ISO 19901-7:2026

Overview

ISO 19901-7:2026 specifies the requirements and methodologies for the design, analysis, evaluation, and integrity management of stationkeeping systems for floating offshore structures and mobile offshore units. Originally tailored for the oil and gas industry, this international standard is now widely adopted in the renewable energy sector, particularly for floating wind applications. Its comprehensive approach covers all life cycle phases - from mooring system component selection and system configuration to installation, post-installation assessment, and ongoing integrity management.

Stationkeeping systems maintain the position and orientation of offshore floating structures in challenging marine environments, ensuring operational safety and asset reliability. ISO 19901-7:2026 addresses these critical needs for floating energy production units, drilling vessels, construction ships, and more.

Key Topics

• Coverage of Stationkeeping System Types

  • Spread mooring systems
  • Single point mooring systems
  • Dynamic positioning systems
  • Thruster-assisted mooring systems

• Design and Analysis Methodologies

  • Deterministic approaches for ULS (Ultimate Limit States), SLS (Serviceability Limit States), and FLS (Fatigue Limit States)
  • Functional, safety, and planning requirements
  • Limit state assessment considering wind, wave, current, and ice actions

• Component and System Specification

  • Requirements for steel chain, steel wire, and synthetic fibre rope mooring lines
  • Selection and design of anchors, buoys, connectors, and monitoring equipment
  • On-vessel and off-vessel hardware evaluation

• Lifecycle Management

  • Installation, test loading, and as-installed surveys
  • Integrity management, inspection, and monitoring strategies
  • Data and documentation for traceability and conformity assessment

• Environmental and Site Data

  • Incorporation of metocean data (waves, wind, currents)
  • Geotechnical, geophysical, and bathymetric input requirements
  • Consideration of marine growth, ice-related conditions, and regional factors

• Exclusions

  • Not applicable to stationkeeping systems without redundancy (e.g., single anchor leg moorings)
  • Does not cover systems using tendons or soft yoke structures

Applications

ISO 19901-7:2026 is vital for a variety of floating offshore operations, offering practical guidance and global alignment in stationkeeping system safety and reliability. Typical applications include:

• Oil & Gas Platforms
  Design and operation of FPSOs (Floating Production Storage and Offloading units), semi-submersibles, and drillships.

• Renewable Energy Structures
  Floating wind turbines and future green energy applications relying on stationkeeping integrity and risk management.

• Mobile Offshore Units (MOUs) and Construction Units Site-specific assessment for drilling units, accommodation platforms, heavy-lift vessels, and pipelay barges.

• Lifecycle Integrity Management Effective planning and execution of inspection, maintenance, and integrity programs for offshore mooring systems.

• Cross-Industry Use While primarily for the energy sector, the methodology is adaptable for floating structures in other marine industries at the discretion of relevant authorities.

Related Standards

• IEC 61400-3-2: Wind energy generation systems - Part 3-2: Design requirements for floating offshore wind turbines (integrates ISO 19901-7 methodologies)
• ISO 19900 Series: General requirements for offshore structures
• ISO 19901-4: Geotechnical and foundation design aspects, supporting anchor system analysis
• ISO 19906: Additional requirements for Arctic offshore structures, including ice-prone environments

Adhering to ISO 19901-7:2026 ensures compliance with internationally recognized best practices for offshore stationkeeping, supporting asset safety, environmental protection, and long-term operational efficiency in both conventional and renewable offshore applications.