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IACS Common Structural Rules

INTERTANKO LATIN AMERICAN PANEL. IACS Common Structural Rules. Rio de Janeiro, 25 April 2006. Aim. To develop a set of unified Rules and Procedures for the determination of the structural requirements for oil tankers and bulk carriers. Objective.

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IACS Common Structural Rules

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

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

  3. 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

  4. 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

  5. Addressing “robustness” • 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.

  6. IACS Common Structural Rules CSR for Tankers • LRS, ABS & DNV • Complete Set of Structural Rules for Double Hull Oil Tankers • Length greater than or equal to 150m 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

  7. 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

  8. In Service Design Wastage Allowance Corrosion Addition Predicted corrosion in 2.5 years (0.5 mm) Required Net Thickness Required Renewal Thickness Annual Thickness Measurements CSR Features - Net Scantling Approach includes link between newbuilding and in-service standards

  9. CSR Features – Renewal Criteria • 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

  10. CSR Features – Coating Performance Standard • 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)

  11. IMO Coating Performance Standards (CPS)Earliest Implementation Schedule for SOLAS and IACS CSR 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 2006(Jan) 2007(Jan) 2008(Jan) Draft CPS (DE 49) Adoption of CPS and Revised SOLAS II-1/3-2 (MSC 82) RevisedSOLAS II-1/3-2 entry into force mandating CPSfor shipswith keel laidon/after 01 Jul 08 Approval of CPS and SOLAS II-1/3-2 (MSC 81) SOLAS XII/6.3 enters into force recommending CPS for Bulk Carriers IACS CSR requires CPS for shipscontracted for construction on/after the adoption date of the Revised SOLAS II-1/3-2

  12. IACS PR 29 – Contract date and sister vessels

  13. IACS PR 29 – Contract date and sister vessels

  14. Where to get more information ABS Support for CSR: www.eagle.org CSR Tanker: www.jtprules.com CSR Bulk Carrier: www.jbprules.com

  15. CSR Maintenance and Harmonization • 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

  16. CSR Tankers

  17. CSR/Tanker - Table of Contents Hull Girder Ultimate Strength Structural Strength Assessment Fatigue Strength Assessment Buckling Strength Assessment

  18. Ship Details

  19. Summary Approx. steelweight changes (1) plating has not been optimised

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