Page 15: of Maritime Reporter Magazine (July 1981)

Figure 1—Tug comparative thrust dia- gram. will be used to transport raw ma- terial for NKK steel works and are scheduled for completion in 1982.

The new design adopts such energy-saving measures as im- proved propulsion efficiency and waste heat recovery. NKK says these measures will reduce fuel consumption by some 40 percent on the ore/coal carrier. The ves- sel will have a propulsion plant that uses the NKK medium-speed

PC engine, together with a 9- meter, controllable-pitch propel- ler.

Another unique feature is the so-called "Shaft-Generator and

Motor (SGM)" system that, af- ter supplying the needs of vari- ous ship sectors, generates sur- plus electricity by use of waste heat from the main engine to the motor directly linked to the main shaft for additional propulsion.

The vessel also will be equipped with measures for improved waste heat utilization, including a boiler water heating system.

The hull design also will con- serve energy in loading and bal- lasting conditions, and will be coated with an antifouling paint below the waterline to reduce viscous resistance as well as ad- herence of marine organisms.

Figure 2 — Changing from pulling to pushing; comparison of maneuvers; con- ventional tug versus reverse tractor;

Z-drive tug.

Pilothouse consoles showing Maritime single lever Z-drive controls. (4.59 meters) ; draft, 13 feet (3.96 meters) ; propeller speed, 300 rpm; and propeller diameter, 86 inches (2.18 meters).

Her main propulsion power is provided by two Fairbanks Morse 38D81/8 diesel engines. Line han- dling is by means of twin Markey capstans.

New NKK Ship Design

Will Reduce Fuel Use

By Some 40 Percent

NKK (Nippon Kokan) has de- veloped a new basic ship design promoting greater energy con- servation, which will be applied to three vessels (two ore/coal carriers and a bulk carrier) being built for Showa Shipping Com- pany and Nippon Yusen. Shin- ichi Hirayama, president of NKK

America Inc., said these vessels

July 1, 1981

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