Page 32: of Maritime Reporter Magazine (March 1997)

TANKER TECHNOLOGY 14,000-dwt chemical carrier, whose closely-guarded design draws on know-how from the Tanker Class 2000 program.

Redundancy is a widely dis- cussed theme in the industry today, but relatively few large, cargo carrying ships incorporate what can properly be described as redundant propulsion systems.

The tendency in new crude carriers towards service speeds one or two knots higher than that offered by earlier tonnage has seen larger amounts of power put through sin- gle shaft, single screw installa- tions, although nothing like on the scale seen in the wider-than-Pana- max containership sector.

All the more significant, there- fore, is the fact that one prominent

Scandinavian fleet operator is con- sidering the use of two diesel engines and twin screws for an envisaged class of Aframax new- buildings. Moreover, Atlantic

Richfield fleet subsidiary Arco

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Drew

Marine Division

Ashland Chemical

Ashland Chemical Company

Division of Ashland Inc. © Copyright 1996, Ashland Inc. All rights reserved. ® Registered Trademark, ™ Trademark, Ashland Inc. * Registered service mark of Chemical Manufacturers Assoc. 40 Circle 242 on Reader Service Card

Marine is planning to adopt twin propellers, twin rudders and two completely redundant propulsion and electrical systems in a new class of tanker for the U.S. Pacific seaboard trade.

The double-hulled design, to be developed with Maritech funding by Arco in conjunction with

National Steel & Shipbuilding Co., is intended as a replacement class for single-hulled tankers trans- porting crude oil from Alaska to refineries on the West Coast.

Through its New York affiliate,

MAN B&W Diesel is assisting with engine room design aspects of the project. Electric propulsion is cen- tral to a seminal new class of ves- sel, the multi-purpose shuttle tanker (MST), constructed in

South Korea to the specific design requirements of the Norwegian state energy group Statoil. The 103,000-dwt Berge Hugin consti- tutes an advance in offshore tanker technology, raising

Samsung Heavy Industries' profile as a builder of value-added ton- nage, and providing the market with a versatile class of ship to support the development of mar- ginal oil fields.

The MST concept embodies sub- merged turret loading (STL) and submerged turret production (STP) technologies, and an advanced dynamic positioning (DP) system which includes the use of twin tunnel thrusters in the bow and a retractable, azimuthing thruster in the afterbody.

In standard format, the MST can be used in a shuttle tanker or float- ing storage and offloading (FSO) role, while lending itself to rapid and economic adaptation for pro- duction duties as an floating pro- duction, storage and offloading (FPSO) unit. Thus, after an open- ing year of service in the North Sea from around March this year,

Berge Hugin is to be retrofitted with an STP swivel and processing equipment for FPSO deployment on BP's Pierce field in 1998.

Given follow-on contracts from

Statoil for two such ships in vari- ous configurations, plus options on three more, Samsung is looking to continuity in MST construction for several years ahead. Encapsula- ting Statoil's expertise as the world's largest operator of shuttle tankers, and as an innovative, far- sighted energy group, Berge Hugin points the way in offshore tanker design, conferring an unparalleled degree of operating flexibility and productivity in a single ship.

Maritime Reporter/Engineering News