Rules for Classification and Construction I Ship Technology

1 Rules for Classification and Construction I Ship Technology 1 Seagoing Ships 6 Liquefied Gas Carriers Edition 2008 The following Rules come into force on 1 July 2008. Alterations to the preceding Edition are marked by beams at the text margin. Germanischer Lloyd SE Head Office Brooktorkai 18, 20457 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 SE.

2 Published by: Germanischer Lloyd SE, Hamburg Table of Contents Section 1 General, Character of Classification , Definitions, Surveys and Certification A. General .. 1- 1 B. Character of Classification , Entries into the Class Certificate, Documents for Approval .. 1- 2 C. Definitions .. 1- 4 D. Surveys and Certification .. 1- 6 E. Emergency Towing Arrangements .. 1- 6 F. Safe Access to Tanker Bows .. 1- 6 Section 2 Ship Survival Capability and Location of Cargo Tanks General .. 2- 1 Freeboard and stability.

3 2- 1 Shipside discharges below the freeboard deck .. 2- 2 Conditions of loading .. 2- 2 Damage assumptions .. 2- 2 Location of cargo tanks .. 2- 3 Flooding assumptions .. 2- 4 Standard of damage .. 2- 4 Survival requirements .. 2- 5 Section 3 Ship Arrangements Segregation of the cargo area .. 3- 1 Accommodation, service and machinery spaces and control stations .. 3- 2 Cargo pump-rooms and cargo compressor rooms .. 3- 2 Cargo control rooms.

4 3- 3 Access to spaces in the cargo area .. 3- 3 Airlocks .. 3- 5 Bilge, ballast and fuel oil arrangements .. 3- 6 Bow or stern loading and unloading arrangements .. 3- 6 Section 4 Cargo Containment General .. 4- 1 Definitions .. 4- 1 Design loads .. 4- 3 Structural analysis .. 4- 6 Allowable stresses and corrosion allowance .. 4- 10 Supports .. 4- 12 Secondary barrier .. 4- 12 Insulation .. 4- 13 Materials.

5 4- 14 Construction and testing .. 4- 15 Stress relieving for type C independent tanks .. 4- 17 Guidance formulae for acceleration components .. 4- 18 Stress categories .. 4- 19 I - Part 1 GL 2008 Table of Contents Chapter 6 Page 3 Section 5 Process Pressure Vessels and Liquid, Vapour and Pressure Piping Systems General .. 5- 1 Cargo and process piping .. 5- 1 Type tests on piping components .. 5- 3 Piping fabrication and joining details .. 5- 3 Testing of piping .. 5- 4 Cargo system valving requirements.

6 5- 4 Ship's cargo hoses .. 5- 5 Cargo transfer methods .. 5- 6 Vapour return connections .. 5- 6 Section 6 Materials of Construction General .. 6- 1 Material requirements .. 6- 2 Welding and non-destructive testing .. 6- 7 Section 7 Cargo Pressure / Temperature Control General .. 7- 1 Refrigeration systems .. 7- 1 Section 8 Cargo Vent Systems General .. 8- 1 Pressure relief systems .. 8- 1 Additional pressure relieving system for liquid level control.

7 8- 3 Vacuum protection systems .. 8- 4 Size of valves .. 8- 4 Section 9 Environmental Control Environmental control within cargo tanks and cargo piping systems .. 9- 1 Environmental control within hold spaces (cargo containment systems other than type C independent tanks) .. 9- 1 Environmental control of hold spaces surrounding type C independent tanks .. 9- 1 Inerting .. 9- 1 Inert gas production on board .. 9- 2 Inertgas plant for liquefied gas carriers above tdw .. 9- 2 Section 10 Electric Installations General.

8 10- 1 [Deleted] .. 10- 1 Bonding .. 10- 1 Chapter 6 Page 4 Table of Contents I - Part 1GL 2008 Section 11 Fire Protection and Fire Extinction Fire safety requirements .. 11- 1 Fire water main equipment .. 11- 1 Water spray system .. 11- 2 Dry chemical powder fire extinguishing systems .. 11- 2 Cargo compressor and pump-rooms .. 11- 3 Fire-fighter s outfits .. 11- 3 Section 12 Mechanical Ventilation in the Cargo Area Spaces required to be entered during normal cargo handling operations .. 12- 1 Spaces not normally entered.

9 12- 2 Section 13 Instrumentation (Gauging, Gas Detection) General .. 13- 1 Level indicators for cargo tanks .. 13- 1 Overflow control .. 13- 2 Pressure gauges .. 13- 2 Temperature indicating devices .. 13- 2 Gas detection requirements .. 13- 3 Section 14 Personnel Protection Protective equipment .. 14- 1 Safety equipment .. 14- 1 First aid equipment .. 14- 1 Personnel protection requirements for individual products .. 14- 1 Section 15 Filling Limits for Cargo Tanks General .. 15- 1 Information to be provided to the master.

10 15- 1 Section 16 Use of Cargo as Fuel General .. 16- 1 Arrangement of machinery spaces of Category A .. 16- 1 Gas fuel supply .. 16- 1 Gas make-up plant and related storage tanks .. 16- 2 Requirements for gas fired main boilers .. 16- 3 Special requirements for diesel/gas engines and gas turbines .. 16- 3 Testing of pipings .. 16- 4 I - Part 1 GL 2008 Table of Contents Chapter 6 Page 5 Section 17 Special Requirements General .. 17- 1 Materials of Construction .. 17- 1 Independent tanks .. 17- 1 Refrigeration systems.