Page 46: of Maritime Reporter Magazine (October 1997)

Lloyd's Register Outlines

Challenges Facing High-

Speed Craft

The technical, environmental and human challenges confronting the rapidly expanding high-speed craft industry were recently high- lighted by Chris Wade, managing director of the Marine Division of

Lloyd's Register (LR).

Speaking at FAST '97, the fast sea transportation conference, Mr.

Wade emphasized that, in order to meet these challenges, classifica- tion societies would have to extend their involvement beyond struc- ture and machinery.

According to Mr. Wade the ser- vice experience essential to cali- brate theoretical calculations or to validate model experiments is still limited for larger high-speed craft.

In the formulation of its Special

Service Craft (SSC) Rules, LR has elected to adopt a first principles approach taking account of the environmental envelope for the intended service, the loads to which the craft is subject, the strength assessment and the acceptance criteria. With contin- ued investment in research, Wade feels this philosophy may one day be extended into a load factor and resistance design approach and thereby represent a complete departure from the empirical rules which have been predominant.

High speed craft can be con- structed from an array of materi- als including composites, alu- minum alloys, high tensile steels or, increasingly, a combination of these materials. Concern in this area, according to Mr. Wade, is related to the ability to carry out effective and economic repairs on unforeseen circumstances and in remote locations.

Mr. Wade also suggested that classification societies can and should play an important role in resolving these problems when they arise and, more importantly, prevent their recurrence by intro- ducing rule changes.

Dakota Creek Industries

Chooses Delta T Moisture

Eliminators

Under a contract to provide two high-speed ferries to the City of

Vallejo, Ca., commercial boat builder Dakota Creek Industries chose Delta T Systems to provide salt-and-moisture-free ventilation to the boat's engine rooms.

Each of the two ferries measures 135 ft. (41.1 m) and can carry 300 passengers. Christened Intintoli and Mare Island, the all-alu- minum catamarans feature twin 2,700 hp MTU water jet engines enabling the vessels to achieve a top speed of 32 knots, cutting the trip from Vallejo to San Francisco to 53 minutes — a 10-minute improvement over previous ferry trips. "There are certain wave height requirements that have to be met, and to meet those, these boats have to stay under a certain weight limit," said Mike Snook, engineering manager at Dakota

Creek. "The Delta T vents are one- third the weight of any comparable system and still provide the high- est level of protection from salt spray and moisture."

To supply the large diesel engines adequately, Delta T mois- ture eliminators constructed from polypropylene were chosen. The unique S-shaped slats in these vents are designed to trap mois- ture without interrupting the flow of air. (FAST CRAFT coverage continues with an Australian Review, on page 114)

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BRAZIL, 1996. (not shown) Refloated the 15,000 ton freighter "AL JOHFFA"

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