Guidance Manual for Tanker Structures - 2020 Consolidated Edition

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BP101208
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Number of Pages:
445
Book Height:
300 mm
Book Width:
250 mm
Weight:
2.1 kg
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This publication combines into one manual the various sources of information necessary for assessing the condition of ballast and cargo tank structures of tankers in service. It is based on the experience and practices used by members of the Tanker Structure Co-operative Forum and covers survey (TSCF) reparation and execution guidelines, maintenance guidelines and survey data analysis.

This revision includes IACS Recommendation No. 72: Confined Space Safe Practice – Rev.3 Dec 2018 and IACS Unified Requirements (UR) Survey and Certification: Z10.4 Hull Surveys of Double Hull Oil Tankers (Rev.16 May 2019), where changes introduced in Rev.16 are to be uniformly applied by IACS Societies for surveys commenced on or after 1 July 2020.

The first section of the book focuses on survey of tanker structures, commencing with preparations for survey, including safety and access requirements. It sets out survey execution guidelines for the various types of survey, including guidance on ultrasonic thickness detection and the types of defect that might be identified. It then looks at analysis of survey data, in particular identification of corrosion trends and potential risk areas. Finally, guidance is provided on maintenance and repairs that should be undertaken to maintain structural integrity and prevent degradation.

The second section outlines general design aspects of double hull tankers, including strength and statutory considerations, and identifies specific areas within the structural arrangement that may be vulnerable to stress concentration, fatigue, corrosion, etc. Additional information is provided on damages to other types of double hull ships in service. The book then discusses protection of the internal structures from corrosion and the necessary permanent access facilities that need to be incorporated into the ship at the time of build to ensure that adequate inspection, monitoring and maintenance can be carried throughout the service life of the ship.

This manual combines in one document the various sources of information necessary for assessing the condition of ballast and cargo tank structure of tankers in service, mainly addressing the conventional single hull tanker. The manual is based on the experience and practices of members of the Tanker Structure Co-operative Forum consisting of Owners, Operators and Classification Societies.

This consolidated edition combines in one guidance manual the various sources of information necessary for assessing the condition of ballast and cargo tank structure of tankers in service. While the original manual mainly addressed the conventional single hull tanker, this revision includes IACS Recommendation No. 72: Confined Space Safe Practice – Rev.3 Dec 2018 and IACS Unified Requirements (UR) Survey and Certification: Z10.4 Hull Surveys of Double Hull Oil Tankers (Rev.16 May 2019), where changes introduced in Rev.16 are to be uniformly applied by IACS Societies for surveys commenced on or after 1 July 2020.

Part One – Guidance Manual for Tanker Structures

Introduction to the 1997 Edition

Introduction to the 2020 Consolidated Edition

1. Survey Preparation Guidelines

1.1 Survey Requirements

1.2 Safety and Access

1.3 Ultrasonic Thickness Determination

1.4 Technical Background for Surveys

2. Survey Execution Guidelines

2.1 Introduction

2.2 General Planning Requirements

2.3 Structural Aspects

2.4 Risk Categories

2.5 Classification Society Surveys/IACS Unified Requirements for Hull Surveys of Double Hull Oil Tankers

2.6 Owner’s Surveys

3. Survey Data Analysis Guidelines

3.1 Method of Assessment

3.2 Structural Integrity

3.3 Acceptance Criteria

4. Maintenance and Repair Guidelines

4.1 General

4.2 Type of Repair

4.3 Maintenance and Repair Methods

4.4 Optimum Maintenance and Repair Strategy

Bibliography

Appendix I – Background to Forum Activities

Appendix II – IACS Unified Requirements UR Z10.4

Appendix III – IACS Rec No. 72: Confined Space Safe Practice

Appendix IV – Catalogue of Structural Detail Failures

Appendix V – In-Service Corrosion Rate Studies

Appendix VI – Structural Inspection Guidelines

Appendix VII – Assessment of Existing Surface Coating Systems

Appendix VIII – Forms and Procedures/On Board Documentation

Part Two – Guidelines for the Inspection and Maintenance of Double Hull Tanker Structures

1. Introduction

2. Design Aspects of Double Hull Tankers

2.1 Definition

2.2 Nomenclature

2.3 Cargo Tank Arrangement

2.4 Materials

2.5 Arrangement of Primary Structure Below 20,000 Dwt

2.6 Arrangement of Primary Structure up to 150,000 Dwt

2.7 Arrangement of Primary Structure Above 150,000 Dwt

2.8 Areas Requiring Special Attention

3. Critical Areas in Double Hull Tankers

3.1 General

3.2 Stress Concentration Locations in Primary Structure

3.3 Misalignment During Construction

3.4 Corrosion Trends

3.5 Fatigue Considerations

3.6 Areas in Double Hull Tankers Requiring Special Attention

4. Experience on Structural Defects in Double Hulls

4.1 General

4.2 Defects in Double Hulls

5. Corrosion Protection Considerations

5.1 General

5.2 Legislative Requirements for Corrosion Protection

5.3 Choice of Corrosion Protection

5.4 Typical Coating Systems

5.5 Quality Standards for Coating of Double Hull Spaces

5.6 Typical Defects of Coating Systems

5.7 Planning, Supervision and Guarantees

5.8 Recommendations for New Construction

6. Design Considerations in Accessibility for Inspection and Maintenance

6.1 General

6.2 Visibility Requirements

6.3 Accessibility Requirements for Double Hull Spaces

6.4 Access Methods for Inspection

6.5 Ventilation and Inerting Requirements for Double Hull Spaces

7. Survey of Structure

7.1 General

7.2 Types of Inspection and Objectives

7.3 Planning and Preparation for Inspection

7.4 Execution of Survey

7.5 Reporting

7.6 Post Inspection Analysis of Survey Data

8. Maintenance and Repair

8.1 General

8.2 Type of Repair

8.3 Maintenance and Repair Methods

8.4 Optimum Maintenance and Repair Strategy

References

Appendix 1 – Catalogue of Structural Detail Failures in Double Hull Designs

TSCF

The Tanker Structure Co-operative Forum (TSCF) is an informal technical body whose membership is voluntary and comprised of Oil Companies, Independent Owners/Operators and Classification Societies who will actively contribute to the TSCF’S Mission.

The mission of the TSCF is to advance maritime safety through improvements in the design and maintenance of tanker structures. This is achieved by sharing technical knowledge and experience in order to gain a better understanding of the safety performance of tanker structures in service. Specific topic areas of interest include corrosion, structural defects, inspection procedures, and criteria for determining renewal of damaged or corroded structure.

The TSCF is committed to sharing accumulated experience on tanker structures with the marine industry. This is achieved through prompt public release of technical manuals and information papers, and proceedings of TSCF Shipbuilder’s Meetings.

http://www.tscforum.org/AboutTSCF/interim.aspx

Number of Pages:
445
ISBN:
9781856098670
Binding Format:
Hardback
Book Height:
300 mm
Book Width:
250 mm
Weight:
2.1 kg
Author:

TSCF