IHI To Employ New Hull Form On 223,000-Dwt Bulk Carrier
Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo, Japan, recently received an order to build a 223,000-dwt energysaving coal/ore carrier from Kumiai Sanpaku Co., Ltd., a domestic shipowner.
The ship will have a newly developed hull form and the SSG (Super-economical Shaft Generator) Mark II system which is expected to reduce fuel consumption by up to 50 percent as compared with the 130,000-dwt energy saving ore carrier Pioneer Maru, built by IHI in 1978.
To be built with a long-term charter from Kawasaki Steel Corporation, the ship will be completed in January 1983, and operated by Japan Line, Ltd.
The ship size will be the maximum allowable for ports of call in Japan, Australia, South Africa, Europe, and North and South America.
The use of very large hull dimensions and slower ship's speed considerably reduces the wavemaking resistance of a ship's hull but increases the frictional resistance.
Accordingly, IHI engineers developed a hull form, termed the "IHI-L.V. hull form," which reduces the resistance. The hull has no bulb at the bow and incorporates a stern shape which reduces energy loss by improving the water flow.
The propulsion machinery will consist of two IHI-Sulzer 7RLB56 type diesel engines with one shaft and reduction gear. A clutch mechanism between the propulsion machinery and the reduction gear will enable the ship to operate on one engine.
Another feature of the ship will be the adoption of the SSG Mark II system. In the system, a turbogenerator is coupled mechanically to the main engine and when the turbine output exceeds the onboard electricity demand, excess power from the turbogenerator is transmitted to the propulsion system and if the turbogenerator output is too low, it can be assisted by the main engine.
The SSG Mark II system also employs a three-stage evaporation type exhaust gas economizer, a mixed pressure steam turbine, and a charging air economizer.
Principal particulars of the ship are: length between perpendiculars, 299 meters (about 981 feet) ; breadth, 50 meters (164 feet) ; depth, 26.65 meters (87 feet) ; draft, 19.82 meters (about 65 feet) ; deadweight, 223,600 tons; gross tonnage, 113,000; main engines, two IHI-Sulzer 7RLB56 type diesel engines (with one shaft) developing an output of 18,900 hp at 164/67.5 rpm; service speed at full load, 13 knots.
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