Page 31: of Maritime Reporter Magazine (May 2001)

firmed that the Ax-Bow can reduce a ship's sea margin by 20 to 30 percent.

The bulk carrier is to be delivered in

June 2001.

The team found that, in order to decrease the diffraction of waves at the bow, it is necessary to reduce the blunt- ness of the bow shape, especially above the still waterline. To design the opti-

Ro-Clean Desmi Sets World

Record For Largest Oil

Containment Boom

Ro-Clean Desmi A/S of Denmark has been offi- cially awarded the Guinness World Record for developing the largest offshore oil contain- ment boom in the world. Known as the R0-

BOOM 3500 this boom has an overall height of 11.5 ft. (3.5 m). Traditionally offshore booms have only been around 6.5 ft. (2 m) in height.

This unusually large boom was developed for use in the Norwegian sector of the North Sea in Europe where the sea conditions are espe- cially harsh with waves reaching up to 23 ft. (7 m). RO-BOOM 3500 has an overall deflated width of 3.5 m, an operational freeboard of 4 ft. (1.3 m) and a draft of 5 ft. (1.5 m).

The operational performance of this boom was tested extensively in the North Sea more than three years, and the oil retention abilities were confirmed with underwater cameras.

A typical system comprises of 1,312 ft. (400 m) of R0-B00M 3500 wound onto a specially developed hydraulic reel that can store, deploy and recover this massive boom. The boom is inflated using an ultra high capacity air blower. The system is completed with a specially designed set of towing equipment that includes a transverse bridle for the for- mation a skimmer pocket.

RO-BOOM 3500 oil containment boom is man- ufactured from heavy-duty neoprene rubber with a Hypalon external skin. This unique one- piece molded composite construction has complete cross vulcanization of rubber and reinforcing fabrics. The construction has high abrasion resistance, peel resistance and ten- sile strength. RO-BOOM lies completely flat when deflated allowing for easy cleaning and storage. The individual air chambers provide high integrity. RO-BOOM is fitted with stainless steel fittings and a hot galvanized ballast/tension chain. Stainless steel hinge connectors are fitted as standard.

Circle 38 on Reader Service Card

May, 2001 mum bow shape under various practical restrictions, an estimation method of added resistance due to wave consider- ing hull shape above the waterline is needed.

One solution formulated was the

Beak-Bow, so named for its similarity to the appearance of a bird's beak. It entailed a sharp and extended triangular shaped bow above the waterline, which served to effectively reduce wave resis- tance.

From a practical standpoint, however, it in some cases added too much length to the ship. For example, in the case of a 170,000-dwt bulk carrier, the ship length became 984 ft. (300 m) with the

Beak-Bow, which made the ship, by reg- ulation for its size/type, 36 ft. (11 m) too long to enter a European port. The shape was then modified to form the Ax-Bow, a bow shaped modified to shape the waterline as sharp as possible, keeping the profile of the bow as a solid line. It also, by nature of its shorter profile, helps to ensure that ships stay within length regulations. r

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