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Common Structural Rules

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DNV GL Common Structural Rules

The new IACS Common Structural Rules for Bulk Carriers and Oil Tankers (CSR BC & OT) will be replacing the existing Common Structural Rules for Double Hull Oil Tankers (CSR-OT) and Common Structural Rules for Bulk Carriers (CSR-BC).

What is CSR BC & OT?

It is a comprehensive and consistent rule set which will set the standard for oil tankers and bulk carriers. The new rule set consists of two main parts: The first is a common part covering general hull requirements applicable to both ship types, such as wave loads, hull girder strength, buckling and fatigue requirements. The second part covers ship-type specific requirements only applicable to bulk carriers or oil tankers. The rule application has not changed from CSR-OT and CSR-BC. The rules will also comply with SOLAS II-1 Regulation 3-10 “Goal-based ship construction standards for bulk carriers and oil tankers” (GBS).


For which vessel types and sizes is the CSR BC & OT applicable?

CSR BC & OT applies to:

  • Tankers for oil and oil product, with length 150m or above
  • Bulk carriers with length of 90m or above

Excluded by the CSR are: Ore carriers, open hatch bulk carriers without hopper and top side tanks, OBOs, self-unloaders and some other specialized bulk carriers


Key features of the CSR BC & OT compared to CSR-OT and CSR-BC

  • Extended verification scope, including FE analysis of all cargo holds
  • More transparent and consistent requirements, including technical background
  • Improved load model/formulations based on direct wave load analysis
  • Enhanced fatigue standard, including detail design standard
  • Hull girder buckling, also including lateral pressure and the combination with shear stress
  • Hull girder ultimate limit state assessment, including damaged condition
  • Compliance with IMO Goal Based Standards (GBS)
  • Increased design grab weight for Panamax and Capesize vessels (Applicable only for Bulk Carriers)
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