Tripartite MeetingTripartite Meeting

Beijing, 1 November 2005Beijing, 1 November 2005

IMO GBSIMO GBS

Classification Society’s View about the Classification Society’s View about the Scope, Verification Process and Scope, Verification Process and

Acceptance CriteriaAcceptance Criteria

Roberto P. Cazzulo, RINARoberto P. Cazzulo, RINAChairman of IACS EG/GBSChairman of IACS EG/GBS

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

FunctionalRequirements

Goals

IMO

GB

S

(ref. MSC78/6/2)

3

Expectations for New Buildings

Shipping Industry• Fit for purpose• User friendly

Public / Regulators• Safe • Environmentally Friendly

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

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

Individual Ships

Tier V Applicable Industry Standards & Codes of Practice

Tier IV Prescriptive Regulations & Class Rules

Goal-Based Regulatory Framework

Tier II FunctionalRequirements

Tier I Goals

Tier III

IMO

GB

S

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

FunctionalRequirements

Goals

(ref. MSC80/WP.8)

8

IMO GBS Tier II - Functional Requirements

Structural strength

• Ships should be designed with suitable safety marginssafety margins1. 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.

• The structuralstructural strengthstrength 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

FunctionalRequirements

Goals

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

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IMO GBS Tier II - Functional Requirements

Residual strength

• Ships should be designed to have sufficient strength1. to withstand the wave and internal loads in specified damaged specified damaged

conditionsconditions, such as collision, grounding or flooding; and

2.2. actual foreseeable scenariosactual foreseeable scenarios should be investigated in this regard as far as reasonably practicable.

• ResidualResidual strengthstrength 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

FunctionalRequirements

Goals

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IMO GBS Tier II - Functional Requirements

NetNetThicknessThickness

CorrosionCorrosionAdditionAddition

CoatingCoating

Protection against corrosion

• Measures to protect ships against corrosion should be applied to ensure that the net scantlingsnet scantlings required to meet the structural strength provisions are maintained throughout the specified design lifespecified design life, including

– CoatingsCoatings, 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 additionsCorrosion 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

IMO GBS ? - Safety Acceptance Criteria

A > RA > RA > RA > R

13

IMO GBS ? - Safety Acceptance Criteria

0E+00

1E-04

2E-04

3E-04

4E-04

5E-04

6E-04

7E-04

8E-04

9E-04

1E-03

Gener

al ca

rgo

vess

el

Bulk c

arrie

r (inc

l. Ore

carri

er)

LPG ca

rrier

LNG

carri

er

Fish

ing ve

ssel

Conta

iner v

esse

l

Car C

arrie

r

Tank

er fo

r Che

mica

l

Tank

er fo

r che

mica

l/oil

Reefe

r

Offsho

re ve

ssel

Tank

er, S

ingle

Hull*

Ro-Ro/

carg

o ve

ssel

Tank

er, D

ouble

Hul

l*

RoPax

vess

el

Cruise

vess

el

Ind

ivid

ual

ris

k p

er p

erso

n y

ear

Other

Wrecked/strandedFoundering

Fire/ explosion

Occupationalaccident

Proposed level from i.e. MSC 72/16

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IMO GBS Tier III – Verification Criteria

Tier III

Procedures and Quality Systems

Prescriptive Requirements, Rules & Industry Standards

Verification Process

FunctionalRequirements

Goals

Goa

l-Bas

ed R

egul

atio

nsIn

du

stry

Sta

nd

ard

s

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

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IMO GBS Tier III – Verification Criteria

Statutory Requirements

Statutory Requirements

Class Rules

Class Rules

Industry Standards

Industry Standards

IMO GBS Tier II – Functional RequirementsIMO 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)

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)

CONSTRUCTION • Quality procedures (II.10)

• Survey of new buildings (II.11)

SHIPS-IN-SERVICE

• Maintenance (II.12)

• Structural accessibility (II.13)

SHIPS-IN-SERVICE

• Maintenance (II.12)

• Structural accessibility (II.13)

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IMO GBS Tier III – Verification Criteria

Class Class RulesRules

Class Class RulesRules

• TEXT OF THE RULES • TEXT OF THE RULES

• BENCHMARK CALCULATIONS• BENCHMARK CALCULATIONS

• BACKGROUND DOCUMENTATION • BACKGROUND DOCUMENTATION

IMO IMO GBSGBS

IMO IMO GBSGBS

• RULE COMMENTARY REPORT• RULE COMMENTARY REPORT

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IMO GBS Tier III – Verification Criteria

Class Class RulesRules

Class Class RulesRules

• RECOGNISED ORGANISATIONS • RECOGNISED ORGANISATIONS

• IMO• IMO

• FLAG ADMINISTRATIONS • FLAG ADMINISTRATIONS

IMO IMO GBSGBS

IMO IMO GBSGBS

• ALL INTERESTED PARTIES• ALL INTERESTED PARTIES

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Draft Common Rules for Hull Structures

Joint Bulker ProjectJoint Bulker Project

- SSS and DSS Bulk Carriers- Length greater than or equal to 90m

Joint Tanker ProjectJoint 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

FunctionalRequirements

Goals

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