Development of 115K Tanker Adopting Baltic Ice Class 1A

摘要

There are very few numbers of 115K FPP (Fixed Pitch Propulsion) tankers for the Baltic ice class 1A, because the minimum power requirement of FMA (Finnish-Swedish Maritime Association) results in quite a large engine power and the 40 m breadth is out of calculation range of FMA minimum power requirements. The shipyard has no choice except the increment of the engine power to satisfy FMA minimum power requirement of FMA Rule. In addition, the operation cost, efficiency of hull form and its building cost may not be attractive to the ship owners. To solve these problems, the experience of ice breaking tanker development and the ice tank test results were adopted. The main idea to reduce the ice resistance is to decrease the waterline angle at design load waterline. The implicit aims of the main idea are to reduce the ice-clearing force. Two hull forms were developed to satisfy the rule corresponding to the Baltic Ice class 1A. Two ice tank tests and one towing tank test were performed at MARC (Kvaener-Masa Arctic Research Center) and SSMB (Samsung Ship Model Basin) facilities, respectively. The purposes of these tests in two different model basins were to verify the performance in ice and open water respectively. The Hull 2 shows less speed loss than the Hull 1 in open water but the tests revealed the Hull 2 to have a very good ice clearing ability. Finally the Hull 2 satisfied the Baltic ice class 1A. The merit of this hull form is to use the same engine capacity and no major design changes in hull form and other related designs. The hull structure, however, has to be changed according to the ice class grade. The several combinations of different engine type and size with her propeller were applied to obtain the suitable set of engine and propeller. These results reveal that smaller engine and the present propeller can satisfy the Baltic ice class 1A based on ice model test results. The differences of two hull form development methods, ice model test and analysis methods, application skill of different engines and propellers will be described in this paper.