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. 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.

2 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 .. 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.

3 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 .. 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.

4 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 .. 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.

5 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 .. 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.

6 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 .. 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.

7 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 .. 17- 1 Deck cargo piping .. 17- 1 Exclusion of air from vapour spaces .. 17- 1 Moisture control .. 17- 2 Inhibition .. 17- 2 Permanently installed toxic gas detectors .. 17- 2 Flame screens on vent outlets .. 17- 2 Maximum allowable quantity of cargo per tank.

8 17- 2 Submerged electric cargo pumps .. 17- 2 Ammonia .. 17- 2 Chlorine .. 17- 3 Diethyl ether and vinyl ethyl ether .. 17- 4 Ethylene oxide .. 17- 4 Isopropylamine, monoethylamine .. 17- 5 Methyl acetylene-propadiene mixtures .. 17- 5 Nitrogen .. 17- 6 Propylene oxide and mixtures of ethylene oxide/propylene oxide with ethylene oxide content of not more than 30 % by weight .. 17- 6 Vinyl chloride .. 17- 8 Section 18 Operating Requirements Cargo information .. 18- 1 Compatibility .. 18- 1 Personnel training .. 18- 1 Entry into spaces .. 18- 1 Carriage of cargo at low temperature .. 18- 2 Protective equipment .. 18- 2 Systems and controls .. 18- 2 Cargo transfer operations .. 18- 2 Additional operating requirements.

9 18- 2 Section 19 Summary of Minimum Requirements Explanatory Notes to the Summary of Minimum Requirements .. 19- 1 Annex A Guidelines for the Evaluation of the Adequacy of Type-C Tank Vent Systems Chapter 6 Page 6 Table of Contents I - Part 1GL 2008 Section 1 General, Character of Classification , Definitions, Surveys and CertificationA. General 1. These Rules apply to ships having their ma-chinery aft and built for the carriage in bulk of lique-fied gases and some other products which are listed in Section 19. 2. In addition to these Rules the relevant re-quirements of Part 0 - Rules for Classification and Surveys and the relevant requirements of Chapter 1 Hull Structures, Sections 1 through 22 and 24 apply. 3. For the machinery, the electrical plant and the refrigerating installation of these ships, the Chapters 2 Machinery Installations, 3 Electrical Installations and 4 Automation apply.

10 4. The Rules of this Chapter incorporate the IMO-Resolution (48) "International Code for the Construction and Equipment of Ships carrying liquefied Gases in Bulk" (IGC-Code), 1993 edition, as amended. 5. Certain requirements of the IGC-Code that are not within the scope of Classification , para. 6. "Equivalents", Section 14, "Personnel Protection", certain operational requirements in Section 17 "Spe-cial Requirements" and Section 18 "Operating Re-quirements" have been included in these Rules . Except for para. 6. and for operational requirements as mentioned above they will, however, be applied in such instances where .1 the Society is authorized by Administrations to issue on their behalf the "Certificate of Fitness for the Carriage of Liquefied Gases in Bulk" or where .2 the Society is authorized to carry out investiga-tions and surveys on behalf of Administrations on the basis of which the "Certificate of Fitness for the Carriage of Liquefied Gases in Bulk" will be issued by the Administrations, or where.