Tripartite MeetingBeijing, 1 November 2005IMO GBSClassification Society’s View about the Scope, Verification Process and Acceptance CriteriaRoberto P. Cazzulo, RINAChairman of IACS EG/GBS
Goal-Based Regulatory Framework Tier I Tier II Functional Requirements Tier III Goals Verification Process Tier IV Tier V Applicable Industry Standards & Codes of Practice Prescriptive Regulations & Class Rules IMO GBS (ref. MSC78/6/2)
Expectations for New Buildings • Public / Regulators • Safe • Environmentally Friendly • Shipping Industry • Fit for purpose • User friendly
Basic Principles of the IMO GBS The IMO GBS are: • broad, over-arching safety, environmental and/or security standards that ships are required to meet during their lifecycle • the required level to be achieved by the requirements applied by class societies and other recognised organisations, Administrations and IMO • clear, demonstrable, verifiable, long standing, implementable and achievable, irrespective of the ship design and technology • specific enough in order not to be open to differing interpretations.
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
Goal-Based Regulatory Framework Tier IIFunctional Requirements Tier IGoals Tier VApplicable Industry Standards & Codes of Practice Tier IVPrescriptive Regulations & Class Rules Individual Ships IMO GBS Tier III
IMO GBS Tier I - Goals Tier I Functional Requirements Goals Verification process Requirements, Rules and Industry Standards Procedures and Quality Systems 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. (ref. MSC80/WP.8)
IMO GBS Tier II - Functional Requirements Functional Requirements Tier II Goals Verification process Requirements, Rules and Industry Standards Procedures and Quality Systems Structural strength • Ships should be designed with suitable safety margins • 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 • 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. • The structuralstrength 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.
IMO GBS Tier II - Functional Requirements Functional Requirements Tier II Goals Verification process Requirements, Rules and Industry Standards Procedures and Quality Systems Residual strength • Ships should be designed to have sufficient strength • to withstand the wave and internal loads in specified damaged conditions, such as collision, grounding or flooding; and • actual foreseeable scenarios should be investigated in this regard as far as reasonably practicable. • Residualstrength 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
IMO GBS Tier II - Functional Requirements Coating Corrosion Addition Net Thickness Protection against corrosion • 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, 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, 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.
IMO GBS ? - Safety Acceptance Criteria Proposed level from i.e. MSC 72/16
IMO GBS Tier III – Verification Criteria Functional Requirements Tier III Goals Verification Process Procedures and Quality Systems Prescriptive Requirements, Rules & 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 Goal-Based Regulations Industry Standards WHAT? HOW? BY WHOM?
IMO GBS Tier III – Verification Criteria WHAT? 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) Statutory Requirements Class Rules Industry Standards
IMO GBS Tier III – Verification Criteria HOW? IMO GBS Class Rules • TEXT OF THE RULES • BACKGROUND DOCUMENTATION • BENCHMARK CALCULATIONS • RULE COMMENTARY REPORT
IMO GBS Tier III – Verification Criteria BY WHOM? IMO GBS Class Rules • RECOGNISED ORGANISATIONS • FLAG ADMINISTRATIONS • IMO • ALL INTERESTED PARTIES
Draft Common Rules for Hull Structures Functional Requirements Goals Verification process Tier IV Requirements, Rules and Industry Standards Procedures and Quality Systems Joint Tanker Project • Double Hull Oil Tankers • Length greater than or equal to 150m Joint Bulker Project • SSS and DSS Bulk Carriers • Length greater than or equal to 90m