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Additional resources for Design and operation of tankers : [International Conference on Design and Operation of Tankers ; 8 - 9 June 2011, Athens, Greece ; papers]

Example text

17 © Onboard-Napa L d Figure 9: The small blue arrows represent a traditional pilot chart current forecast Figure 10: Modern daily ocean current forecast For an example the route presented in the previous chapter is optimized with earlier mentioned NAPA Power system taking the weather forecast into account. As a result we see that with the same 14 knot average speed reaching the destination at the same time as earlier © 2011: The Royal Institution of Naval Architects estimated the fuel consumption would be possible to reduce from 854 tons to 839 tons.

E. the Dynamic Sea Margin. Please note that the amount of fouling shown in the figure is of the growth in resistance from the beginning of the study. Figure 2. Total propulsion energy used by the tanker during the study period 5. CONCLUSIONS Sailing with a VLCC at the optimal trim brings about fuel efficiencies and enables the crew to react to prevailing conditions as well as continually monitor and make adjustments to the trim based on real time information. Also, by analyzing the propulsion energy breakdown as well as large amount of logged performance related data across legs, management can continuously monitor their fleets with a consistent view of improving energy performance and reducing emissions.

Will energy efficiency modifications to the hull and the propeller arrangements be advantageous? TYPICAL TANKER CONDITION PROPULSION A sampling of over 300 tankers and 1,000 tanker-years with regard to performance losses due solely to hull and propeller condition is shown in Figure 1 [16]. The speed loss is in reference to the trial trip performance. The Total Excess FOC means the fuel penalty due to basic hull roughness in addition to marine growth at present day. The Fuel Saved if Hull and Prop Cleaning Today is the estimated recovery of fuel losses (at design speed and design draft) assuming a full cleaning of hull and propeller in water.

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