Page 9: of Maritime Reporter Magazine (May 1985)

Mitsui Delivers Big Ore Carrier

With Many Energy-Saving Features

The 197,060-dwt ore carrier Asa- kasan Maru, built at the Chiba

Works of Mitsui Engineering &

Shipbuilding Company (MES), was delivered recently to joint owners

Mitsui O.S.K. Lines and Sawayama

Kisen Kaisha, Ltd. The big vessel has an overall length of 984.25 feet, beam of 164 feet, depth of 79 feet, and full-load draft of 58.5 feet. She is powered by a slow-speed Mitsui/

B&W 7L80MCE diesel engine with a maximum continuous output of 20,700 bhp at 80.8 rpm. On sea trials the ship attained a speed of 16.35 knots.

A special feature of the new ore carrier is the superstructure located aft, which is shaped like a compact, streamlined tower. Such tower- shaped superstructures have been used by MES in the past for the construction of only four vessels— three tankers built in 1965 for Fred

Olsen of Norway, and another in 1968 for Anders Wilhelmsen &

Company, also of Norway. Reflect- ing the current increasing need for energy efficiency in ships, use of this unusual type of superstructure to reduce air resistance is now attract- ing renewed interest.

The Japan Marine Machinery

Development Association, taking note of the advantage of this super- structure design, in 1981 set up a research subcommittee to study the resistance of offshore structures to wind pressures. As the effects of the tower-shaped superstructures had not been fully assessed in numerical terms, the subcommittee carried out research and investigation in vari- ous aspects, both theoretically and experimentally.

Participating in this research pro- ject, MES was commissioned to con- duct an experimental study on the effect of reduced resistance on com- pact, streamlined superstructures on ships. With the cooperation of her co-owners, such a superstruc- ture was incorporated into the de- sign of the Asakasan Maru.

A Mitsui ATG-V turbogenerator

May 1, 1985 system (mixed-pressure turbine sys- tem) is installed for maximum utili- zation of the waste heat of the main engine exhaust. The ship is also equipped with a thyristor conver- tor-invertor type shift generator (that can be used as an emergency propulsion motor), and a power management system for maximum effective utilization of the turbogen- erator's output.

Other energy-saving features in- clude a Mitsui Integrated Duct Pro- peller, a reaction rudder, and exten- sive use of high-tensile steel in the hull structure. The hull bottom and waterline area are coated with self- polishing antifouling. Windlasses, mooring winches, and deck washing system are fitted with remote con- trol systems with a view to reducing the crew's workload. The engine control room and cargo control room are integrated for more ration- al performance of the duties of both.

The engine room is designed for unmanned operation, and has ob- tained NK's "MO-A" notation. •

Wartsila And M.A.N.-B&W

Sign License Agreement

Oy Wartsila Ab and M.A.N.-

B&W Diesel A/S recently signed a license agreement concerning the manufacture of diesel engines at Oy

Wartsila Ab, Turku Diesel Works.

The license covers the right to man- ufacture M.A.N.-B&W two-stroke low-speed diesel engines to be mar- keted to Finnish yards.

The conclusion of this license agreement means that Oy Wartsila

Ab joins the M.A.N.-B&W diesel two-stroke license family which worldwide comprises more than 25 members.

For literature containing full in- formation,

Circle 38 on Reader Service Card

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