Rules for Classification and Construction IV Industrial ...

1 Rules for Classification and Construction IV Industrial Services 6 Offshore Technology 4 Structural Design Edition 2007 The following Rules come into force on December 1st , 2007 Germanischer Lloyd Aktiengesellschaft Head Office Vorsetzen 35, 20459 Hamburg, Germany Phone: +49 40 36149-0 Fax: +49 40 36149-200 "General Terms and Conditions" of the respective latest edition will be applicable (see Rules for Classification and Construction , I - Ship Technology, Part 0 - Classification and Surveys). Reproduction by printing or photostatic means is only permissible with the consent of Germanischer Lloyd Aktiengesellschaft. Published by: Germanischer Lloyd Aktiengesellschaft, Hamburg Printed by: Gebr der Braasch GmbH, Hamburg Table of Contents Section 1 Environmental Conditions A. Basic Considerations .. 1- 1 B.

2 Wind .. 1- 1 C. Sea Currents .. 1- 2 D. Sea Waves .. 1- 4 E. Sea Level .. 1- 10 F. Climatic Conditions, Temperature and Marine Growth .. 1- 10 G. Sea Ice and Icebergs .. 1- 11 H. Sea Bed .. 1- 11 Section 2 Design Loads A. Basic Considerations .. 2- 1 B. Environmental Loads .. 2- 1 C. Permanent Loads .. 2- 9 D. Functional Loads .. 2- 10 E. Accidental Loads .. 2- 10 F. Transportation and Installation Loads .. 2- 11 G. Earthquake Loads .. 2- 12 Section 3 Principles for Structural Design A. General .. 3- 1 B. Design Methods and Criteria .. 3- 1 C. Loading Conditions .. 3- 3 D. Allowable Stress Design.

3 3- 5 E. Tubular Joint Design .. 3- 6 F. Effective Width of Plating .. 3- 8 G. Buckling .. 3- 8 H. Fatigue Strength .. 3- 23 I. Dynamic Analysis .. 3- 32 Section 4 Steel Structures A. Materials .. 4- 1 B. Fabrication .. 4- 12 C. Welding .. 4- 19 D. Inspection and Testing .. 4- 42 IV - Part 6 GL 2007 Table of Contents Chapter 4 Page 3 Section 5 Concrete Structures A. General .. 5- 1 B. Materials .. 5- 2 C. Verification of Quality .. 5- 3 D. Placing and Curing the Concrete .. 5- 4 E. Formwork and Falsework .. 5- 5 F. Reinforcement .. 5- 5 G. Principles of Calculation.

4 5- 7 H. Calculations for Pre-stressed Structures .. 5- 9 Section 6 Corrosion Protection A. General .. 6- 1 B. Material Selection .. 6- 4 C. Coating Selection .. 6- 8 D. Cathodic Protection .. 6- 11 Section 7 Foundations A. General .. 7- 1 B. Geotechnical Investigations .. 7- 1 C. General Design Considerations .. 7- 1 D. Pile Foundations .. 7- 2 E. Gravity Type Foundations .. 7- 6 Section 8 Cranes and Crane Support Structures A. Scope of Application .. 8- 1 B. Environmental Conditions .. 8- 2 C. Cranes .. 8- 3 D. Crane Support Structures .. 8- 4 E. Tests and Examinations on Site.

5 8- 4 F. Documentation .. 8- 4 Section 9 Helicopter Facilities A. General .. 9- 1 B. Structure of the Helicopter Deck .. 9- 2 C. Helicopter Deck Equipment .. 9- 4 D. Fire Protection and Fire Extinguishing Systems .. 9- 5 E. Aviation Fuel System .. 9- 6 F. Requirements for Winching .. 9- 8 Chapter 4 Page 4 Table of Contents IV - Part 6GL 2007 Section 10 Marine Operations A. General .. 10- 1 B. Standards and Guidelines .. 10- 1 C. Loadout .. 10- 1 D. Transportation .. 10- 3 E. Lifting Operations .. 10- 4 F. Installation Offshore .. 10- 11 G. Other Marine Operations for Marine Warranty Survey .. 10- 13 Annex A Welding and Test Piece Positions Annex B List of Standards, Codes, etc.

6 Quoted IV - Part 6 GL 2007 Table of Contents Chapter 4 Page 5 Index A Accidental loads .. 2-10, 3-4 Admixtures .. 5-2 Aggregates .. 5-2 Air gap .. 2-7 Allowable stress design .. 3-5 Anchor handling .. 10-13 Anode materials .. 6-14, 6-24 Anodes .. 6-15, 6-25 Aviation fuel system .. 9-6 B Bearing capacity .. 7-8 Buckling .. 3-8, 5-8 bar elements .. 3-9 lateral .. 3-18 plane and curved plate panels .. 3-13 shell elements .. 3-21 torsional .. 3-20 C Cable laying .. 10-14 Cargo barge .. 10-3 Cargo handling .. 8-3 Catalogue of details .. 3-34 Categories of structural members .. 4-1 Cathodic protection .. 6-11 anodes .. 6-14 calculation and design procedure .. 6-17 design current densities .. 6-11 galvanic anodes system .. 6-12 impressed current system .. 6-23 location of anodes .. 6-22, 6-25 safety .. 6-23, 6-27 systems.

7 6-12 Cements .. 5-2 Certification of cranes .. 8-1, 8-5 IV - Part 6 GL 2007 Index Chapter 4 Page 7 Classification of cranes .. 8-1, 8-5 Climatic conditions .. 1-10 Coating selection .. 6-8 Collision .. 2-10 Concrete .. 5-2 curing .. 5-4 placing and working .. 5-4 pre-stressed structures .. 5-6, 5-9 principles of calculation .. 5-7 quality .. 5-3 reinforcement .. 5-5 standards and safety concepts .. 5-1 structures .. 5-1 water .. 5-2 Concreting under water .. 5-5 Conductor shielding .. 1-4 Conveyance of persons .. 8-3 Corrosion .. 3-1 Corrosion protection .. 6-1 cathodic protection .. 6-11 coating selection .. 6-8 coatings and coating breakdown factors .. 6-9 high strength steel and corrosion resistant alloys (CRAs) .. 6-6 material selection .. 6-4 metal sheathing .. 6-5 structural design .. 6-4 Crane davits for survival craft/rescue boats.

8 8-3 duties .. 8-1 manual .. 8-4 sea lashing systems .. 8-3 structures .. 8-1 support structures .. 8-4 Crane vessels .. 10-10 Cranes .. 8-1, 8-3, 10-10 Cumulative damage ratio .. 3-28 Current blockage .. 1-3 D Derrick systems .. 8-3 Chapter 4 Page 8 Index IV - Part 6GL 2007 Design criteria .. 3-2 Detail categories .. 3-27 Documentation .. 5-1, 8-4, 9-2 Ductility level earthquake .. 2-12 Dye penetrant inspection .. 4-52 Dynamic analysis .. 3-32 Dynamic positioning .. 10-14 E Earthquake analysis .. 3-33 ductility level .. 3-5 loads .. 2-12, 3-32 Effective width of plating .. 3-8, 3-17 Environmental design conditions .. 1-1, 8-2 Environmental loads .. 2-1 Existing cranes .. 8-4 Extreme environmental loads .. 3-4 F Fabrication .. 4-12 cold and hot forming .. 4-14 deviations, defects and repair work.

9 4-13 fitting and assembly .. 4-14 heat treatment .. 4-15 identification and storage of materials .. 4-13 quality assurance and control .. 4-12 surface and edge preparation .. 4-13 tolerances .. 4-15 Failure Mode Analysis (FMA) .. 8-3 Falsework .. 5-5 Fatigue assessment procedure .. 3-25 Fatigue strength .. 3-23 Fire extinguishing .. 9-6 Fire protection .. 9-5 Formwork .. 5-5 Foundations .. 7-1 design considerations .. 7-1 geotechnical investigations .. 7-1 gravity type .. 7-6 IV - Part 6 GL 2007 Index Chapter 4 Page 9 pile type .. 7-2 Fuel transfer system .. 9-7 Functional loads .. 2-10 G Geotechnical investigations .. 7-1 Global design .. 3-32 Global safety factors .. 5-8 Gravity type foundations .. 7-6 dynamic behaviour .. 7-11 hydraulic instability .. 7-11 installation .. 10-12 installation and removal.

10 7-11 stability .. 7-7 static deformations .. 7-11 Grout .. 5-3, 7-6 Gust wind .. 1-2 H Helicopter data .. 9-1 Helicopter deck arrangement .. 9-1 equipment .. 9-4 structure .. 9-2 Helicopter facilities .. 9-1 Hot spot stress .. 3-26 I Ice accretion .. 2-8, 8-2 Icebergs .. 1-11 Impact .. 2-10 Inspection .. 4-42 methods and extent .. 4-44 personnel, supervisors .. 4-43 standards, codes .. 4-42 testing equipment .. 4-43 Installation loads .. 2-11 Installation offshore .. 10-11 J Jacket installation .. 10-11 Chapter 4 Page 10 Index IV - Part 6GL 2007 JONSWAP spectrum .. 1-6 L Launch .. 10-11 Layout plan for loads .. 2-10 Lift points .. 10-6 Lifting equipment .. 10-10 Lifting operations .. 10-4 Limit damage ratio .. 3-28 Limit states .. 3-2, 5-8 Loading conditions .. 3-3 Loadout .. 10-1 Loads.