INTERTANKO
Latin American Panel
Lima, Peru
13 – 14 September 2010
IMO
GOAL-BASED SHIP
CONSTRUCTION STANDARDS
Gary Horn
Director, Structures & Hydrodynamics Dept.
ABS Houston
1
Presentation Outline

History

Goal-Based Standards (GBS)

The prescriptive approach

The safety level approach

Harmonized Common Structural Rules
(CSR)
2
GBS History

IMO Member States decided to establish GBS
for ship design and construction

First presented in 2002 at MSC 76

Adopted in 2010 at MSC 87

Will apply to oil tankers and bulk carriers
starting in 2016
(Note, Class Rules will incorporate GBS starting in
early 2014)
3
Goal-Based Standards
● IMO GBS is a high-level list of goals which are stated in
order to provide overall guidance for the development
of Rules and Standards.
● The IMO GBS contains multi-layers (tiers) that provide
greater detail information as one goes from one level to
the next.
● The GBS is intended for developers of Rules or
Standards and is not a Rule or Standard itself, GBS is
a set of “Rules for Rules”.
● Designers will then apply the classification Rules and
Standards.
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Goal-Based Standards
“Rules for the rules”
● If Class Rules and Industry Regulations satisfy GBS, and
vessels are constructed to Class Rules and Industry
Regulations; than vessels satisfy GBS
● Class Rules have to be verified as complying with GBS
(i.e. Tier III verification)
Generic GBS Guidelines
● IMO drafting a generic guideline for developing GoalBased Standards
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Goal-Based Standards
Prescriptive Format:
 Applicable to Oil Tankers 150m in length and above
and Bulk Carriers 90m in length and above
 Tier I (Goals)
 Tier II(Functional Requirements)
 Tier III (Documentation and Verification Criteira
Guidelines)
 Ship Construction File
SLA Format
 Terms of Reference
 Collect info on current safety levels
 Definitions of categories
 Develop long-term work plan
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GBS Prescriptive Format
IMO Documents
 Amendments to SOLAS Chapter II-1 making the GBS
standards for bulk carriers and oil tankers mandatory
[Adopted IMO Res. MSC 290 (87)]

International Goal-Based Ship Construction Standards for
Bulk Carriers and Oil Tankers
[Adopted IMO Res. MSC 287 (87)]

Guidelines for Verification of Conformity with Goal-Based
Ship Construction Standards for Bulk Carriers and Oil
Tankers
[Adopted IMO Res. MSC 296(87)]

Guidelines for the Information to be included in a Ship
Construction File (SCF)
[Approved MSC.1/Circ.1343]
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GBS Prescriptive Format
Tier I
Tier II
Goals
IMO
Functional
Requirements
Tier III
Verification and
Acceptance criteria
Tier IV
Requirements, Rules and
Industry Standards
Tier V
Procedures and Quality Systems
IMO
IMO
IACS
Industry
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GBS Prescriptive Format
Basic Principles

IMO goal-based standards 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 recognized
organizations, Administrations and IMO
clear, demonstrable, verifiable, long standing,
implementable and achievable, irrespective of ship
design and technology
specific enough in order not to be open to differing
interpretations
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GBS Prescriptive Format
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.
Goals
Functional
Requirements
Verification &
Acceptance criteria
Requirements, Rules &
Industry Standards
Procedures and Quality Systems
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GBS Prescriptive Format
Tier II – Functional Requirements







25 year design life
North Atlantic environment
Suitable safety margins at net
scantlings
25 year fatigue life in North Atlantic
Sufficient residual strength
Protection against corrosion
Coating design life specified
Goals
Functional
Requirements
Verification &
Acceptance criteria
Requirements, Rules &
Industry Standards
Procedures and Quality Systems
11
GBS Prescriptive Format
Tier II – Functional Requirements









Adequate corrosion margins
Structural redundancy
Watertight and weathertight integrity
Design transparency
Construction quality procedures
Construction survey
Survey and maintenance
Structural accessibility
Recycling
Goals
Functional
Requirements
Verification &
Acceptance criteria
Requirements, Rules &
Industry Standards
Procedures and Quality Systems
12
GBS Prescriptive Format
Tier III – Verification


Part A – Verification Process
Part B – Information / Documentation and
Evaluation Criteria
Goals
Functional
Requirements
Verification &
Acceptance criteria
Requirements, Rules &
Industry Standards
Procedures and Quality Systems
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Safety Level Approach (SLA)
Basic Principles

Will quantify the acceptable level of safety for an
envisaged rule or regulation by e.g. comparison of an
attained safety level with a required safety level

A minimum safety level that all ships, regardless of
age, will have to comply with

The minimum safety level should be defined by IMO

Will enable an assessment of the envisaged rule or
regulation to be developed in an efficient and reliable
manner defined to overcome any observed
deficiencies.
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Safety Level Approach (SLA)
Work Plan

Determination of current safety levels in a holistic high
level manner for individual ship types (for Tier I goals)

Consideration of previous FSA studies for use in the
development of the SLA (for risk acceptance criteria)

Consideration of an appropriate tier structure for use in
the SLA approach
16
CSR Harmonization Project

CSR (Common Structural Rules) developed
separately for Tankers and Bulk Carriers

IACS agreed to harmonize the rules, which is
currently in progress.

Key elements such as wave loads, fatigue, finite
element analysis and buckling.

Harmonized CSR will consist of three parts − a
common part and two separate parts for ship type
specific requirements.
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CSR Harmonization Project
Project Teams:

Loads

Buckling

FEM

Corrosion

Welding

Fatigue of Hatch Cover

Ships in Operation

Fatigue

Prescriptive Requirements

Consequence Assessment
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CSR Harmonization Project
Schedule:

The schedule for the harmonization project is now
tied to submission of the Rules to IMO GBS
verification.

Schedule covers both the development phase and
the Industry Hearing (implementation) phase.

New schedule calls for an accelerated development
phase and a longer external hearing phase.
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CSR Harmonization Project
Schedule:
Item
Start
End date
External review - Round 1
(include industry presentations)
1 Nov 2012
31 Jan 2013
Rule re-work
1 Feb 2013
28 Feb 2013
External review - Round 2
(include industry presentations)
1 Mar 2013
31 Mar 2013
Rule re-work
1 Apr 2013
30 Apr 2013
Class TC review
15 May 2013
15 Jun 2013
IACS Adoption
30 Jun 2013
30 Jun 2013
Submit to IMO GBS
31 Dec 2013
31 Dec 2013
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Q&A

History

Goal-Based Standards (GBS)

The prescriptive approach

The safety level approach

Harmonized Common Structural Rules
(CSR)
21
www.eagle.org
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