IMO  (International Maritime Organization)

   

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Intersessional Correspondence Group

on Intact Stability

at SLF Sub-Committee

 

Coordinator: Naoya Umeda (JAPAN)

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Terms of Reference

The Sub-Committee agreed to re-establish the Correspondence Group on Intact Stability, under the coordination of Japan, and instructed it to:

 

.1      continue to work on the items contained in the updated plan of action for the second generation intact stability criteria, as set out in annex 3 to document SLF 54/WP.3, taking into account documents SLF 54/3,  SLF 54/INF.12 and SLF 54/INF.13 and the second part of the report of the working group established at SLF 53 (SLF 54/3/1), also taking into account documents SLF 54/3/2, SLF 54/3/3, SLF 54/3/4, SLF 54/3/5, SLF 54/3/6, SLF 54/3/7, SLF 54/3/8, SLF 54/INF.4, SLF 54/INF.6, SLF 54/INF.7, SLF 54/INF.9, SLF 54/INF.10 and SLF 53/INF.3, as well as relevant documents from previous sessions;

.2      verify and further refine draft vulnerability criteria (Levels 1 and 2) for each mode as listed in annex 3 to document SLF 54/WP.3 and, in doing so,  expand the types and the number of ships for verification and validation;

.3      review the framework for new generation intact stability criteria development and terminology and revise it, as appropriate;

.4      develop, verify and further refine direct stability assessment procedures for the stability failure modes identified in annex 3 to document SLF 54/WP.3;

.5      consider developing guidance for ships carrying timber deck cargoes regarding the increased weight of ice in relation to the 2008 IS Code (part B, section 6.2), taking into account the relevant parts of documents SLF 54/2/1 and SLF 54/16/1, and also bearing in mind that the sinking of a ship may be due to a loss of positive stability caused by excessive ice accretion;

.6      further consider the safety issues relating to the very serious casualty on board the containership Chicago Express, based on document SLF 54/16

.7      consider the possible effect of excess water, accumulated as a result of fire-fighting, on intact stability and on freeing port area requirements, taking into account document SLF 54/2/2 and the Guidelines for the drainage of fire-fighting water from closed vehicle and ro-ro spaces and special category spaces of passenger and cargo ships (MSC.1/Circ.1320) and

.8      submit a report to SLF 55.

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Member States & NGOs

BAHAMAS, BRZAIL, CANADA, CHINA, DENMARK, FINLAND, FRANCE, GERMANY, GREECE, ITALY,  JAPAN, MALAYSIA, MARSHALL ISLANDS, NIGERIA,POLAND, PORTUGAL, LIBERIA,REPUBLIC OF KOREA, RUSSIAN FEDERATION, SLOVENIA, SPAIN,SWEDEN, TURKEY, UNITED KINGDOM, UNITED STATES, VANUATU, HONG KONG CHINA, IACS, ISO,  ITTC, RINA,SYBAss  (March, 2012)

 

Sample ship data

CG report to SLF 52

CG INF document to SLF 52

Full contents of Italian submission to CG

Presentation of Germany at SLF52

Presentation of Italy at SLF52

CG report to SLF 53

CG INF document to SLF 53

Detailed technical background of document SLF53/3/9 by Italy

  -Simplified_dGM__20101207.pdf

  -Threshold_curve_with_transient_effects__20101207.pdf

CG INF document to SLF 54

Correspondence Group established at SLF 54

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 Reference wave proposals

   ISCG 54/1        Selection of reference environmental conditions for vulnerability criteria for parametric roll and pure loss of stability, submitted by Italy, 28 February 2012.

   ISCG 54/2        Environmental Conditions for Use with Draft Level 1 Vulnerability Criteria for Pure Loss of Stability and Parametric Roll, submitted by USA, 9 March 2012.

   ISCG 54/3        Comments on the Proposal from Italy on the gSelection of reference environmental conditions for vulnerability criteria for parametric roll and pure loss of stabilityh as well as the proposal from the USA, submitted by Japan, 26 March 2012.

   ISCG 54/17      Summary of three reference wave proposals, by the coordinator, 29 May 2012.

   ISCG 54/18      ISCG questionnaire for selecting reference wave cases, by the coordinator, 29 May 2012, corrected on 20 June 2012.

   ISCG 54/27      Summary of results of ISCG questionnaire for selecting reference wave cases, by the coordinator, 6 July 2012.

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 Sample calculation results for reference wave proposals

   ISCG 54/4        Sample Calculation of three reference wave proposals for parametric roll criteria using the C11 class post-Panamax containership, submitted by Japan, 12 April 2012.

   ISCG 54/5        SLF_54 Level 1 vulnerability analysis of large motoryachts Pure loss of stability, parametric roll and excessive stability, submitted by SYBAss, 4 May 2012.

   ISCG 54/6        Application and comments of vulnerability criteria on a large ship sample, submitted by France, 4 May 2012.

   ISCG 54/7        Environmental Conditions for the 1st Level Vulnerability Criteria: Sample Calculations and Comments, submitted by USA, 4 May 2012.

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 Clarification questions on sample calculation results for reference wave proposals

   ISCG 54/8        Clarification questions on the sample calculation results from SYBAss, France and USA for the reference wave cases, submitted by Japan, 18 May 2012.

   ISCG 54/21      Reply to clarification questions, by SYBAss, 1 June 2012.

   ISCG 54/23      Reply to clarification questions, by USA, 18 June 2012.

   ISCG 54/25      Comments on replies to Japanfs clarification questions on the sample calculation results for the reference wave cases, by Japan, 26 June 2012.

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 Additional proposal of reference wave cases and comments on it.

   ISCG54/9         Comments on proposal from delegation of Japan, submitted by China, 12 April 2012.

   ISCG 54/10      Reply to the comments from China on the reference wave case proposal from Japan, submitted by Japan, 1 May 2012.

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 Updating draft criteria for parametric roll and pure loss of stability and comments on it

   ISCG 54/11      Updated draft vulnerability criteria of levels 1 and 2 for failure modes of pure loss of stability and parametric rolling, submitted by the coordinator, 1 May 2012. (editorial updating only)

   ISCG 54/12      Proposal on undecided standard values of vulnerability criteria for pure loss of stability in waves, submitted by Japan, 27 April 2012.

   ISCG 54/13      Comments on the proposal from Japan on gProposal on undecided standard values of vulnerability criteria for pure loss of stability in wavesh, submitted by France, 18 May 2012.

   ISCG 54/14      Proposal of revision of updated draft vulnerability criteria of levels 1 and 2 for failure modes of pure loss of stability and parametric rolling, submitted by Japan, 18 May 2012.

   ISCG 54/15      Sample Calculation Results of the Pure Loss of Stability Level 1 & 2 Criteria for the ONR-tumblehome vessel, submitted by Japan, 18 May 2012.

   ISCG 54/16      E-mail comments from China, submitted by China, 18 May 2012.

   ISCG 54/19      Proposal of revision of updated draft vulnerability criteria of levels 1 and 2 for failure modes of pure loss of stability and parametric rolling, submitted by Japan, further revision, 29 May 2012.

   ISCG 54/20      Comments on the documents ISCG 54/10, 12 and 14, by USA, 31 May 2012.

   ISCG 54/22      Comments on Updated draft vulnerability criteria for PR and the reference wave proposals, by ROK, 12 June 2012.

   ISCG 54/24      Comments on recent developments in the Correspondence Group and on "Proposal of Revision of UPDATED DRAFT VULNERABILITY CRITERIA OF LEVELS 1 AND 2 FOR THE FAILURE MODES OF PURE LOSS OF STABILITY AND PARAMETRIC ROLL - by Japan, by Italy, 13 June 2012.

   ISCG 54/26      Comments on responses to Japanfs proposal of revising the draft vulnerability criteria for parametric rolling and pure loss of stability, by Japan, 26 June 2012.

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    Grim program

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   ISCG 54/36      Sample calculation results of draft vulnerability criteria for parametric rolling and pure loss of stability, by Japan, 31 August 2012

   ISCG 54/41      Sample Calculations and Comments on the Level 1 and 2 Criteria for Parametric Roll and Pure Loss of Stability, by Sweden, 15 October 2012

@   ISCG 54/43     Sample Calculations for Vulnerability Criteria on Pure Loss of Stability, Level 2, by USA, 18 October 2012

   ISCG 54/44     U.S. Comments on ISCG 54/36 "Sample calculation results of draft vulnerability criteria for parametric rolling and pure loss of stability" by Japan, by USA, 22 October 2012

   ISCG 54/48     SAMPLE CALCULATION RESULTS OF DRAFT VULNERABILITY CRITERIA FOR PARAMETRIC ROLLING, PURE LOSS OF STABILITY AND EXCESSIVE ACCELERATION , submitted by IACS

  

Updating draft criteria for broaching and comments on it

   ISCG 54/42     Sample calculation results of draft vulnerability criteria for broaching, by Japan, 15 October 2012

   ISCG 54/47     Sample Calculations for Vulnerability Criteria on Surf-Riding, Level 2, by USA, 23 October 2012

   Excessive acceleration

   ISCG 54/28      Updated draft of Level 1/2 criteria of excessive acceleration, by China, 18 July 2012.

   ISCG 54/31      Procedures for determining the coefficients C1 and C2, by China, 9 August 2012.

   ISCG 54/32      Verification of the draft for Excessive Acceleration proposed by China, by Japan, 14 August 2012.

   ISCG 54/33     Comments on the verification from Japan, by China, 15 August 2012

   ISCG 54/34     Comments from the German delegation to the Proposal from China regarding Level 1 and Level 2 Criteria for Excessive Accelerations, by Germany, 20 August 2012

   ISCG 54/39      Sample calculation results of Excessive Acceleration, by Japan, 3 October 2012

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Direct Stability Assessment

   ISCG 54/45    US Replies to document SLF 54/INF.12, Annex 22 "Comments on US submission for direct stability assessment procedures" by Japan, by USA, 22 October 2012

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Framework & Terminology

   ISCG 54/37      FRAMEWORK FOR THE SECOND GENERATION INTACT STABILITY CRITERIA, by the Coordinator, 20 September 2012

   ISCG 54/38      DRAFT TERMINOLOGY FOR THE NEW GENERATION INTACT STABILITY CRITERIA, by the Coordinator, 20 September 2012

   ISCG 54/46      U.S. Comments on draft revised Framework and Terminology, by USA, 22 October 2012

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Ice Accretion

   ISCG 54/29      Invitation to proposals of guidance for ships carrying timber deck cargoes regarding the increased weight of ice, by the Coordinator, 31 July 2012.

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Safety issues on the containership Chicago Express accident

   ISCG 54/30      Invitation to comments on the safety issues on the containership Chicago Express accident, by the Coordinator, 31 July 2012

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Fire-fighting Water Effect

   ISCG 54/35      Questionnaire for effect of accumulation of fire-fighting water on intact stability and freeing port area requirements, by the Coordinator, 27 August 2012

   ISCG 54/40      Results of ISCG questionnaire for effect of accumulation of fire-fighting water on intact stability and freeing port area requirements, by the Coordinator, 5 October 2012

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     CG INF document to SLF55

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