Ind Presentation CSRH Intro Rule Updates

8/17/2019 Ind Presentation CSRH Intro Rule Updates

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Gary Horn, Chair of IACS Hull PanelPhilippe Baumans and Åge Bøe,

IACS Project Management Team

Hasan Ocakli, PM of Consequence Assessment team

HarmonisedCommon Structural Rules

Project Status

Industry Presentation

June 2013


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IACS Harmonised CSRIndustry Presentations

• Welcome, and thank you forattending

• Safety First

http://www.eagle.org/eagleExternalPortalWEB/appmanager/absEagle/absEagleDesktop?_nfpb=true&_pageLabel=abs_eagle_portal_directory_pagehttp://www.rs-class.org/en/directory/index_rs_directory.phphttp://www.rina.org/EN/istituzionale/dovesiamo.aspxhttp://www.prs.pl/dir21.htmlhttp://www.classnk.or.jp/hp/directory/dir_top.asphttp://www.lr.org/contact_us/office_directory/index.aspxhttp://www.krs.co.kr/eng/intro/organ/I_organ_dir.aspxhttp://www.irclass.org/IRS_directory.pdfhttp://www.gl-group.com/http://www.dnv.com/findus/http://www.crs.hr/en-us/directory.aspxhttp://www.ccs.org.cn/en/CCS_Brief/CCS_Brief2.htmhttp://www.veristar.com/wps/portal/marinedirectory


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Agenda

Topic Presenter

Welcome & Introduction G. Horn

Status1. Schedule2. Industry feedback and rule changes

G. Horn

Changes to the CSR-H since 1-Jul-20121. General Principles

2. Loads3. Hull Girder & Local Prescriptive Reqts4. Direct Strength Analysis5. Buckling Criteria6. Fatigue Strength7. Discussions (Q/A)

P. Baumans Å. Bøe

Consequence Assessment

1. General, scope and method2. Oil Tankers, prescriptive and FEM3. Discussions (Q/A)4. Bulk Carriers, prescriptive and FEM5. Discussions (Q/A)

H. Ocakli

General Discussion (Q/A) All

WelcomeJune 2013 3


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Goal based standards & Harmonised CSR

2010 2011 2012 2013 2014 2015 2016

CSR-OT

CSR-BC

21 Harmonised CSR

External review period

Technical Committee review

IACS adoption

Entry into force

GBS to startapplication tooil tanker andbulker

(1 July 2016)

1July 1Apr.

30 Jun.

CSR-H1st Draft Rules

CSR-H2nd Draft Rules

Deadline of submission to IMO for GBS

verification

( 31 December 2013)

(RCN1 of the 2010 CSRs)

Welcome 4June 2013 4


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CSR-H Schedule

C66 Approved

Schedule

First draft (External) 1 Jul 2012

1st Industry Review 1 Jul – 31 Dec 2012

(6 months)

Feedback/Re-work1 Jan – 31 Mar 2013

(3 months)

Second draft 1 Apr 2013

2nd Industry Review 1 Apr – 31 Aug 2013

(5 months)

Feedback/Re-work1 Sep – 31 Oct 2013

(2 months)

Third (TC) draft 1 Nov 2013

TC Review 1 Nov – 15 Dec 2013 (1.5 months)

IACS Adoption December 2013

Final clean-up 15 Dec – 1 Feb 2014

Release Rules 1 Feb 2014

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2nd Draft of CSR-H Released

Released 1 April 2013 (Website: www.iacs.org.uk) CSR-H Rule Text.

Technical Background.

Consequence Assessment (based on 31-Dec-2012 internal version).

IACS Press Release.

IACS web site modified to suit.

• A working draft showing “track changes” from 1st external release of1-Jul-2012 is available upon request.

“In Progress” items from 1st draft of 1-Jul-2012 addressed as necessaryand labels removed.

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2nd Draft of CSR-H Released

2nd

Industry Review Period 1 April 2013 ~ 31 August 2013

Industry invited to review and comment during the review period,and further advised:

• This period constitutes the last opportunity for "substantive"

review of the draft harmonized CSR.

• There will be a final Technical Committee review of the draftharmonized Common Structural Rules during the period of1 Nov 2013 thru 15 Dec 2013, however, this final review isplanned as a non-substantive confirmation of the Rules.

the reason being the schedule for the submission of the CSR-H toIMO for verification of compliance with the IMO Goal BasedStandards.

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Technical Documentation Package to IMO

CSR-Hdocuments

IACS Common Package, 2nd Part

Other IACSdocuments

(UR, PR, UI, etc.)

IACS Common Package, 1st Part

ABS

BV

CCS

RS

… A letter +

Individual Tech.

Doc. Package

to IMO

R e f e r e n c e s

Note: IACS is working closely with the IMO Secretariat to

coordinate scope and schedule of the GBS

submiss ion package.

WelcomeJune 2013 8


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Detailed Technical Presentations

2nd

round of Industry Presentations:18 June 2013 – Athens

20 June 2013 – London

24 June 2013 – Shanghai

26 June 2013 – Busan

28 June 2013 – Tokyo

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TC Review

Current 2nd

Industry Review Period Now ~ 31 August 2013.

Final TC and Industry Review Period

1 ~ 15 December 2013.

Final review as a non-substantive confirmation of the Rules.

Final adoption by IACS Council during mid-December 2013.

Ready for the submission of the CSR to IMO for verification of

compliance with the IMO Goal Based Standards.

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Time schedule

• Schedule

• Knowledge Centre

• IACS Organisation


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Harmonised CSR - Time Schedule

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IACS Knowledge Centre

June 2013

IACS knowledge centre address: http://www.iacs-csrkc.org.uk

Industry contact through: [email protected]

►Accessible by anyone

►Comments and questions received from

Industry

►Answers provided by IACS groups

(HPTs, PMTs, Hull panel, etc )

0

20

40

60

80

100

120

J u l 2 0 1 2

A u g 2 0 1 2

S e p 2 0 1 2

O c t 2 0 1 2

N o v 2 0 1 2

D e c 2 0 1 2

J a n 2 0 1 3

F e b 2 0 1 3

M a r 2 0 1 3

A p r 2 0 1 3

M a y 2 0 1 3

J u n 2 0 1 3

Questions Received

Total 300 Q

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IACS CSR Organisation

June 2013

IACS Council

SG/CSR(ABS, BV, LR, NK, Rina)

GPG

Hull Panel(13 members)

CSRMaintenance

Project Management TeamCSR Harmonization

(BV, DNV)

11 Project TeamsCSR-H

CSRSecretariat

EG/GBS

PT/GBS

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Harmonisation of CSR-OT & CSR-BC

CSR-H Deliverables

1. Common part

2. Part for specific shiptypes (oil tanker andbulk carrier)

Apr il

2006

CSR EIF

Harmonization

Detail Plan

Submission to

IMO

for GBS(Dec 2013)

PMT Project Management Team(BV, DNV)

1 - Wave Load (BV)

2 – Buckling (CCS)

3 - Finite Element Analysis (KR)

4 - Corrosion additions (ABS)

5 – Welding (RS)

7 - Ship in operation (Rina)

8 – Fatigue (DNV)

9 - Prescriptive Requirements (BV/DNV)

10 – Consequence Assessment (LR)

2007 2008 2009 2010 2011 2012 20132006

Total staff: 71

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Technical issues solved in ER April 2013

Number of LC for FE assessmentLC for FE•Governing Load Cases identified per ship type for

•Midship region

•Outside Midship

•Work in progress for foremost and

aftmost cargo hold

Fatigue• Improvement for prescriptive and FE fatigue assessment

Buckling• Improvement of Ch 8, Sec 5, Tab 2 case 2 (Simple support with σy)

• Improvement of plate buckling - side shell in single side bulk carriers

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Goal Based Standards

Residual strength after collision or grounding

• Introduced in Pt 1, Ch 5, Sec 3

Structural redundancy

•

Technical background is under development•Conclusion: Ship structure, i.e. stiffened panels with scantlings in

accordance with CSR have inherent redundancy and do not needreinforcement for this purpose

Fatigue Vibration due to whipping / springing• Implicitly covered for a very large part of ships as it is included in

the experience from operation

•Technical background Report is under development

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Goal based standards

Reference to IACSGuidelines

June 2013

No. Functional Req.

CSR-H

Text

Survey

Panel

PT/GBS-

GAPS

1 Design Life Yes - -

………

8 Watertight & Weathertight integrity Yes - -

9 Human element consideration (Yes) - Yes

10 Design transparency (Yes) - Yes

11 Construct ion quali ty procedures (Yes) Yes -

12 Survey during construct ion (Yes) Yes -

13 Survey and maintenance - Yes -

14 Structural accessibil ity Yes - -

15 Recycl ing - - Yes

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Main Rule Updates between July 2012 andApril 2013


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June 2013

Table of content – ER April 2013 - 1/2

Part 1: General Hull Requirements

Main Modifications :

Grab 20, 30, 35t

Removal of

IMO PSPC

Reduction offatigue loads

Reduction of

FE LC

Envelop

method

removal

SSS BC

modification

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Table of content – ER April 2013 - 2/2

June 2013

Part 1: General Hull Requirements Part 2: Ship Type Requirements

ImprovementProtection

against

wire rope

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Main Rule updates – Pt 1 – Ch 1 to 3

June 2013

Ch 1: Rule General

Principles

Ch 3: Structural

Design Principles

►Sec 1, [3.2.2]: Grab notation 35, 30, 20t►Sec 2: Many minor editorial corrections

►Sec 4: Corros ion protection: removal of IMO PSPC for ballast tanks►Sec 6: Structural detail principles

►[5.2] Connection of stiffener to PSM :Detail calculation when spacings are different

►[7.5] Bilge strake: Removed as duplicated in Ch 6 Sec 4►Sec 7:Structural idealisation

►[1.3.2] Effective breadth PSM: new formula but similar results►[1.4.2] Bulb section equivalency to Inverted Angle in net►[1.4.6] Z plastic: error correction with sin( w)

Ch 2: General

Arrangement Design

►Sec 4, [1]: Closed spaces must be accessible for easy inspection

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Main Rule updates – Pt 1 Ch 4 - 1/2Loads

June 2013

• Sec 2: Dynamic load cases

– Table 5: CWH increased by 10% except for OST/OSA cases instrength assessment

• Sec 3: Ship motions & accelerations

– Coeficient f fa = 0.9 for fatigue, introduced in f p factor (Mwv)

• Sec 4: Hull girder loads

– Cv and Ch removed and replaced by a 0.9 coefficient forfatigue analysis (Mwv , Mwh and Mwt)

– f nlh = 0.9 for strength & f nlh = 1 for fatigue :Mwh reduced for OST/OSA in strength assessment

• Sec 5:External loads

– Tab 14 : Editorial correction ( fxl =0.7 )

– f fa = 0.9 for fatigue introduced in f p factor (Pressure)

– [2.2.3] Green see loads: P D-min = 0 for FE analysis

– [3.2.1] Bottom slamming pressure case 2: (ztop-z) instead of ztop in formula and fSL coefficient

Ch 4: Loads

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Main Rule updates – Pt 1 Ch 4 - 2/2Loads

June 2013

• Sec 6 Internal loads

– fdc: new coefficient for dry cargo in fatigue f dc = 0.5 used in Pbd in[2.4.3]– MH and MHD defined for 50% consumables– Steel coils: correction of loads on hopper side by cos h :

• [4.2.2] & [4.3.2]: correction of F sc-hs and F sc-hs-s

• Sec 8 Loading conditions

– Identification of loading condition with “Max SFLC”– Cleaning of the large number of footnotes in tables (already

mentioned in the rule text)

– Midship tables: clerical error– Outside midship: introduction of governing LC in tables– Foremost and aftmost CH: reduction of LC but work still in

progress

– Introduction of missing check existing in the CSR-BC, URS25 andCSR-H text in line with the hold mass curves.

– Additional tables for fatigue analysis outside midship.

• App 1: Hold mass curves

– Re-analysis and presentation by ship type for seagoing andharbour in same table.

Ch 4: Loads

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Main Rule updates – Pt 1 – Ch 5 & 6Prescriptive Requirements

June 2013

• Sec 1 HG Yielding

– [3.4.6] Equivalent thickness of corrugated bhd provided for oil Tanker

• Sec 2 HG Ultimate strength

– Clarification of the Msw for the different design load scenarios

• App 2 HG Ultimate capacity

– Incremental method only - Single Step Ultimate Capacity method removed.

Ch 5:

Hull Girder Strength

• Sec 1 General

– Scope: clarification of scope in [1.1.1] including SS above FB deck, exposed deckof superstructure and internal decks except inside superstructure and deckhouse.

• Sec 2 Load application

– Tab 1, DL-1 draught = T BAL instead of T SC

• Sec 3 Minimum thickness

– Rearrangement of Tab 1 and add a row for other plates

• Sec 4 Plating

– Use of a and b instead of and s

– [2.2] Correction for bilge plate

• Sec 6 Primary supporting members and pillars

– PSM to be calculated in flooded conditions

Ch 6:

Hull Local Scantling

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M i R l d P 1 Ch 7


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Main Rule updates – Pt 1 – Ch 7Direct Strength Analysis

June 2013

• Sec 2 Cargo hold structural strength analysis

–Envelop method removed. Only individual method to be used.

– [2.2.2] Simplification for modelling the structure fwd theforemost CH

– [2.4.4] Corrugation: dummy rod elements to be modelled atintersection between flange and web

– [2.5.3] Boundary condition of aftmost CH: same as for midship– [2.5.4] End constraint beam characteristics: Area modified

– [4.2] Green sea loads on hatch cover to be considered– [4.3.3] Qtarg aft and fwd redefined– [4.4.5] HG Shear force adjustment procedure revisited.

Introduction of Method 1 and Method 2 using SFLC

– [4.4.9] Procedure to adjust vertical and horizontal bendingmoments outside midship

– [5.2.3] Tab 12 harmonised with tab for buckling, for the vertical

corrugated bhd with and w/o lower stool• Sec 3 Local structural strength analysis

– Fine mesh - Mandatory details

• Connections between deck and double bottomlongitudinal stiffeners and adjoining structures oftransverse bhd:

Clarification of the required fine mesh to be analysed

Ch 7: Direct Strength Analysis

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M i R l d P 1 Ch 8 1/3


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Main Rule updates – Pt 1 Ch 8 - 1/3Buckling

June 2013

• Sec 2: Slenderness requirements

– Geometry of the stiffener in Net thickness

– Plate panel: ReH can be based on mild steel provided the bucklngrequirements for prescriptive/ FE buckling comply with mild steel.

• Sec 3 Prescriptive requirements

– [3.2.1] Vertically stiffened side shell plating of Single Side Shell BCbetween hopper and top side tanks: Cases of Table 2 (Sec 5)corresponding to the shorter edge clamped to be considered togetherwith a mean σy stress and ψy = 1.

– [3.3.1] Side frame of single side shell of BC considered as stiffenerfor buckling assessment

• Sec 4 Buckling requirements for FE

– [2.3.3] d) Clerical correction in definition of “a”

– [2.4] Reference stress using stress based reference stress only (App 1)Displacement based reference stress removed.

– [4.1.1] Side shell of single side shell of BC: shorter edge of EPPconsidered clamped and ψ x = ψy = 1

– [4.1.2] Side frame of single side shell of BC considered as stiffenerfor the buckling assessment

Ch 8: Buckl ing

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M i R l d P 1 Ch 8 2/3


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Main Rule updates – Pt 1 Ch 8 - 2/3Buckling

June 2013

• Sec 5: Buckling capacity

– [2.2.5] F tran = 1.15 for single side shell of BC– [2.2.7] Applied stresses: stresses from beam/grillage analysis to be

corrected for Poisson effects ( ).

– Tab 2: Plane plate panels

• Case 2 (Simple support with y)

• New case 7 (long edge clamped with y)

• Corrections for case 8 (Short edge clamped with x)

• New case 9 (Short edge clamped with y)

• Corrections for case 10 (4 edges clamped with x)

• New case 12 (4 edges clamped with τ)

– Tab 3 Curved plate panels:

•

Editorial corrections• C value needs not to be taken less than expanded plane panel

– [2.3.4] Stiffener capacity: yw modified for angle and bulb profile.

– [2.3.5] Effective breadth modified.

– Tab 6 Clerical modification for Cwarp of the 4th Case

Ch 8: Buckl ing

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M i R l d t Pt 1 Ch 8 3/3


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Main Rule updates – Pt 1 Ch 8 - 3/3FE Buckling

June 2013

• App1 Stress based Reference Stress

– Regular panel• Longitudinal stress: a) quadratic distribution for plate buckling

b) weighted average for stiffener buckling

• Transverse stress: no modification (linear distribution)

– Irregular panel

• Weighted average approach with ψx = ψy = 1

Ch 8: Buckl ing

x

σ x

a

El. 1 El. 2 El. 3 El. 4 El. 5

Average =>

Stiff. buckling

Max => Plate buckling

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M i R l d t Pt 1 Ch 9


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Main Rule updates – Pt 1 Ch 9Fatigue

June 2013

• Re-arrangement of the sections.

• Sec 1 General considerations

– Material with ReH > 390 MPa or with fatigue performance: S-N Curves to beconsidered on a case-by-case basis.

• Sec 2 Structural details to be assessed

– Improvement of the figures for hot spots in Tables 4 through 18.

• Sec 3: Fatigue evaluation

– [3.2.1] Mean stress effect: σmCor , i( j) , σmax , ReEq– [3.3.1] Thickness effect: improvement for cruciform joint and clarification

between welded and non welded details for the n value

• Sec 4: Simplified stress analysis

– [4.1.1] Non linear factor introduced i.w.o. the water surface fNL and effectivebreadth modified.

– [4.2.6] Clarification for relative displacement in stress range.– Tab 4 stress concentration factors revised.– [5.3] Clarification for the methodology to apply in case of alternative design.

• Sec 5: FE Stress analysis– [3.1.2] and [4.2.3] Read out stress

• Average from each side of AA line and linear interpolation at xshift.

– [4.3.1] Hot spot in the web: σ HS = σshift – Tab 2 Stress magnification factor for Screening is revised.

• Sec 6: Design standards for details

– Distance to knuckle < 50mm

Ch 9: Fatigue

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Main Rule updates – Pt 1 Ch11 & Ch12

June 2013

• Sec 1: Superstructures, deckhouses and companionways

– [1.1.1] Scope clarified.– [3.1] Superstructure sides and decks

– [3.2.1] Plating instead of deck plating of exposed decks

– [3.2.3] Beams and stiffeners instead of deck beams & longdeck stiff.

Ch 11:Superstructure,

Deckhouses and Hull

Outfitting

Ch 12: Construction

and Welding

• Sec 1: Construction and fabrication

– [3.3.1] bent plates: scope changed. 2 bullets apply only forcorrugated bhd subject to lateral liquid pressure.

• Sec 3: Design of weld joints

– [2.2.2] clarification of a few items

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Main Rule updates – Pt 2 – Ch 1 & 2

June 2013

• Sec 2: Structural design principles

– [3.3.4] Hatchways: added requirements for protection againstwire rope.

• Sec 3: Hull local scantling

– [1.1.1] Side frame area: 1.1 coefficient was missing.

– [2.3.1], [2.3.2], [2.4.1] and [2.4.2] Steel coils, correction due to unitmodification of “ F ” in Ch 4

• Sec 5: Hatch covers

– Tab 3: consistency with Ch. 8

– [4.1.7]: Self weight to be considered for hatch cover analysis.

•

Sec 3: Hull local scantling– [1.5.4] Deck transverse adjacent to transverse bhd: missing with

regard to CSR-OT.

Ch 1: Bulk Carriers

Ch 2: Oil Tankers

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What Next?

Consequence assessment

Schedule


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Consequence assessment ships

ID Type Lpp B Tsc D Dwt

BC-1 Capesize 1 285 46 18 25 180200

BC-2 Capesize 2 284 45 18 25 180000

BC-3 Capesize 3 293 50 18 25 205000BC-4 Baby Cape 1 240 43 15 21 114500

BC-5 Baby Cape 2 248 43 15 20 115000

BC-6 Panamax 1 225 32 14 20 82000

BC-7 Panamax 2 223 32 15 20 81000

BC-8 Handymax 1 183 32 13 18 53000

BC-9 Handymax 2 185 32 13 18 57000

BC-10 Handymax 3 185 32 14 18 48000

June 2013

ID Type Lpp B Tsc D Dwt

OT-1 VLCC 1 319 60 23 30 318000

OT-2 VLCC 2 324 60 21 29 330000

OT-3 Suezmax1 264 48 17 24 158000OT-4 Suezmax2 264 50 17 23 163000

OT-5 Aframax 1 240 42 15 22 97000

OT-6 Aframax 2 240 44 15 21 103000

OT-7 Aframax 3 234 42 15 21 105000

OT-8 Panamax1 220 32 15 21 76000

OT-9 Panamax2 219 32 15 21 74000

OT-10 Handymax1 176 32 13 18 51000

Bulk carriers Oil tankers

CA Report based on ER April 2013 version available (1200 pages)

CA updates at each Rule Release

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June 2013

Harmonised CSR - Time Schedule

2011 2012 2013 2014

Submission

1st External draft

1st Hearing

Industry

2nd HearingIndustry

Technical Committee

Review

IACS Council

Adoption

Final CSRH

Final draft

2nd External draft

2012-07-01

2013-12-31

External review period

Technical Committee review

IACS adoption

Entry into force (T.B.D.)

?

2013-04-01

2013-11-01

2013-12-18

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Overall situation:


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Overall situation:IMO & Harmonised CSR

June 2013

Jul

2012

Jan

2013

Jul

2013Jan

2014

Jul

2014

Industry Review FeedbackReworkIndustry

Review

FeedbackRework TC

Ext. Release CSR-H

IACSCouncil

AdoptionText of CSR-H and TB available onIACS web site:http://www.iacs.org.uk/

2nd Presentation to Industry,

June 2013: Athens, London: 18 & 20 Asia: 24, 26 & 28 Submission

1st Presentation

to Industry,Sept. 2012

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Documents

Ind Presentation CSRH Intro Rule Updates