Page 51: of Maritime Reporter Magazine (August 1983)

Deck Machinery (continued from page 49 )

MacGREGOR-NAVIRE

INTERNATIONAL

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Formed following the acquisi- tion of MacGregor International by Kone Oy, of Finland, which al- ready owned Navire Cargo Gear

International, this new company is a major force in the area of cargo access equipment and systems.

Both partners have developed numerous designs of specialized equipment including, in the area of deck machinery, all manner of hatch covers. The range of covers designed vary from units for the largest bulk, OBO, and ore/oil car- riers down to the smallest inland waterway vessel.

Recent innovations for folding covers on medium sized vessels have included the self-engaging auto cleat and the gravity cover.

The self-engaging auto cleat sys- tem uses angular interlocks, or wedges, on the cover side/coaming and at the cross joints to form the cleats. It has been incorporated in the "Direct Pull," "Foldtite," and "Foldlink" cover designs.

The gravity cover uses wedge line positioners each side of the meeting panels to ensure constant compression while the wheel arms at the leading edge of the panels engage catch devices on the coam- ing top rails. The end hinges allow lateral movement but can still act as battening hinges together with the center hinge. With this design, only four manual cleats are re- quired for a hatch, drastically re- ducing securing time.

An area of development for in- land waterway vessels and barges has been telescopic covers which effectively concertina when opened.

There are designs for two and three panel sets of lightweight construction and available as wa- tertight or raintight units. Others now include a light alloy version significantly lighter than those in steel and with a reduced mainte- nance requirement. This alloy de- sign is raintight and being lighter, large panel sizes can still be man- handled while the power require- ment for driven panels is reduced.

One of the most innovative ideas to emerge in recent years involv- ing hatch covers is their use as cranes. In particular, a system has been developed for vessels without cranage so that they can handle 'tweendeck pontoon covers. Called the rolling crane hatch cover, this unit can be rolled along the weatherdeck coaming like a gan- try crane.

Not only is it a straight pontoon cover, it is equipped on the under- side with winches and a cable hoist arrangement whereby a 'tweendeck cover panel can be lifted, transported, and stowed. A recess in the top of the cover con- tains controls and a seat for the crane driver.

Equally valuable to an owner is the possibility of using 'tweendeck pontoon covers as portable parti- tions. This approach has been used on a recent vessel, the 5,780 dwt

Stephan J. A Ro-Ro/containership, this vessel has 14 'tweendeck pon- toon cover panels. Four of these panels can be used as partitions, standing upright on the tank top.

On the largest of dry cargo ves- sels, side rolling covers are pre- dominant. Much original work in this area has been carried out, in- cluding development of rack and pinion drive. The latest versions of the system enable one man to

Write 183 on Reader Service Card open up a nine-hatch ship in un- der 30 minutes, exclusive of un- battening.

Seals are also important and the unique "Hydroseal" system over- comes even the largest amount of movement between the cover and its coaming by maintaining the pressure of the gasket frame against the coaming.

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MENOMINEE, MICHIGAN, U.S.A. 49S58

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R. W. FERNSTRUM & CO., EXPORT DEPT.

MENOMINEE, MICHIGAN, U.S.A. 49858

Phone (906) 863-5553 • Telex 26-3493 • Answer Back FERNSTRUM MNOM

August 1, 1983 Write 820 on Reader Service Card 51