct ever made with a diameter of 8.10 m for the construction of Very Large Crude Oil Carriers (VLCC) at Hyundai Samho Heavy Industries for Samco Shipholding, Singapore.

According to Becker, initial sea trials of the new VLCC with a length of 319.0 m have proven power savings provided by the duct.  Fuel savings of about 5 % were measured, lowering operating costs for the lifetime of the ship. These fuel savings also reduce CO2 emissions by 2,800 t per year for each VLCC.

The German company said that the perfect ship sizes for its ducts range from 30,000 to 320,000 dwt.

Among other energy saving devices (EDS), Becker claims its Mewis Duct is the only solution combining the three principles of ESD’s in a non-linear interaction: wake field equalisation, reduction of hub vortex and contra-rotating swirl.

Hyundai Mipo Dockyard has ordered four ducts for an Italian owner, and two more for an owner from Monaco. Also STX has ordered the first three ducts for a 50,000 dwt bulk carrier for a Danish owner and four for a Greece owner.

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