1 IACS Common Structural Rules INTERTANKO LATIN AMERICAN PANEL Rio de Janeiro, 25 April 2006.

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IACS Common Structural Rules

INTERTANKO LATIN AMERICAN PANEL

Rio de Janeiro, 25 April 2006

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Aim

To develop a set of unified Rules and Procedures for the determination of the structural requirements for oil tankers and bulk carriers

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Objective

To eliminate competition between class societies with regard to structural requirements and standards

To ensure that a vessel meeting these new standards will be recognised by industry as being at least as safe and robust as would have been required by any of the existing Rules

To fully embrace the intentions of the anticipated IMO requirements for goal based new construction standards

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Why new rules?

Today’s ships are satisfactory, however, ship structural Rules need improvement

The ship rules do not have a clear and rational link between requirements for newbuildings and operation

The ship rules are not in line with state-of-the-art in safety regulations for other segments, e.g., offshore, nuclear, aviation

The ship rules have not kept up with design development in terms of use of technology

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Aspects associated with “robustness” and “durability” deal with items that change over the life of the vessel, such as:

Corrosion – ensuring that corrosion is addressed using clear corrosion margins that are linked to the original strength assessment

Fatigue – ensuring that fatigue is assessed using a harsh environment and sufficient design life (25 years in the North Atlantic)

Review of structural components for relevant assessment criteria (or failure modes), such as:

Material yielding, compressive buckling, member tripping, etc.

Addressing “robustness”

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IACS Common Structural Rules

CSR for Bulk Carriers BV, CCS, GL, KR, NK, RINA & RS

Complete set of Structural Rules for SSS and DSS Bulk Carriers

Length greater than or equal to 90m

CSR for Tankers LRS, ABS & DNV

Complete Set of Structural Rules for Double Hull Oil Tankers

Length greater than or equal to 150m

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Features of the new Common Structural Rules

Rules are to result in common scantling requirements

Net scantling approach includes a clear link between newbuilding strength checks and in-service gauging review standards

Include coating standard criteria

Fatigue standard enhanced to include exposure to North Atlantic environment with minimum life of 25 years

Includes the results from industry input and feedback

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 CSR Features - Net Scantling Approach

Predicted corrosion

in 2.5 years (0.5 mm)

RequiredNet

Thickness

CorrosionAddition

Design

RequiredRenewalThickness

WastageAllowance

In Service

Annual ThicknessMeasurements

includes link between newbuilding and in-service standards

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As-built and renewal thicknesses to be indicated in the vessel drawings

Renewal values given in millimeters (not percentage of as-built)

Renewals cover general corrosion as well as local pitting, grooving and edge corrosion

CSR Features – Renewal Criteria

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Noted work being undertaken by the IMO to amend SOLAS Regulation II-1/3-2

Introduced a “Performance Standard for Protective Coatings for Ballast Tanks and Void Spaces” into the CSRs

CSRs tied to the IMO process Will be mandatory for ships contracted for construction

on or after the date of the IMO adoption of the amended SOLAS Regulation II- 1/3-2

This requirement will effectively advance the date of implementation for tankers and bulk carriers (adoption is not expected before December 2006 at the earliest)

CSR Features – Coating Performance Standard

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IMO Coating Performance Standards (CPS)Earliest Implementation Schedule for SOLAS and IACS CSR

RevisedSOLAS II-1/3-2 entry into force mandating CPSfor shipswith keel laidon/after 01 Jul 08

Draft CPS(DE 49)

SOLAS XII/6.3 enters into force recommending CPS for Bulk Carriers

Approval of CPS and SOLAS II-1/3-2(MSC 81)

Adoption of CPS and Revised SOLAS II-1/3-2 (MSC 82)

IACS CSR requires CPS for shipscontracted for construction on/after the adoption date of the Revised SOLAS II-1/3-2

2007(Jan)

2006(Jan)

2008(Jan)

2 3 4 5 6 7 8 9 10 11 12 2 3 4 5 6 7 8 9 10 11 12 2 3 4 5 6 7

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IACS PR 29 – Contract date and sister vessels

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IACS PR 29 – Contract date and sister vessels

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Where to get more information

ABS Support for CSR:

www.eagle.org

CSR Tanker:

www.jtprules.com

CSR Bulk Carrier:

www.jbprules.com

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Maintenance Plan IACS Hull Panel

• Inquiry replies, Rule amendments, interpretations• Consistent implementation

Tanker and Bulk Carrier Teams• Technical expertise

Harmonization Plan One year feedback period before long term harmonization Three years of harmonization work One year for implementation Full harmonization in five years from implementation

CSR Maintenance and Harmonization

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CSR Tankers

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CSR/Tanker - Table of Contents

Section Topic1

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3

4

5

6

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Introduction

Underlying Principles

Rules Applications

Basic Information

Structural Arrangement

Material and Welding

Loads

Scantling Requirements

Section Topic

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10

11

12

A

B

C

D

Design Verification

Buckling and Ultimate- Strength

General Requirements

Renewal Criteria (SiO)

Hull Girder Ultimate Strength

Structural Strength Assessment

Fatigue Strength Assessment

Buckling Strength Assessment

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Ship Details

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Summary Approx. steelweight changes

As-built cargo block steelweight in

Tonnes

JTP compliant cargo block steelweight in

Tonnes

Tonnes increase

Percentage increase

VLCC 1 28403 29203 800 +3%

VLCC 2 26306 27335 1029 +4%(1)

SUEZMAX 12609 13445 836 +7% (1)

AFRAMAX 2 9919 10399 480 +5%

PANAMAX 1 7454 7697 243 +3%

PRODUCT 1 5467 5599 132 +3%

PRODUCT 2 4347 4606 259 +6%

(1) plating has not been optimised