Now available: July 2025 edition of DNV class rules and documents for ship and offshore

The July 2025 edition of DNV’s rules and standards for the classification of ships and offshore units will enter into force on 1 January 2026. Following a constructive hearing process, 119 documents have been published. This news highlights key changes introduced in the new edition.

Relevant for design offices, shipyards, suppliers, owners/managers and flag states.

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DNV ship rules and standards

  • Revised assessment methods for propellers and clarified requirements for thrusters (Pt.4/Ch.4, Pt.6/Ch.6)
  • Complete revision of rules for water jets (Pt.4/Ch.5/Sec.2)
  • New qualifier Offshore service vessel, T-LOG facilitating enhanced reporting from anchor-handling operations (Pt.5/Ch.9)
  • Update of requirements to alternative fuels, new qualifier Hydrogen for Fuel ready notation and WAPS ready for vessels built to accommodate a future installation of WAPS (Pt.6/Ch.2)
  • New notation CO₂ RECOND for vessels preparing CO₂ for offloading (Pt.6/Ch.4/Sec.17)
  • Updated Walk2work notation and introduction of the in-operation Walk2work notation (Pt.6/Ch.5/Sec.16, Pt.8/ Ch.4/Sec.8)
  • Introduction of in-operation class notation Clean containing. requirements for ship owners/managers (Pt.8/Ch.4/Sec.3)
  • Class notation Connect changes name to DDV (data-driven verification) (Pt.8/Ch.3)

DNV offshore rules (DNV-RU-OU)

  • Revised and updated Abate class notation, including new qualifiers PE for power from external sources and CCW for carbon capture from well stream (for production units) (RUOU-0101, RU-OU-0102, RU-OU-0103, RU-OU-0104)
  • New Sustainability class notation for showing compliance with the UN Sustainable Development Goals (RU-OU-0101, RU-OU-0102, RU-OU-0103, RU-OU-0104)
  • New qualifier CO₂ for DRILL class notation, for requirements for drilling CO₂ injection wells (RU-OU-0101, RU-OU-0104)
  • Class notation Connect changes name to DDV (data-driven verification) (RU-OU-0300)
  • New MIM class notation for mooring integrity manage-ment (RU-OU-0300)

DNV offshore standards and statutory interpretations (DNV-OS and DNV-SI)

  • Revised and updated material requirements, and fabrication and testing of offshore structures to align with rules for ships (OS-B101, OS-C401)
  • Restructured and updated structural standards for column-stabilized units, tension-leg platforms and deepdraught floating units to align with other offshore structural standards (OS-C103, OS-C105, OS-C106)
  • Revised and updated requirements for electrical systems to align with ship rules, IACS and other international standards (OS-D201)
  • Revised and updated requirements for (N) notation for Norwegian continental shelf to align with updated acknowledgement of compliance (AOC) handbook and change of name of regulator from PSA to Havtil (SI-0166)

The rules may be applied to projects contracted before the entry into force date, provided all parties agree. DNV publishes one main rule edition annually, with the next edition scheduled for release in July 2026. Occasionally, additional amendments may be introduced between the main editions. These amendments are announced in the Rules & Standards Explorer.

Recommendations

DNV recommends that stakeholders become familiarized with the changes before they enter into force.

References

Contact

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