Major Standards Updates for Shipbuilding and Marine Structures — September 2026

September 2026 delivered significant advancements in maritime safety, efficiency, and environmental performance, with the introduction of three new international standards for the shipbuilding and marine structures sector. Covering hull construction, propulsion energy measurement, and model testing for ships and offshore platforms in icy conditions, these standards provide robust frameworks for ensuring safety, operational performance, and compliance with evolving global regulations. Professionals in ship design, engineering, quality management, and marine research will find these updates particularly impactful.

Overview / Introduction

The shipbuilding and marine structures industry plays a pivotal role in global commerce, energy, and transportation, operating in some of the world's most challenging environments. Continual advancements in standards are essential to address new technologies, operational demands, and the risks associated with marine activities—from coastal recreation to Arctic exploration.

International standards are the backbone of safety, quality, and innovation in this sector. They harmonize construction practices, specify performance metrics, and provide clear guidelines for compliance, benefiting designers, builders, operators, and regulators alike. In this comprehensive article, you'll discover:

• The scope and significance of the September 2026 standards di- Key technical requirements and changes introduced
• How the new standards affect ship design, propulsion systems, and Arctic/offshore operations
• Compliance strategies and implementation tips

Detailed Standards Coverage

ISO 12215-9:2026 - Structural Integrity for Sailing Craft Appendages

Small craft — Hull construction and scantlings — Part 9: Sailing craft appendages

The newly revised ISO 12215-9:2026 establishes comprehensive requirements for the structural design of sailing craft appendages—such as keels, centreboards, and their attachments—on monohull vessels up to 24 meters. Following a decade of progress since its previous edition, this standard addresses one of the most critical safety aspects in small craft: the prevention of keel or appendage failures and the associated capsizing risks.

What It Covers:

• Definitive loads and scantling rules for sailing craft appendages
• Detailed design stresses for various materials (metals, FRP, wood), with new coefficients and safety factors
• Updated procedures for both computational (3D) and traditional stress analysis techniques
• Multiple load case scenarios (e.g., fixed keel knockdown, canted keel hell, pounding and impact, capsize recovery)
• Guidance on keel-to-hull connections, bottom shell plating, bolts, backing plates, and fatigue assessment

Key Requirements and Specifications:

• Design Stresses: The standard clarifies the limits for direct, shear, flexural, and bearing stresses of appendage materials, with precise adjustment for material properties, load cases, and craft design category.
• Structural Components: Assessment includes all vital connections (e.g., bolts, backing plates), bottom plating near the keel, and critical hull-appendage interfaces.
• Load Cases: Six major load cases must be assessed—including 90° knockdown for fixed keels, vertical pounding, longitudinal impact, and capsize recovery—for comprehensive structural resilience.
• Compliance Methods: Accepts either advanced 3D numerical modeling (e.g., finite element analysis) or simplified 2D formulae. Both routes require thorough documentation and annex completion.
• Fatigue and Inspection: Explicit fatigue strength assessment, especially for welded fabricated keels, with increased operational life factor (now 16 million stress cycles).

Who Needs to Comply:

• Shipyards and builders of monohull sailing craft up to 24 meters
• Naval architects and marine structural engineers
• Certification bodies and regulators overseeing recreational and commercial sailing vessels

Practical Implications:

• Adhering to ISO 12215-9:2026 leads to safer and more robust sailboat designs, with lower risk of appendage failure in extreme conditions—especially important for new builds, refits, and post-grounding inspections.
• Noteworthy changes include mandatory compliance documentation (Annex A), advanced treatment of canting keel supports, and stricter bolt arrangement/performance criteria.

Key highlights:

• Expanded coverage of canting keels and actuator structures
• Doubling of fatigue life expectations for welded components
• Mandatory compliance declarations and new guidance on bolt/weld arrangements

Access the full standard:View ISO 12215-9:2026 on iTeh Standards

ISO/TS 25128:2026 - Standardized Test Method for Propulsion Energy Consumption

Small craft — Propulsion system energy consumption — Test method

ISO/TS 25128:2026 introduces the first standardized framework for measuring, documenting, and presenting mechanical propulsion energy usage in small craft underway. This technical specification responds to growing demand for robust energy performance data across recreational boating, commercial marine operations, and sustainability-focused initiatives.

What It Covers:

• Requirements for laboratory and on-water measurement of mechanical energy consumption, regardless of propulsion system (combustion, electric, hybrid, etc.)
• Standardized test setup—including payload, fuel, engines/motors, and propellers
• Methods for measuring consumption at the point of energy conversion (motor/engine)
• Clear process for determining energy efficiency and range
• Guidance on external environmental factors (sea state, wind, temperature)

Key Requirements and Specifications:

• General Test Conditions: Ensures test repeatability by specifying payload, engine setup, and consistent environmental parameters
• Test Procedure: Divided into stages of stabilization, data capture, and performance analysis
• Measurement and Calculation: Covers direct energy draw from the system and conversion ratios, enabling apples-to-apples comparisons across craft and propulsion types
• Result Documentation: Requires transparent recording and reporting of all variables, facilitating craft benchmarking and regulatory compliance
• Scope Limit: Excludes wind, wave, and wind-assisted propulsion systems; focuses solely on mechanical or motorized craft

Who Needs to Comply:

• Small craft designers, manufacturers, and operators
• Marine testing laboratories and certification authorities
• Marine energy efficiency consultants and eco-labeling programs
• Buyers and procurement specialists assessing operational costs

Practical Implications:

• Adoption will drive more accurate energy ratings, inform consumer choices, and support regulatory initiatives for emission reduction and sustainable boating.
• Operators gain insight into actual vs. claimed energy use, operational cost forecasting, and environmental impact assessment.

Key highlights:

• Measures energy usage across all small craft up to 24m, regardless of propulsion source
• Enables direct efficiency comparisons between boats and engine types
• Supports environmental and sustainability assessment for marine operations

Access the full standard:View ISO/TS 25128:2026 on iTeh Standards

ISO 24375:2026 - Model Tests for Ships and Offshore Structures in Snow-Covered Ice

Ships and marine technology — Model tests for ships and offshore structures in snow-covered ice

ISO 24375:2026 fills a crucial gap in marine research and polar engineering by providing a uniform methodology for conducting scale model tests of ships and offshore platforms moving through snow-covered ice. This is particularly vital for Arctic and sub-Arctic operations, where snow cover dramatically alters ice resistance and load profiles.

What It Covers:

• Physical modeling of snow-covered ice for laboratory tests
• Detailed facility and instrumentation requirements (ice basins, load sensors, video/data acquisition)
• Standardized methods for simulating natural and artificial snow cover
• Ice resistance and ice load testing methodologies for both ships and offshore structures
• Precise instructions for data capture, correction factors, and scaling laws for extrapolation to full-scale performance

Key Requirements and Specifications:

• Snow-Covered Ice Simulation: Multiple approaches for snow modeling, including natural field collection and artificial laboratory generation, each with guidelines for measuring snow thickness, density, and crystalline structure
• Test Procedure: States conditions for stable testing (avoiding water infiltration), correct model setup, and highly instrumented measurement collection
• Data Analysis: Detailed correction for real-world scaling, ice thickness, flexural strength, friction coefficients, and extrapolation to prototype performance
• Documentation: Comprehensive requirements for recording experimental design, environmental conditions, and results — ensuring reproducibility and comparison

Who Needs to Comply:

• Designers and engineers of Arctic-capable ships and offshore platforms
• Model testing facilities and marine research institutes
• Naval architects and class societies involved in Polar Code compliance
• Owners and operators of vessels operating in snow/ice regions

Practical Implications:

• Provides credible, reproducible data for hull optimization and risk assessment in ice-covered waters
• Enhances confidence in Arctic design and regulatory approval, facilitating safer and more efficient polar expeditions and resource development
• Emphasizes snow as a key variable impacting resistance and ice-structure interaction

Key highlights:

• Standardizes snow modeling techniques for tank/basin tests
• Defines calibration, data collection, and correction protocols
• Central to Polar Code safety, class approval, and ice-capable vessel design

Access the full standard:View ISO 24375:2026 on iTeh Standards

Industry Impact & Compliance

The September 2026 standards release signals several transformative outcomes for the marine sector:

• Safety and Liability: ISO 12215-9:2026 mandates rigorous assessment and documentation, reducing the risk of catastrophic appendage failures. Shipbuilders, surveyors, and owners face heightened responsibility for structural integrity and fatigue management.
• Sustainability and Performance Transparency: ISO/TS 25128:2026 empowers operators and regulators to baseline and compare propulsion energy consumption, accelerating progress toward decarbonization and cost efficiency.
• Arctic Expansion and Risk Reduction: ISO 24375:2026 provides a credible, harmonized benchmark for ice-capable designs and ice-resistance testing—a must for Polar Code compliance and Arctic infrastructure development.

Compliance Considerations and Timelines:

• Industry adoption of these standards is mandatory for new builds and major retrofits in many jurisdictions, and is increasingly specified by insurers, class societies, and client contracts
• Implementation timelines may vary; organizations are encouraged to update quality management systems, staff training, and procurement requirements promptly to reflect the new norms
• Early adoption brings competitive advantage: improved safety reputation, smoother certification, and operational cost savings.

Benefits of Compliance:

• Enhanced safety, reliability, and market access
• Ability to demonstrate due diligence and regulatory alignment
• Operational efficiencies and environmental stewardship
• International interoperability (especially vital for global fleets and cross-border operations)

Risks of Non-Compliance:

• Increased liability, insurance challenges, and reputational risk
• Restricted access to regulated waters and contracts
• Potential for catastrophic failures and accidents

Technical Insights

Common Technical Themes Across the Standards

• Testing and Documentation: Each standard emphasizes thorough, transparent measurement, robust data collection, and clear presentation of results.
• Modeling and Analysis: Integrated use of advanced computational methods (e.g., 3D FEA for stress; scaling laws for ice resistance) and simplified but validated formulae—enabling adaptation to the resources and expertise available at each shipyard or lab.
• Materials and Fatigue Management: Increased focus on special material properties (including FRPs, high-strength steels, and welds), proper bolting, and long-term fatigue resistance for safety-critical components.

Best Practices for Implementation

1. Update Design Protocols: Incorporate new load cases, test methods, and compliance forms into design and engineering workflows.
2. Invest in Training: Ensure engineering, quality, and production personnel are familiar with the revised standards and key changes.
3. Collaborate with Testing Partners: For propulsion energy and ice-model tests, work closely with accredited labs to ensure methods and results align with the latest ISO protocols.
4. Audit and Review: Regularly audit existing practices and vessel documentation for conformity—and update product information and safety manuals accordingly.

Testing and Certification Considerations

• Third-Party Verification: Leverage recognized testing facilities for model tank tests, materials assessment, and energy performance validation.
• Documentation and Traceability: Maintain comprehensive, easily retrievable records of compliance methods, load case analyses, and test data to streamline certification and incident response.
• Continuous Improvement: Use feedback from real-world operations and testing campaigns to inform iterative improvements—not just compliance, but genuine innovation.

Conclusion / Next Steps

The September 2026 standards revisions for shipbuilding and marine structures represent a decisive step towards a safer, more efficient, and environmentally responsible maritime industry. As the sector adapts to heightened operational demands and stricter regulations, these new ISO publications will form a cornerstone of best practice for years to come.

Key Recommendations:

• Proactively review and integrate these standards into your design, engineering, and procurement processes.
• Educate staff and stakeholders on their significance and implementation nuances.
• Engage with international standards platforms such as iTeh Standards to stay current and access up-to-date documents and resources.

Stay competitive, compliant, and future-ready:Explore the latest shipbuilding and marine standards on iTeh Standards