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13 June 2014

Article from Tanker Operator

Conferences on the theme ‘Navigating Ecotankers’  took place in Copenhagen on 27th Mar, 2014 – held by Tanker Operator’s.

KNUD E. HANSEN’s Brian Bender Madsen warned owners and operators to anticipate new fuel regulatory changes going forward and agreed that it was generally cheaper to add fuel saving technologies on a newbuilding, rather than opt for a retrofit solution.

He advised owners/operators to co-operate with a proven design house to ensure high overall efficiency, as the shipyards main focus is on optimised production.

Madsen said that there were many solutions available for old, bad and/or large vessels, but for smaller and newer vessels, few solutions are available to improve their efficiency.

He thought that there basically four methods to improve the fuel efficiency of a vessel:

  • Reduce the hull resistance in loaded/ballast condition
  • Increase the propulsion system efficiency
  • Improve the power plant efficiency
  • Improve the crew behavioural and operational efficiency

For newbuildings, a fifth method is the vessel’s operational profile, ie draft, speed, laden/ballast and operation area.

As for hull resistance, the general characteristics of a full-form/high block coefficient vessel, such as a tankers were:

  • 60-80% of the hull resistance is in the form of viscous resistance.
  • 10-20% can be attributed to wave resistance
  • 5-10% to hull roughness
  • Up to 5% to air resistance

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