Page 30: of Maritime Reporter Magazine (September 1981)

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Cargo Handling

Equipment— Hagglunds (continued from page 31) product like an Arctic crane is manufactured only in small num- bers, but this is disputed by one of Hagglunds biggest orders. On

December 12, 1980, Wartsila's

Turku Shipyard in Finland gave an order to Hagglunds' deck ma- chinery division confirming the yard's intention to cooperate with

AB Hagglund and Soner in a ma- jor new building project consist- ing of nine ships designed for polar conditions. The order calls for 45 cranes to be delivered be- tween December 1981 and Decem- ber 1982.

Another indication of Hagg- lunds' continuing concern for quality in its products is its re- search into the optimum design for crane bases.

Simple cylindrical bases give rise to design problems which may be difficult to solve with con- ventional strength calculations. A further difficulty arises in the case of combined cylindrical/ta- pered cone bases in the determi- nation of the stress which can arise at the transition between the cylindrical and tapered parts.

The third type of base is the rec- tangular kind. Design calcula- tions are analogous to those for cylindrical tapered bases, which means that the diaphragm stress- es generated by the crane tilting

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CORPORATION moment are not greatest around the crane axes of inertia. The most difficult type of base from all points of view is the side- located. This base presents all the problems encountered with the others, plus a few more. It is a challenging engineering problem involving FEM (Finite Element

Method) of stress analysis for each individual case. A number of these special crane mounts are now in successful operation.

Another recent product result- ing from research is the Team

Crane®, a further development of the twin crane. In this newest system, two cranes are electric- ally interconnected and synchro- nized automatically, enabling op- eration "in team." The Norwegian

Knutson Line is the owner of the

Maria Bakke, which calls on U.S.

West Coast ports with a "team" of 4 x TG2524 Hagglund cranes.

Total lift capacity of these cranes is 100-ton with a single crane driver controlling the "team" as one machine. The installation of the Team Cranes results in a ves- sel being entirely independent of shore cranes to load or unload.

Hagglund can provide a lift ca- pacity of 240 tons by the instal- lation of four of its 60-ton cranes.

Units supplied as Twin Cranes may also be interconnected for team operation.

For more information and spec- ifications on the full range of

Hagglund hydraulic motors and deck machinery,

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A new 300-ton crane—a P&H 5300-R — was dedicated by the

Port of Milwaukee late last year before invited guests that in- cluded shippers, shipping line of- ficials, City and Port of Milwau- kee officers, and executives of the

Harnischfeger Corporation of

Milwaukee, the crane's manufac- turer. The crane is designed to handle virtually all types of cargo that passes through the Port— containers, heavy lifts to 300 tons, general breakbulk, and scrap.

Based on experience at other ports, the P&H 5300-R is ex- pected to load containers aboard ship at a rate of 25 per hour on deck and 16 to 19 per hour in the hold. This approaches the speed of the huge gantry cranes in use at major ocean ports. This con- tainer-handling capability alone is expected to have a major im- pact on Milwaukee's cargo vol- ume.

The products of Milwaukee's 32 Write 486 on Reader Service Card Maritime Reporter/Engineering News

Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.