1. Tripartite Meeting Beijing, 1 November 2005 IMO GBS Classification Society’s View about the Scope, Verification Process and Acceptance Criteria Roberto P. Cazzulo, RINA Chairman of IACS EG/GBS

2. 2 Goal-Based Regulatory Framework Tier I Tier III Tier V Tier IV Tier II Applicable Industry Standards & Codes of Practice Prescriptive Regulations & Class Rules Verification Process Functional Requirements Goals IMO GBS (ref. MSC78/6/2 )

3. 3 Expectations for New Buildings Shipping Industry Fit for purpose User friendly Public / Regulators Safe Environmentally Friendly

4. 4 Basic Principles of the IMO GBS The IMO GBS are: 1. broad, over-arching safety, environmental and/or security standards that ships are required to meet during their lifecycle 2. the required level to be achieved by the requirements applied by class societies and other recognised organisations, Administrations and IMO 3. clear, demonstrable, verifiable, long standing, implementable and achievable, irrespective of the ship design and technology 4. specific enough in order not to be open to differing interpretations.

5. 5 Holistic Approach Opinion expressed by IMO Members The regulatory framework should cover the whole ship safety but focusing for the time being on ship structure

6. 6 Individual Ships Tier V Applicable Industry Standards & Codes of Practice Tier IV Prescriptive Regulations & Class Rules Goal-Based Regulatory Framework Tier II Functional Requirements Tier I Goals Tier III IMO GBS

7. 7 IMO GBS Tier I - Goals Ships are to be designed and constructed for – a specified design life – to be safe and environmentally friendly, – when properly operated and maintained – under the specified operating and environmental conditions, – in intact and specified damage conditions, – throughout their life. Tier I Procedures and Quality Systems Requirements, Rules and Industry Standards Verification process Functional Requirements Goals (ref. MSC80/WP.8 )

8. 8 IMO GBS Tier II - Functional Requirements Structural strength safety margins Ships should be designed with suitable safety margins 1. to withstand at net scantlings, in intact condition, the environmental conditions anticipated for the ship’s design life and the loading conditions appropriate for them, which would include full homogeneous and alternate loads, multi-port and ballast voyage, and ballast management condition loads and occasional overruns / overloads during loading/unloading operations, as applicable to the class designation; and 2. appropriate for all design parameters whose calculations involves a degree of uncertainty, including loads, structural modelling, fatigue, corrosion, material imperfections, construction workmanship errors, buckling and residual strength. structuralstrength The structural strength should be assessed against : – excess deformations – buckling – yielding – fatigue – ultimate strength (of the hull girder, plate and stiffeners) The structural members should be designed to facilitate load/discharge of all contemplated cargoes to avoid damage by loading/discharging equipment which may compromise the safety of the structure. Tier II Procedures and Quality Systems Requirements, Rules and Industry Standards Verification process Functional Requirements Goals

9. 9 Limit States for Structural Rules ULTIMATE LIMIT STATE Yielding, plastic deformations, buckling of hull stiffened panels or other mechanisms leading to loss of intact hull strength SERVICEABILITY LIMIT STATE Conditions (e.g. permanent deformations) due to which the ship cannot perform her intended service ACCIDENTAL LIMIT STATE Loss of residual hull strength for accidental loads (e.g. flooding into internal spaces) FATIGUE LIMIT STATE Fatigue cumulative damage (i.e. crack growth) in structural details due to cyclic stresses

10. 10 IMO GBS Tier II - Functional Requirements Residual strength Ships should be designed to have sufficient strength specified damaged conditions 1. to withstand the wave and internal loads in specified damaged conditions, such as collision, grounding or flooding; and 2. actual foreseeable scenarios 2. actual foreseeable scenarios should be investigated in this regard as far as reasonably practicable. Residualstrength Residual strength calculations should take into account : – ultimate reserve capacity of the hull girder – permanent deformations – post-buckling behaviour. Structural redundancy Ships should be of redundant design and construction so that any localised damage of any structural member will not lead to immediate consequential failure of other structural elements, leading to loss of structural and watertight integrity Tier II Procedures and Quality Systems Requirements, Rules and Industry Standards Verification process Functional Requirements Goals

11. 11 IMO GBS Tier II - Functional RequirementsNetThickness CorrosionAdditionCoating Protection against corrosion net scantlings specified design life Measures to protect ships against corrosion should be applied to ensure that the net scantlings required to meet the structural strength provisions are maintained throughout the specified design life, including – Coatings – Coatings, which should be selected as a function of the intended use of the compartment, materials and application of other corrosion prevention systems. Where coating is required to be applied, the design coating life is to be specified. – Corrosion additions – Corrosion additions, which should be added to the net scantlings and should be adequate for the specified design life, determined on the basis of exposure to corrosive agents and whether the structure is protected by corrosion prevention systems.

12. 12 IMO GBS ? - Safety Acceptance Criteria A > R

13. 13 IMO GBS ? - Safety Acceptance Criteria Proposed level from i.e. MSC 72/16

14. 14 IMO GBS Tier III – Verification Criteria Tier III Procedures and Quality Systems Prescriptive Requirements, Rules & Industry Standards Verification Process Functional Requirements Goals Goal-Based Regulations Industry Standards Procedures for demonstrating and verifying that the rules and referenced industry standards on Tier IV meets the IMO goals and functional requirements on Tier I and Tier II

15. 15 IMO GBS Tier III – Verification Criteria Statutory Requirements Class Rules Industry Standards IMO GBS Tier II – Functional Requirements DESIGN Environmental conditions (II.2) Strength (II.3) Fatigue (II.4) Residual Strength (II.5) Corrosion protection (II.6) Structural redundancy (II.7) Watertight integrity (II.8) CONSTRUCTION Quality procedures (II.10) Survey of new buildings (II.11) SHIPS-IN- SERVICE Maintenance (II.12) Structural accessibility (II.13)

16. 16 IMO GBS Tier III – Verification Criteria Class Rules TEXT OF THE RULES BENCHMARK CALCULATIONS BACKGROUND DOCUMENTATION IMO GBS RULE COMMENTARY REPORT

17. 17 IMO GBS Tier III – Verification Criteria Class Rules RECOGNISED ORGANISATIONS IMO FLAG ADMINISTRATIONS IMO GBS ALL INTERESTED PARTIES

18. 18 Draft Common Rules for Hull Structures Joint Bulker Project - SSS and DSS Bulk Carriers - Length greater than or equal to 90m Joint Tanker Project – Double Hull Oil Tankers – Length greater than or equal to 150m Tier IV Procedures and Quality Systems Requirements, Rules and Industry Standards Verification process Functional Requirements Goals

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