February 2026: Major Updates in Shipbuilding and Marine Structures Standards

In February 2026, the marine engineering world received a significant boost with the release of five new international standards shaping the future of shipbuilding and marine structures. These newly published ISO standards introduce robust requirements and comprehensive specifications for autonomous underwater vehicle (AUV) risk management, high-manganese steel products for cryogenic applications, and advanced electrical propulsion systems for small craft. Designed for professionals responsible for quality assurance, risk mitigation, procurement, and compliance, these standards set new benchmarks for safety, reliability, and operational excellence in modern maritime technology.

Overview

Shipbuilding and marine structures underpin global trade, energy, and research. As technology advances rapidly, especially in automation, material science, and sustainable propulsion, keeping up with international standards is essential for ensuring safety, reliability, and legal compliance. Updated standards help reduce risk, improve operational resilience, and guide investment in next-generation systems and materials. This article presents an in-depth look at the five most impactful new standards, revealing what’s changed and how professionals can leverage these updates for competitive advantage.

Detailed Standards Coverage

ISO 20682:2026 – Autonomous Underwater Vehicles — Risk and Reliability

Full Title: Autonomous underwater vehicles — Risk and reliability

This pivotal standard establishes a comprehensive framework for managing the risks and ensuring the reliability of autonomous underwater vehicles (AUVs). It addresses the digital mission architecture of AUVs, including their sensors, communication devices, and mission-critical components that influence navigation and underwater tasks.

The document defines risk assessment and dependability engineering, offering structured methodologies like fault tree analysis and state transitions (Markov chains) to support safe mission design and execution. While it covers a broad spectrum of digital and control systems, it does not extend to autonomous underwater gliders, batteries, or electric motors for AUVs.

Who Should Comply:

• AUV manufacturers
• Offshore operators
• Marine robotics integrators
• Shipowners investing in subsea robotics

Practical Implications:

• Enhanced ability to identify mission-critical risks in harsh environments (e.g., deep-sea, polar).
• Enables design verification, simulation, and validation protocols for mission safety.
• Supports operators in making informed, real-time risk decisions using digital engineering approaches.

Notable Changes:

• Introduces digital mission engineering—a novel approach for mapping six-degrees-of-freedom (DoF) movement and sensor integration.
• Formalizes simulation-driven fault analysis and recovery strategy.
• Defines safety case and dependability engineering in the context of unmanned underwater missions.

Key highlights:

• Holistic coverage of mission risks for AUVs, including extreme environment operations.
• Introduces essential reliability metrics and online uncertainty modeling.
• Details communication, redundancy, and safety strategies for improved mission success rates.

Access the full standard:View ISO 20682:2026 on iTeh Standards

ISO 18742:2026 – High-Manganese Austenitic Steel Welded Fittings for Cryogenic Temperature

Full Title: Ship and marine technology — High-manganese austenitic steel — Specification for high-manganese austenitic steel welded fittings for cryogenic temperature

Vital for the containment and transport of liquefied gases, this new ISO standard offers guidance on manufacturing and testing high-manganese austenitic steel welded fittings. It provides material, mechanical, and safety specifications for all pressure and non-pressure retaining components used in marine and onshore cryogenic systems.

The standard aligns with key international codes (IGF and IGC Codes by IMO) and is suitable for application in hull systems, cargo tanks, fuel tanks, piping, and potentially in liquefied hydrogen systems upon agreement. Health, safety, and quality requirements are extensively outlined, ensuring consistency and reliability across global marine applications.

Who Should Comply:

• Material suppliers and steel manufacturers
• Shipyards and marine contractors
• Shipping companies and asset owners

Practical Implications:

• Ensures safe operation of vessels transporting liquefied gases at extremely low temperatures.
• Standardizes quality control—including chemical composition, welding, heat treatment, and inspection protocols.
• Facilitates global sourcing of high-manganese fittings, supporting project scalability and safety.

Notable Changes:

• Brings high-manganese austenitic steel into closer compliance with IMO requirements for cryogenic service.
• Expands applicability to new fuels such as liquefied hydrogen.

Key highlights:

• Comprehensive health, safety, and quality management for fittings.
• Unified material designation (“HMW XXX”) for clarity in procurement.
• Integrates non-destructive testing and traceability requirements.

Access the full standard:View ISO 18742:2026 on iTeh Standards

ISO 16315:2026 – Small Craft – Electrical Systems Used for Electrical Propulsion

Full Title: Small craft — Electrical systems used for electrical propulsion

With the rise of environmentally friendly and hybrid propulsion, this updated standard addresses electrical system design and installation for small craft up to 24 meters in hull length. Covering both AC and DC systems (up to 1,500V DC and 1,000V AC), the standard applies to full electric and hybrid systems, specifying requirements for electrical safety, EMC, fire protection, and system control.

It provides a full suite of requirements for system designers, installers, and craftbuilders, from equipment selection and identification to testing, battery management, protective measures, and owner’s manual documentation.

Who Should Comply:

• Boatbuilders and marine electrical engineers
• Small craft system designers
• Electric propulsion suppliers
• Marine safety inspectors

Practical Implications:

• Guides the transition from fossil-fueled to electric or hybrid-powered vessels.
• Enhances safety by addressing electrical isolation, overcurrent protection, and system alarms.
• Supports marine electrification efforts for compliance with environmental and safety regulations.

Notable Changes:

• Clarified overcurrent and fault protection for isolated DC propulsion systems.
• Updated EMC and owner’s manual documentation requirements.

Key highlights:

• Design and installation rules for electric propulsion up to 24 meters hull length.
• Covers hybrid systems and modern battery technology integration.
• Rigorous fire, shock, and fault protection protocols for safe operations.

Access the full standard:View ISO 16315:2026 on iTeh Standards

ISO 18741:2026 – High-Manganese Austenitic Steel Forgings for Cryogenic Temperature

Full Title: Ship and marine technology — High-manganese austenitic steel — Specification for high-manganese austenitic steel forgings for cryogenic temperature

Building upon the push for advanced cryogenic materials, this standard lays out the minimum requirements for high-manganese austenitic steel forgings used in valves, flanges, and other components subjected to cryogenic temperatures. It details specifications for chemical composition, mechanical properties, forging procedures, nondestructive inspection, and documentation.

This guidance is essential for marine and offshore LNG/LPG applications, ensuring the safety and integrity of pressure systems under extreme conditions.

Who Should Comply:

• Forging manufacturers
• Pressure vessel designers
• Marine and offshore project teams

Practical Implications:

• Enables higher reliability in valves, flanges, and critical components for cold fluid systems.
• Standardizes mechanical testing (including impact and tensile tests) for assurance of strength and ductility at low temperatures.
• Supports traceability and documentation to streamline audits and verifications.

Notable Changes:

• New grade designations (e.g., “HMF XXX”) clarify procurement and traceability.
• Aligned with latest IMO cryogenic safety codes.

Key highlights:

• Covers all facets of manufacturing, inspection, and acceptance.
• Essential for projects dealing with liquefied natural gas (LNG), hydrogen, or similar substances.
• Emphasizes health, safety, and comprehensive documentation.

Access the full standard:View ISO 18741:2026 on iTeh Standards

ISO 18760:2026 – Longitudinally Welded High-Manganese Austenitic Steel Pipes for Cryogenic Temperature

Full Title: Ships and marine technology — High-manganese austenitic steel — Longitudinally welded high-manganese austenitic steel pipes for cryogenic temperature

Addressing the growing use of cryogenic piping in marine technology, ISO 18760 specifies delivery conditions for longitudinally welded, circular pipes of high-manganese austenitic steel. Applicable to both pressure-retaining and welded support members, the standard articulates requirements from raw material processing to final product qualification.

It harmonizes global procurement, installation, and operation of critical piping for LNG, LPG, hydrogen, and other cryogenic fluids, aligning with international safety and quality benchmarks.

Who Should Comply:

• Pipe manufacturers and suppliers
• Shipyards and fabricators
• Engineers specifying cryogenic piping for ships and terminals

Practical Implications:

• Reduces risks associated with pipe failure in extremely low-temperature environments.
• Details full lifecycle requirements: steelmaking, welding, NDT, marking, and documentation.
• Supports smooth certification and sign-off for pressure systems in new builds and retrofits.

Notable Changes:

• Introduces harmonized nomenclature for pressure and non-pressure components.
• Emphasizes comprehensive welding quality requirements aligned with ISO and ASME standards.

Key highlights:

• Addresses health, safety, and environmental protection across production and use.
• Provides detailed specifications for chemical and metallurgical properties.
• Mandates traceability and inspection, helping meet client and regulatory expectations.

Access the full standard:View ISO 18760:2026 on iTeh Standards

Industry Impact & Compliance

The publication of these five standards signifies a leap forward for the shipbuilding and marine structures industry:

• Safety & Reliability: Improvements in AUV risk management, enhanced reliability engineering, and robust cryogenic material standards directly improve operational safety and reduce the likelihood of failures at sea.
• Compliance & Certification: Adoption of these standards helps manufacturers and operators align with the latest IMO, regulatory, and classification society requirements, smoothing the path to project approvals, insurance, and certification.
• Market Access: Standardized requirements for materials and systems support smoother cross-border procurement and facilitate entry into markets demanding higher safety and quality levels.
• Timelines: Organizations introducing or upgrading to these new standards should begin gap analysis and compliance planning as soon as possible. Early implementation minimizes retrofit costs and certification delays.
• Risks of Non-Compliance: Non-compliance may result in vessel detentions, accidents, insurance challenges, and significant reputational damage.

Technical Insights

Common Technical Themes

• Material Science: All three high-manganese steel standards (ISO 18741, ISO 18742, ISO 18760) focus on the latest alloy and welding technologies for extreme cryogenic service, harmonizing with IMO codes.
• System Integration: ISO 16315 creates a bridge between modern electrical propulsion requirements and traditional marine design, emphasizing EMC, spatial layout, and interlock testing.
• Risk & Reliability Engineering: ISO 20682 formalizes risk analysis, embracing probabilistic and simulation-based verification to meet unmanned and remote operation challenges.

Implementation Best Practices

1. Conduct Gap Assessments: Review current materials, systems, and procedures against new requirements.
2. Engage Qualified Personnel: Ensure adherence to qualification protocols for welders, inspectors, and surveyors (as called for across multiple standards).
3. Document Everything: Maintain thorough traceability and documentation from procurement to installation.
4. Invest in Training: Update team skills around new testing, certification, and emergency protocols.
5. Integrated Testing: Leverage both destructive and non-destructive testing methods to validate quality.

Testing and Certification Considerations

• Adhere to analysis and testing methods cited (e.g., Charpy impact, tensile, hydrostatic, NDT, EMC, functional and safety testing).
• Coordinate certificates and compliance documentation per ISO and ASME specifications.
• Certify personnel and procedures according to referenced standards for welding and inspection.

Conclusion / Next Steps

These February 2026 standards upgrades are indispensable for anyone involved in shipbuilding and marine structures. With safety, reliability, and compliance demands rising worldwide, adopting the latest ISO standards is a strategic investment in operational excellence and risk management.

Key Takeaways:

• Autonomous underwater vehicles now benefit from a dedicated risk and reliability engineering standard.
• High-manganese austenitic steel is the new benchmark for cryogenic safety in pipes, forgings, and fittings.
• Electrical systems for small craft are better harmonized for modern propulsion needs and global compliance.

Recommendations:

• Review and implement these standards into your technical, procurement, and compliance processes.
• Stay proactive—early adoption streamlines approvals, reduces incident risk, and positions your organization as a safety and quality leader.
• Explore the full texts for details, and consult with iTeh Standards for version tracking, purchase, and updates.

Explore the latest shipbuilding and marine structures standards today at iTeh Standards!