4th ASF/SNEC – ACS Seminar, Seoul, 22 March 2013

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Presentation transcript:

4th ASF/SNEC – ACS Seminar, Seoul, 22 March 2013 Update of IMO Goal Based Standards (GBS) and IACS harmonized Common Structural Rules (CSR) Takuya Yoneya ACS Liaison with ASF/SNEC IACS SG/CSR Member Executive Vice President, ClassNK

Contents Why IMO GBS and IACS CSR? What is IMO GBS? What is IACS CSR? IACS CSR Harmonisation Time Schedule What about the impact on the ship design? My report today will cover the following content. 1. Firstly, I would like to introduce the “Core Business of Classification Society”, which includes the following content. (1) ClassNK’s Major Events (2) Status as Classification Society (3) Client Service (4) Research & Development 2. Secondly, I would like to introduce our recent “Service for New Conventions” 3. And last, I would like to introduce our recent activities as “New Frontiers”. Now, let me get going on “ClassNK’s Major Events” 2

Why IMO GBS and IACS CSR? GBS: Goal-Based Standards CSR: Common Structural Rules

Serious Casualties Bulk carrier casualties Oil tanker casualties Total loss of bulk carriers resulting in Huge loss of human lives. 200 or more seafarers lost their lives in a single year. My report today will cover the following content. 1. Firstly, I would like to introduce the “Core Business of Classification Society”, which includes the following content. (1) ClassNK’s Major Events (2) Status as Classification Society (3) Client Service (4) Research & Development 2. Secondly, I would like to introduce our recent “Service for New Conventions” 3. And last, I would like to introduce our recent activities as “New Frontiers”. Now, let me get going on “ClassNK’s Major Events” Oil tanker casualties Oil spills involving very old tankers such as the Erika (1999) and the Prestige (2002). Large-scale environmental damage. 4

History of Hull Structural Rules IMO IACS 1980 Double hull construction for oil tankers Performance Standard for Protective Coatings (PSPC) Enhanced Survey Program (ESP) Bulk carrier safety 1990 2000 IMO should be involved in the structural standards of vessels. それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 Respond after accidents Risk aversion in advance Common Structural Rules (CSR) for bulk carriers and oil tankers Re-active Pro-active 2010 Goal-Based Standards (GBS) for new construction of oil tankers and bulk carriers Harmonised CSR 5

What is IMO GBS?

IMO Goal-Based Standards 5 Tiers of GBS Safe and Environment-friendly Vessel それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 7

GBS Tier II - Functional Requirements Design Design life Environmental condition Structural strength Fatigue life Residual strength Protection against corrosion Structural redundancy Water tight and weather tight integrity Human element consideration Design transparency Construction Construction quality procedures Survey In service consideration Survey and maintenance Structural accessibility Recycling consideration Recycling それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 Functional  Requirements 8

GBS Tier IV - Class Rules Class Rules to be compliant with GBS IMO GBS それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 9

What is IACS CSR?

IACS - Harmonized CSR - Schedule and Status IACS Common Structural Rules 2017/4/28 Two sets of IACS Common Structural Rules for Bulk Carriers and Oil Tankers Effective since 1 April 2006 First IACS common rules to fully cover hull structural requirements for new construction of ships Potential to be compliant with IMO GBS 7 years of application to the hull design of bulk carriers and oil tankers Continuous maintenance to address feedback from the industry and others Industry request to harmonise the two sets of CSRs

Prescriptive Regulations IMO GBS Tier II and CSR Covered by non-CSR rules Covered by the CSR Design Design life Environmental condition Structural strength Fatigue life Residual strength Protection against corrosion Structural redundancy Water tight and weather tight integrity Human element consideration Design transparency Construction Construction quality procedures Survey In service consideration Survey and maintenance Structural accessibility Recycling consideration Recycling それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 Functional  Requirements Prescriptive Regulations & Class Rules 12

IACS CSR Harmonisation

IACS CSR Harmonisation Project Harmonise the two sets of CSRs for bulk carriers and oil tankers. Comply with the IMO GBS requirements. Harmonised CSR それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 CSR for Bulk Carriers CSR for Oil Tankers Harmonisation + GBS compliance 14

Harmonized CSR consists of two parts: a common part; and a part containing requirements specific to bulk carriers and oil tankers. Technical key elements such as loads, fatigue, finite element analysis and buckling are harmonized. 15

Basic Principles of Harmonisation To be equivalent to the present CSRs >> No significant increase nor decrease in scantling requirements, in principle In case where any significant scantling impact is inevitable, sufficient technical background, e.g. damage data, is to be provided. Possible impact anticipated due to compliance with GBS requirements.

Part 1: General Hull Requirements Part 2: Ship type Requirements Table of Contents Part 1: General Hull Requirements Part 2: Ship type Requirements Rule General Principles General Arrangement Design Structural Design Principles Loads Hull Girder Strength Hull Local Scantling Direct Strength Analysis Buckling Fatigue Other Structures Superstructure, deckhouse and hull outfitting Construction Ship in Operation – Renewal Criteria Bulk Carriers General Arrangement Design Structural Design Principles Hull Local Scantling Hull Local Scantling for BC for L<150m Cargo Hatch Covers Additional Class Notations GRAB Oil Tankers Hull Outfitting Common to both BCs and OTs Specific to BCs and OTs 17 17

Scope of Application Same application with the current CSR Single and Double Side Skin BCs ≥ 90m Same application with the current CSR Double Hull Oil Takers ≥ 150m Typical examples only, other variations of cross tie and web frame arrangements are also covered. 18

IACS - Harmonized CSR - Schedule and Status General Rule Principles 28/04/2017 Design condition 25 years of Design life North Atlantic Sea Design criteria Net scantling approach Limit state design (yielding, buckling, fatigue, damage) Design verification Hull girder strength (yielding, buckling, ultimate strength) Local strength (minimum thickness, yielding, buckling) Primary structural strength (3D-FEA of whole cargo areas) Fatigue strength (simplified methods for stiffener end connections, 3D-FEA of hot spot areas with very fine mesh) Audience only like to focus on which parts have been changed as compared to previous CSR. Highlight the “parts” that make difference. Acceptance criteria S is new for BC !

Net Scantling Approach Break down “gross required thickness” into “net required thickness” and “corrosion addition” Relate net required thickness to renewal thickness Wastage limit tvol_add (Voluntary addition) As-built thickness tcorrosion (Corrosion addition) Renewal thickness  tnet_req (Net required thickness) 20

Shift to general corrosion Corrosion Additions Corrosion additions are defined as same with those in the current CSRs, based on statistical analysis of thickness measurement data of aged oil tankers and bulk carriers, which include the additional data provided by ICS as well as IACS data. No corrosion occurs when coating condition is “good” Start corrosion wastage “Good ” coating period Age of vessel Proceed in the depth direction during developmental stage Thickness diminution Shift to general corrosion 21

Side shell arrangement Residual Strength Required by IMO GBS Examples of damages being considered Collision Grounding Grounding Collision Side shell arrangement Single side Double side Height 0.75D 0.60D depth B/16 Bulk carriers Oil tankers Height Min.(B/20, 2) Min.(B/15, 2) Breadth 0.60B 22

Finite Element Analysis Analyse Target Holds Scope of assessment is from the Collision BHD to E/R front BHD Scope of assessment Aftmost part Foremost Fore part Mid part Aft part Harmonised CSR Mid part Current CSR Aftmost part Foremost part 23

Fatigue Assessment Upper hopper knuckle Lower hopper knuckle それでは,まずGBSについて説明いたします。 GBSは,SOLAS条約に定められた基準であり,より合理的な手法により船体構造の安全性を担保するための枠組みを定めています。 その枠組みとは,既にご覧になられことのある方も多いと思いますが、 こちらのTier1からTier5、目標、機能要件、適合検証、船級規則、業界標準という5層からなるピラミッドで表されます。 このビラミッドの一番上の層 Tier 1には、[click] 安全で環境に配慮した船舶とすべきという目標が設定され、 Tier 2以下には、この目標を実現するための様々なレベルの基準が定められています。 それでは、Tier 2以下の基準についてもう少し詳しく説明いたします。 Lower hopper knuckle Lower stool Hatch corner 24

Time Schedule of IMO GBS and IACS Harmonised CSR

Industry Review of IACS H-CSR 1st Industry Review Jul. to Dec. 2012 1st IACS presentations to the industry Sep. 2012 2nd Industry Review Apr. to Aug. 2013 2nd IACS presentations to the industry Jun/Jul. 2013 (plan) Final Review Nov. to Dec. 2013 by Tech. Committee of each Class Deliverables: - Draft text of the harmonized CSR - Technical Background - Results of Consequence Assessment

Long-term Time Schedule IMO GBS GBS verification audit by IMO Enter into force 1 July 2016 IACS Harmonised CSR External review period Effective date IACS Current CSR (yet to be decided) 2011 2012 2013 2014 2015 2016 2nd External Review, Apr. to Aug., 2 months extended IACS Adoption of harmonized CSR, Dec. 2013 27

What about the impact of IACS harmonised CSR on the ship design?  will be presented at the Seminar

Thank you for your kind attention! 29