Tripartite meeting Seoul, September2009

1
Tripartite meetingSeoul, September 2009

• Status and Early Experience of CSRs
• Kirsi Tikka
• Vice President, Global Technology and
• Business Development, ABS
• IACS Small Group/CSR Chair

2
Update on CSR

• History of the Common Structural Rules
• Adoption January 2006
• Implementation April 2006
• One year feedback period before developing
  harmonization plan
• Currently ongoing
• CSR Maintenance
• CSR Harmonization

3
IACS Organisation for CSR
4
Tripartite meeting Seoul, September 2009

• Update on CSR Maintenance

5
Adopted CSR Rule Changes and Corrigenda

• Tanker
• Rule Change Notice 1 (Sept 2006)
• Corrigenda 1 (Apr 06)
• Corrigenda 2 (July 06)
• Corrigenda 3 (Nov 2007)
• Rule Change Notice 2 (Feb 2008)
• Corrigenda 1 to the July 2008 edition (June
  2008)
• Rule Change Notice 1 to the July 2008 edition
  (Jan 2009)

Tanker consolidated version 1 July 2008
Tanker consolidated version 1 July 2009
Note Based on further input from industry,
IACS Council has decided to postpone the
implementation of Rule Change Notice 1 to the
July 2008 edition until such time as a technical
study is completed.
6
Adopted CSR Rule Changes and Corrigenda

• Bulk Carrier
• Corrigenda 1 (May 06)
• Corrigenda 2 (Jan 07)
• Corrigenda 3 (July 07)
• Corrigenda 4 (Sept 07)
• Rule Change Notice 1 (Nov 2007)
• Rule Change Notice 2 (Feb 2008)
• Corrigenda 5 (May 2008)
• Rule Change Notice 3 (12 Sept 2008)
• Rule Change Notice 1 to the July 2008 edition
  (Jan 2009)

Bulk Carrier consolidated version 1 July 2008
Bulk Carrier consolidated version 1 July 2009
7
Current CSR Rule Changes

• Tanker
• RCN 1
• Accepted by HP
• 1st round of TC and Industry Group review (July
  Aug 2008)
• Comments incorporated or addressed by CSR PT2
• 2nd round of TC and Industry Group review (Oct
  Nov 2008)
• Published January 2009
• Effective date (postponed)

8
Current CSR Rule Changes

• Bulk Carrier
• RCN 1
• Accepted by HP
• 1st round of TC and Industry Group review (July
  Aug 2008)
• Comments incorporated or addressed by CSR PT1
• 2nd round of TC and Industry Group review (Oct
  Nov 2008)
• Published January 2009
• Effective date 1 July 2009

9
Revision History Tracking Database

• IACS CSR Tracking Database is available on-line
•  Objective
• - Provide users with a searchable database on
  CSR revision history with supporting materials
• - Provide users easy and quick access to a
  full and up-to-date history of a particular
  requirement
• Test and development
• - It was tested during 2008, and launched to
  general public as a development version in Nov
  2008
• - There are now over 60 industry users
• Web link www.iacs-csrtrack.org.uk

10
Revision History Tracking Database

• What is published
• - Full History of Revision (Rule Changes and
  Corrigenda) on a paragraph by paragraph
  basis
• - Date of approval, what was
  amended/corrected, Technical Background,
  implementation date
•  Search Facility
• Search and sort out rule change text by Rule
  Change Notice/Corrigenda No., approval date, or
  effective date etc.
• Industry and interested users are invited to
  contact the IACS CSR Secretariat
  (csr_at_iacs.org.uk) for log-in IDs and a User
  Manual.

11
IACS CSR Knowledge Centre (KC) activity(as of 31
July 2009)

• KC since 1 August 2006 to capture Questions
  Answers, Common Interpretations, and Rule Change
  requests
• 805 entries in the database - 261 relating to the
  Tanker Rules, 534 to the Bulker Rules and 10 to
  both sets of Rules
• 724 of the items have been completed (246 tanker,
  469 bulker and 9 both)
• 305 items led to a rule change being requested
  (around 50 editorial changes)

12
Typical CSR Experience / KC activity driving rule
changes

• General findings
• Steel weight is generally increased.
• Stiffeners
• Web frames
• Midship area
• Structural enhancements
• Steel placed where needed
• Additional criteria applied (S, SD, Impact,
  Buckling, Fatigue, Ultimate strength, Empirical)
• Interaction between structural elements
  (Plates/Stiffeners)
• Enhanced design loads (NA, 25 years,
  hydrodynamics based)
• Optimization
• Designers are becoming more proficient with CSR
• Optimizing to rule minimums
• Constantly carrying out scantling comparisons
  with previously approved designs
• Requesting re-review of local requirements that
  are outside the norm
• Greater of higher strength steel being proposed
• Provided for local plate increases
• Provided for local high stress areas found during
  analysis
• Buckling and fatigue closely reviewed in way of
  HTS

13
Typical CSR Experience / KC activity driving rule
changes

• General findings (continued)
• Areas for CSR improvement
• Tighten up rule minimums
• Tighten up rule interpretations
• Clarify rules through feedback / Knowledge Center
• Constantly strive to relate requirements to
  actual physical phenomena (loads and structural
  response)
• Reference service history back-up for enhancement
  to requirements

14
Cross Check Project Status
Prescriptive Rules Cross Check and FEA Cross Check All 10 IACS members involved First phase of the Cross Check for Tanker and Bulk Carrier calculations has been completed The results provide a benchmark for the societies to verify their calculation tools The results indicate reasonable coherence Common interpretations and/or Rule changes will be needed to clarify the application of the Rules Additional work will be carried out to cover more ships
15
Tripartite meeting

• Update on CSR Harmonization
• as of Aug 2009

16
Harmonized Structural Rules for Oil Tankers and
Bulk Carriers

• Deliverables
• Common Rules covering Oil tankers and bulk
  carriers
• 3 booklets
• Common parts for both types
• Specific part applicable to Oil Tankers
• Specific part applicable to Bulk Carriers
• Preliminary draft issue of complete harmonized
  rule for stakeholder comment by Dec 2011
• Final draft issue scheduled for mid 2012

17
General Action Plan for CSR Harmonisation

• Items identified at CSR release for long term
  harmonisation
• Wave loads
• Fatigue
• Finite element analysis
• Buckling
• Prescriptive requirements
• Comments from ICS
• Quartering Sea
• Corrosion
• Welding
• FEM analysis

18
Project Teams Established in 2008
HPT 1 Wave Loads Harmonization of the LoadsIncludes re-examination of the environmental data and quartering sea condition for bulk carriers
HPT 2 Buckling Harmonization of Buckling calculation methods for prescriptive and FEM
HPT 3 FEA Harmonization of FEM calculation methods
HPT 4 Corrosion Re-examination of data
HPT 5 Welding Review of welding requirement especially in way of high stress areas
HPT 6 Fatigue assessment of hatch corners of Bulk Carriers under Quartering Sea for updating CSR BC
19
Project Teams Established in 2009
HPT 7 Ship in Operation Criteria
HPT 8 Fatigue assessment
HPT 9 Prescriptive criteria
Sub group HPT 9.1 Safety criteria and principles
Sub group HPT 9.2 Detailed requirements
20
Project Status
HPT 1 Wave Loads Extreme loads (10-8)HS, FS and BS load cases achieved for Accelerations, Hull girder loads, internal external pressure Oblique sea in progress in connection btwn HPT1 HPT6 Fatigue loads started Sub-PT for Re-Examination of the environmental data 95 progress
HPT 2 Buckling Draft text for slenderness requirement, prescriptive formulae, hull girder buckling stress, Stiffeners used as PMA FEM buckling appraisal in progress
21
Project Status
HPT 3 FEA The main tasks in progress Eccentric beam for modeling Requirement of large opening Boundary Condition Equilibrium Method List of Compulsory Details to be analyzed by Fine Mesh Analysis Screening Criteria for Fine Mesh Analysis Fine Mesh Model Size and Permissible Criteria
22
Project Status
HPT 4 Corrosion The following have been completed Detailed Background Document for the Harmonized Rules Harmonized text for Net Scantling Approach and Corrosion Additions Technical Background Document In progress After analysis of the data received from IACS members and ICS, the corrosion additions will be reviewed and possibly updated. The harmonized rule text, detailed background and technical background will be updated as appropriate over the next two years to accommodate further input from GBS, analysis of new data and general feedback that is received.
23
Project Status
HPT 5 Welding The updated fillet welds scantling comparison Draft of HSR fillet weld factors for different structural members Preliminary calculation of the impact on existing rules performed Preliminary list of high stress areas prepared to meet ICS requirements In progress Draft rules and TB
24
Project Status
HPT 6 Fatigue of Hatch Corner under quartering sea in CSR BC Two different load-cases with respect to torsion Development of new load-cases and application to FE cargo hold models In progress Load generation Dominant wave states were identified Envelope curves for the torsional moments Development of EDW and pressure distribution for the mid-ship area Boundary condition for FE cargo hold models Load application on FE cargo hold models Numerical analysis Spectral fatigue analyses carried out for a handymax and cape-size vessel
25
Project Status
HPT 7 Ship in Operation Task 50 finalized under supervision of Survey Panel will be used by HPT7 Work programme approved by Council on 2.6.09 Kick-off meeting in Sept 09
HPT 8 Fatigue Work programme approved by Council on 2.6.09 Kick-off meeting held on 26-28 Aug 09 CSR Rule comparison started Preliminary discussion on fatigue load in progress
HPT9 Prescriptive criteria Work programme approved by Council on 2.6.09 Kick-off meeting held on 16-18.6.09 for the 2 sub groups CSR Rule comparison started
26
Thank you
Status and Early Experience of CSRs Kirsi
Tikka Vice President, Global Technology and
Business Development, ABS IACS Small Group/CSR
Chair