Page 56: of Maritime Reporter Magazine (May 2004)

Deck Machinery & Cargo Handling Equipment

Research Winches for R/V Maria S. Merian

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Seven special winches were supplied by Hatlapa in

December 2003 after being tested and demonstrated in the fac- tory. These winches are intended for the new research vessel

Maria S. Merian, which will support the vessel Polarstern dur- ing operations in the Arctic.

Hatlapa has escorted this project for five years, during which time the design of the winches was formed in close coopera- tion with the order principal BAW (Bundesanstalt fur

Wasserbau) and the shipyard Krogerwerft in Rendsburg.

One specialty is the combination of friction and storage winch for handling the very long and relatively thin measuring cables. The advantage is that the sensitive and expensive research ropes can be spooled on the storage winch free from load. The pull is created in the friction part and exerted via several grooved drums to protect the rope. A spooling device which has been developed and patented by Hatlapa also guar- antees that the rope is wound onto the storage winch in a clean and gentle manner. Thereby the crossing of rope layers result- ing in rope breakages are avoided. The storage winches have a very large drum diameter for realizing low bending radii of rope when wound on for protecting the sensitive measuring wires in the ropes.

As already mentioned, the ropes are not just normal synthet- ic or steel wire rope, but consist of a single cable with an outer coating of synthetic material to protect the conductor against damage, to guarantee the necessary shielding, and to absorb the forces. Constant communication is possible between the control and measuring instruments by transmission rings in the winch, also during paying-out and hauling-in the rope.

Furthermore, lighting conductor cables are in use which have a similar structure, allowing also constant communication between the control and measuring instruments.

By using frequency inverter controlled motors the speed can be infinitely variably controlled and the winches operated absolutely synchronously. The otherwise usual maximum demands on the shipboard power supply, the ropes and mechanics are eliminated, because the winches are on stand- by from zero speed to full torque, thus allowing a smooth start.

The electric driving capacity of each winch is up to 352 kW that is produced by four motors of each 88 kW. By using four motors capacity reserves are increased on the one hand, and on the other hand the distribution of the load into the gear allows a compact construction. To dissipate the heat arising in the electric motors water cooling has been provided, contrary to the usual air cooling.

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Konecranes Giving Port

Efficiency a Lift

Barbours Cut Terminal recently pur- chased 10 "super" cranes, and the Port

Commission has approved five more.

The original 10 cranes replace - and out- perform - six older cranes that Barbours

Cut had used. "In the first few months, we've gained efficiency and capacity," said Jeff Davis, container operations manager at Barbours Cut. "The

Konecranes are more reliable, and they possess a greater hoist speed." The

Konecranes were delivered in two ship- ments in January and March. The first live were operational by March and the subsequent five went online in May. The six older cranes were retired one at a time as the new Konecranes came online. "These cranes can lift containers faster plus they move at a trolley speed," Davis said. "The wheel turns are a dramatic improvement; these wheels tlip and go, creating a more efficient use of time."

Davis explained that the new cranes have also reduced the amount of time it takes to process incoming and outgoing trucker loads at Barbours Cut. The aver- age truck turn time used to range well over an hour. These days, it's down to just under an hour. "The less time a truck spends at the ter- minal, the quicker it can get on the road and deliver its cargo," Davis said. "The 10 minutes we have gained in the first six months means real dollars to our cus- tomers. And 1 expect we'll experience more time efficiency once we receive the next shipment of five cranes next year."

The Konecranes are able to stack con- tainers four high compared to the retired models, which could only stack three.

That increase in height saves precious yard space at the capacity-strained con- tainer terminal. Paulo Soares, mainte- nance superintendent at Barbours Cut, traveled to Finland to visit the

Konecrane manufacturing facility during the procurement process. He said that he was very impressed with everything he learned during that trip.

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Coastal Marine Wins

ATB Contract

Coastal Marine Equipment. Inc. won a contract to provide the deck machinery for the Penn Maritime ATB being con- structed at Bay Shipbuilding. Equipment for the 140,000 barrel barge includes the 2-3/16-in. stud link anchor windlass with soft rope mooring drum; three double drum wire rope mooring winches; and three 24-in. mooring capstans. All equip- ment is electrically driven and provided with variable frequency drives for multi- 52 Maritime Reporter & Engineering News