Page 41: of Maritime Reporter Magazine (May 1994)

Tanker Technology

The benefits, according to ABS, are many and include: • reduced risk of structural failure, • safer, longer-lived tanker struc- tures, • lower life cycle maintenance and repair costs, • more effective use of steel.

Final Report

Upon completion of the survey and analysis work a final report is issued, including: a summary of gen- eral findings and facts noted during the condition survey of the vessel's hull, machinery and equipment as defined in the work plan; a detailed list of all structural and mechanical components surveyed with their corresponding rating and related written description in conjunction with photographs; results from the

SafeHull Structural Evaluation ad- dressing the current vessel condi- tion of the tanker with regard to strength, fatigue and buckling; iden- tification of critical areas in con- junction with the current condition of the tanker and the projected char- acteristics of these areas for the period of interest as defined by the client; and recommendations for present and future structural en- hancements for consideration by the owner to ensure continued service- ability and the hull structure.

For additional information on the applications of the SafeHull System for both newbuilds and existing ves- sels, from ABS,

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Sulzer Diese

The restated criteria in the guides will also include design criteria to assist the designer in the selection of initial design scantlings, which will be checked against the evalua- tion criteria, and can allow for a more streamlined ABS review pro- cess and a more rapid means for exploring innovative designs while maintaining safety and efficiency.

SafeHull: Its Application

For Existing Vessels

As originally envisioned, the fo- cus of SafeHull was for new vessels.

However, during the product's de- velopment ABS clearly recognized its potential value for existing tank- ers.

This led to, at the beginning of this year, the introduction of the

SafeHull System for use with exist- ing tankers.

Called ABS SafeHull Condition

Assessment Services, it can apply advanced, dynamic-based structural evaluation criteria to assess corro- sion and fatigue on the strength of a tanker structure.

Utilizing this information, criti- cal areas can be identified and solu- tions regarding structural enhance- ment can be made.

Administered by the affiliate ABS

Services Inc. (ABS MS), the Assess- ment Service offers two packages.

One package comprises three el- ements—Condition Assessment

Survey, Verification of Gaugings and Structural Evaluation and Rec- ommendations.

The second package focuses on the third element, which is based on

SafeHull technology.

In the Condition Assessment Sur- vey, an ABS survey team conducts a survey to assess the condition of the vessel's hull structure, machinery, piping, electrical systems, boilers and accommodations.

The survey also examines the extent of steel wastage, as well as the condition of coating and corro- sion systems.

To correctly gauge global and lo- cal hull strength, accurate thick- ness measurements are necessary.

Once completed and accepted by

ABS, the information is utilized in the SafeHull Structural Evaluation.

Using vessel gauging informa- tion, the SafeHull evaluation is con- ducted based on a comparison of its "as built" condition with up-to-date gaugings utilizing the same state- of-the-art ABS SafeHull criteria as that used for new vessel design.

Buckling, strength, ultimate strength and fatigue assessments are included in the evaluation.

Dependable power for your ships

May, 1994

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RTA-series low-speed engines 1480-48600 kW

ZA40S medium-speed engines 3600-12960 kW

S20 medium-speed engines 420-1440 kW