ts801DNV船级社入级规范2006版.pdf

RULES FORCLASSIFICATION OFDET NORSKE VERITASVeritasveien 1,NO-1322 Hvik,Norway Tel.:+47 67 57 99 00 Fax:+47 67 57 99 11SHIPSIACS COMMON STRUCTURAL RULESPART 8 CHAPTER 1COMMON STRUCTURAL RULES FOR DOUBLE HULL OIL TANKERS WITH LENGTH 150 METRES AND ABOVEJANUARY 2006CONTENTSSec.1IntroductionSec.2Rule PrinciplesSec.3Rule ApplicationSec.4Basic InformationSec.5Structural ArrangementSec.6Materials and WeldingSec.7LoadsSec.8Scantling RequirementsSec.9Design VerificationSec.10Buckling and Ultimate StrengthSec.11General RequirementsSec.12Ship in Operation Renewal Criteria App.AHull Girder Ultimate StrengthApp.BStructural Strength AssessmentApp.CFatigue Strength AssessmentApp.DBuckling Strength AssessmentINTRODUCTION Comments to the rules may be sent by e-mail to For subscription orders or information about subscription terms,please use Comprehensive information about DNV and the Societys services is found at the Web site http:/Copyright in these Rules is owned by Det Norske Veritas.(Copyright in these Rules is also owned by the other IACS members as at 15 January 2006.Copyright 2006.)Printed in NorwayIf any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas,then Det Norske Veritas shall pay compensation to such personfor his proved direct loss or damage.However,the compensation shall not exceed an amount equal to ten times the fee charged for the service in question,provided that the maximum compen-sation shall never exceed USD 2 million.In this provision Det Norske Veritas shall mean the Foundation Det Norske Veritas as well as all its subsidiaries,directors,officers,employees,agents and any other acting on behalf of DetNorske Veritas.GeneralThe Board approved this new chapter in December 2005.The rules come into force on 1 April 2006.This chapter is valid until superseded by a revised chapter.Supple-ments will not be issued except for an updated list of corrections pre-sented in Pt.0 Ch.1 Sec.3.Pt.0 Ch.1 is normally revised in January andJuly each year.Revised chapters will be forwarded to all subscribers to the rules.Buyers of reprints are advised to check the updated list of rule chap-ters printed in Pt.0 Ch.1 Sec.1 to ensure that the chapter is current.The Rules contain two parts,one part that is for information and doesnot constitute specific requirements and one part giving structuralrules for double hull oil tankers of 150 m or greater.Subjects for information are given in Section 1-Introduction and Sec-tion 2-Rule Principles.Specific rule requirements are given in Sections 3 to 12 and the Ap-pendices.TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS SECTION 1 INTRODUCTION 1 Introduction to Common Structural Rules for Oil Tankers 1.1 General 1.2 Application of Individual Classification Rules 1.3 Guidance on Rule Structure SECTION 2 RULE PRINCIPLES 1 Introduction 1.1 Rule Principles 2 General Assumptions 2.1 General 3 Design Basis 3.1 General 4 Design Principles 4.1 Overall Principles 4.2 Loads 4.3 Structural Capacity Assessment 4.4 Materials and Welding 4.5 Assessment/Acceptance Criteria 4.6 Principle of Safety Equivalence 5 Application of Principles 5.1 Overview of the Application of Principles 5.2 Structural Design Process 5.3 Minimum Requirements 5.4 Load-capacity Based Requirements 5.5 Materials 5.6 Application of Rule Requirements SECTION 3 RULE APPLICATION 1 Notations 1.1 Notations 2 Documentation,Plans and Data Requirements 2.1 Documentation and Data Requirements 2.2 Submission of Plans and Supporting Calculations 3 Scope of Approval 3.1 General 3.2 Classification 3.3 Requirements of National and International Regulations 4 Equivalence Procedure 4.1 General 5 Calculation and Evaluation of Scantling Requirements 5.1 Determination of Scantling Requirements for Plates 5.2 Determination of Scantlings of Stiffeners 5.3 Calculation and Evaluation of Scantling Requirements for Primary Support Members 5.4 Rounding of Calculated Thickness TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS SECTION 4 BASIC INFORMATION 1 Definitions 1.1 Principal Particulars 1.2 Position 1 and Position 2 1.3 Type A and Type B Freeboard Ships 1.4 Coordinate System 1.5 Naming Convention 1.6 Symbols 1.7 Units 1.8 Glossary 2 Structural Idealisation 2.1 Definition of Span 2.2 Definition of Spacing and Supported Breadth 2.3 Effective Breadth of Plating 2.4 Geometrical Properties of Local Support Members 2.5 Geometrical Properties of Primary Support Members 2.6 Geometrical Properties of the Hull Girder Cross-Section 3 Structure Design Details 3.1 Standard Construction Details 3.2 Termination of Local Support Members 3.3 Termination of Primary Support Members 3.4 Intersections of Continuous Local Support Members and Primary Support Members 3.5 Openings 3.6 Local Reinforcement 3.7 Fatigue Strength SECTION 5 STRUCTURAL ARRANGEMENT 1 General 1.1 Introduction 2 Watertight Subdivision 2.1 Watertight Bulkhead Arrangement 2.2 Position of Collision Bulkhead 2.3 Position of Aft Peak Bulkhead 3 Double Hull Arrangement 3.1 General 3.2 Double Bottom 3.3 Double Side 4 Separation of Spaces 4.1 Separation of Cargo Tanks 4.2 Cofferdam Spaces 5 Access Arrangements 5.1 Access Into and Within Spaces in,and Forward of,the Cargo Tank Region SECTION 6 MATERIALS AND WELDING 1 Steel Grades 1.1 Hull Structural Steel 1.2 Application of Steel Materials 1.3 Aluminium Alloys TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS 2 Corrosion Protection Including Coatings 2.1 Hull Protection 3 Corrosion Additions 3.1 General 3.2 Local Corrosion Additions 3.3 Application of Corrosion Additions 4 Fabrication 4.1 General 4.2 Cold Forming 4.3 Hot Forming 4.4 Welding 5 Weld Design and Dimensions 5.1 General 5.2 Butt Joints 5.3 Tee or Cross Joints 5.4 Lapped Joints 5.5 Slot Welds 5.6 Stud Welds 5.7 Determination of the Size of Welds 5.8 Weld for Structures Subject to High Tensile Stresses 5.9 Reduced Weld Size 5.10 End Connections of Pillars and Cross Ties 5.11 Alternatives SECTION 7 LOADS 1 Introduction 1.1 General 1.2 Definitions 2 Static Load Components 2.1 Static Hull Girder Loads 2.2 Local Static Loads 3 Dynamic Load Components 3.1 General 3.2 Motions 3.3 Ship Accelerations 3.4 Dynamic Hull Girder Loads 3.5 Dynamic Local Loads 4 Sloshing and Impact Loads 4.1 General 4.2 Sloshing Pressure in Tanks 4.3 Bottom Slamming Loads 4.4 Bow Impact Loads 5 Accidental Loads 5.1 Flooded Condition TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS 6 Combination of Loads 6.1 General 6.2 Design Load Combination 6.3 Application of Dynamic Loads 6.4 Dynamic Load Cases and Dynamic Load Combination Factors for Strength Assessment 6.5 Dynamic Load Cases and Dynamic Load Combination for Scantling Requirements SECTION 8 SCANTLING REQUIREMENTS 1 Longitudinal Strength 1.1 Loading Guidance 1.2 Hull Girder Bending Strength 1.3 Hull Girder Shear Strength 1.4 Hull Girder Buckling Strength 1.5 Hull Girder Fatigue Strength 1.6 Tapering and Structural Continuity of Longitudinal Hull Girder Elements 2 Cargo Tank Region 2.1 General 2.2 Hull Envelope Plating 2.3 Hull Envelope Framing 2.4 Inner Bottom 2.5 Bulkheads 2.6 Primary Support Members 3 Forward of the Forward Cargo Tank 3.1 General 3.2 Bottom Structure 3.3 Side Structure 3.4 Deck Structure 3.5 Tank Bulkheads 3.6 Watertight Boundaries 3.7 Superstructure 3.8 Miscellaneous Structures 3.9 Scantling Requirements 4 Machinery Space 4.1 General 4.2 Bottom Structure 4.3 Side Structure 4.4 Deck Structure 4.5 Machinery Foundations 4.6 Tank Bulkheads 4.7 Watertight Boundaries 4.8 Scantling Requirements TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS 5 Aft End 5.1 General 5.2 Bottom Structure 5.3 Shell Structure 5.4 Deck Structure 5.5 Tank Bulkheads 5.6 Watertight Boundaries 5.7 Miscellaneous Structures 6 Evaluation of Structure for Sloshing and Impact Loads 6.1 General 6.2 Sloshing in Tanks 6.3 Bottom Slamming 6.4 Bow Impact 7 Application of Scantling Requirements to Other Structure 7.1 General 7.2 Scantling Requirements SECTION 9 DESIGN VERIFICATION 1 Hull Girder Ultimate Strength 1.1 General 1.2 Rule Criteria 1.3 Hull Girder Bending Moment Capacity 1.4 Partial Safety Factors 2 Strength Assessment(FEM)2.1 General 2.2 Cargo Tank Structural Strength Analysis 2.3 Local Fine Mesh Structural Strength Analysis 2.4 Application of Scantlings in Cargo Tank Region 3 Fatigue Strength 3.1 Fatigue Evaluation 3.2 Fatigue Criteria 3.3 Locations to Apply 3.4 Fatigue Assessment Methods SECTION 10 BUCKLING AND ULTIMATE STRENGTH 1 General 1.1 Strength Criteria 2 Stiffness and Proportions 2.1 Structural Elements 2.2 Plates and Local Support Members 2.3 Primary Support Members 2.4 Other Structure 3 Prescriptive Buckling Requirements 3.1 General 3.2 Buckling of Plates 3.3 Buckling of Stiffeners 3.4 Primary Support Members 3.5 Other Structures TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS 4 Advanced Buckling Analyses 4.1 General SECTION 11 GENERAL REQUIREMENTS 1 Hull Openings and Closing Arrangements 1.1 Shell and Deck Openings 1.2 Ventilators 1.3 Air and Sounding Pipes 1.4 Deck Houses and Companionways 1.5 Scuppers,Inlets and Discharges 2 Crew Protection 2.1 Bulwarks and Guardrails 2.2 Tank Access 2.3 Bow Access 3 Support Structure and Structural Appendages 3.1 Support Structure for Deck Equipment 3.2 Docking 3.3 Bilge Keels 4 Equipment 4.1 Equipment Number Calculation 4.2 Anchors and Mooring Equipment 4.3 Emergency Towing 5 Testing Procedures 5.1 Tank Testing SECTION 12 SHIP IN OPERATION RENEWAL CRITERIA 1 Allowable Thickness Diminution for Hull Structure 1.1 General 1.2 Assessment of Thickness Measurements 1.3 Categories of Corrosion 1.4 Renewal Criteria of Local Structure for General Corrosion 1.5 Renewal Criteria of Hull Girder Sectional Properties for General Corrosion 1.6 Allowable Material Diminution for Pitting,Grooving and Edge Corrosion APPENDIX A HULL GIRDER ULTIMATE STRENGTH 1 General 1.1 Definitions 1.2 Application 1.3 Assumptions 1.4 Alternative methods 2 Calculation of Hull Girder Ultimate Capacity 2.1 Single Step Ultimate Capacity Method 2.2 Simplified Method Based on an Incremental-iterative Approach 2.3 Stress-strain Curves-(or Load-end Shortening Curves)3 Alternative Methods 3.1 General 3.2 Methods TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS APPENDIX B STRUCTURAL STRENGTH ASSESSMENT 1 General 1.1 Application 1.2 Symbols,Units and Definitions 2 Cargo Tank Structural Strength Analysis 2.1 Assessment 2.2 Structural Modelling 2.3 Loading Conditions 2.4 Application of Loads 2.5 Procedure to Adjust Hull Girder Shear Forces and Bending Moments 2.6 Boundary Conditions 2.7 Result Evaluation 3 Local Fine Mesh Structural Strength Analysis 3.1 General 3.2 Structural Modelling 3.3 Loading Conditions 3.4 Application of Loads and Boundary Conditions 3.5 Result Evaluation and Acceptance Criteria 4 Evaluation of Hot Spot Stress for Fatigue Analysis 4.1 Application 4.2 Structural Modelling 4.3 Loading Conditions 4.4 Boundary Conditions 4.5 Result Evaluation APPENDIX C FATIGUE STRENGTH ASSESSMENT 1 Nominal Stress Approach 1.1 General 1.2 Corrosion Model 1.3 Loads 1.4 Fatigue Damage Calculation 1.5 Classification of Structural Details 1.6 Other Details 2 Hot Spot Stress(FE Based)Approach 2.1 General 2.2 Corrosion Model 2.3 Loads 2.4 Fatigue Damage Calculation 2.5 Detail Design Standard APPENDIX D BUCKLING STRENGTH ASSESSMENT 1 Advanced Buckling Analysis 1.1 General 2 Advanced Buckling Analysis Method 2.1 General 3 Application and Structural Modelling Principles 3.1 General TABLE OF CONTENTS COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 TABLE OF CONTENTS 4 Assessment Criteria 4.1 General 4.2 Utilisation Factors 5 Strength Assessment(FEM)Buckling Procedure 5.1 General 5.2 Structural Modelling and Capacity Assessment Method 5.3 Load Application 5.4 Limitations of the Advanced Buckling Assessment Method 6 Ultimate Hull Girder Strength Assessment 6.1 General 6.2 Load Application 6.3 Structural Modelling and Buckling Assessment SECTION 1-INTRODUCTION COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 SECTION 1 INTRODUCTION SECTION 1-INTRODUCTION COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 SECTION 1.1/PAGE 1 1 INTRODUCTION TO COMMON STRUCTURAL RULES FOR OIL TANKERS 1.1 General 1.1.1 Applicability 1.1.1.1 These Rules apply to double hull oil tankers of 150m length and upward classed with the Society and contracted for construction(1)on or after 1 April 2006.1.1.1.2 Generally,for double hull tankers of less than 150m in length,the Rules of the individual Classification Society are to be applied.1.1.1.3 Ships contracted for construction before the effective date of these Rules are to comply with the Rules of the individual Classification Society.Note The“contracted for construction”date means the date on which the contract to build the vessel is signed between the prospective owner and the shipbuilder.For further details regarding the date of“contracted for construction”,see IACS Procedural Requirement(PR)No.29.1.2 Application of Individual Classification Rules 1.2.1 Regions of the ship which these Rules do not cover 1.2.1.1 For regions of the structure which these Rules do not cover,the relevant requirements of the individual Classification Societys Rules are to be applied.1.3 Guidance on Rule Structure 1.3.1 Framework 1.3.1.1 The Rules are structured in Sections giving instructions for detailed application and requirements which are applied in order to satisfy the Rule objectives.The acceptable procedures for the structural analysis required by the Rules are given in the Appendices.1.3.2 Numbering and cross-references 1.3.2.1 The system for numbering of Sections and Sub-Sections is given in Table 1.1.1.Table 1.1.1 Section Numbering Order Levels Example 1 Section name(displayed in the header)SECTION 1-INTRODUCTION 2 Sub-Section 1 INTRODUCTION TO THE COMMON STRUCTURAL 3 Sub-Section 2 1.1 General 4 Sub-Section 3 1.1.1 Development of the rules 5 Paragraph number 1.1.1.1 An important part of the classification process is the development of rule 1.3.2.2 The system for the numbering of Tables and Figures is given in Table 1.1.2.SECTION 1-INTRODUCTION COMMON STRUCTURAL RULES FOR OIL TANKERS JANUARY 2006 SECTION 1.1/PAGE 2 Table 1.1.2 Numbering of Tables and Figures Table location in document Example of numbering Section 5,Sub-Section 1,2nd table in sub-section Table 5.1.2 Section 1,Sub-Section 12,5th table in sub-section Table 1.12.5 Section 10,Sub-Section 4,3rd table in sub-section Table 10.4.3 Figure location in document Section 5,Sub-Section 1,2nd figure in sub-section Figure 5.1.2 Section 1,Sub-Section 12,5th figure in sub-section Figure 1.12.5 Section 10,Sub-Section 4,3rd figure in sub-section Figure 10.4.3 1.3.2.3 Cross-references are g