Overview
EN ISO 19900:2019 (ISO 19900:2019) establishes the general requirements and recommendations for the design and assessment of offshore structures used in the petroleum and natural gas industries. It applies to both bottom-founded (fixed) and buoyant (floating) structures across all life phases - fabrication, transportation, installation, in‑service operation (including life extensions), and decommissioning/removal. The standard covers new-build design as well as structural integrity management and assessment of existing platforms. It does not apply to subsea/riser systems or pipeline systems.
Keywords: ISO 19900, offshore structures, petroleum and natural gas industries, design and assessment, structural integrity.
Key Topics and Technical Requirements
- Fundamental requirements for structural integrity, functionality, durability and robustness throughout the structure’s life cycle.
- Basis for design/assessment: site location, orientation, physical environmental conditions and geotechnical/geophysical investigation requirements.
- Development of design/assessment situations including classification of hazards, exposure levels, and operational/abnormal/extreme/accidental situations.
- Limit state verification framework covering ultimate, serviceability, fatigue and accidental limit states; procedures for verification and representative values.
- Actions and loading: classification and representative values for permanent, operational, environmental and accidental actions, and repetitive loading relevant to offshore platforms.
- Design values and partial factors covering actions, resistances and combinations for limit state checks.
- Specific design considerations referenced for topsides, deck elevation, splash zone, stationkeeping systems, foundations/anchoring and conductor/ structural interfaces.
- Requirements for planning, construction, deployment, inspection, maintenance and decommissioning to support durability and structural integrity management.
Keywords: limit states, environmental actions, design values, partial factors, fatigue, geotechnical conditions.
Practical Applications
- Establishing the design basis and verification approach for new offshore platforms (fixed or floating).
- Conducting structural integrity assessments and fitness‑for‑service evaluations for existing installations and life‑extension projects.
- Developing inspection, maintenance and decommissioning plans consistent with durability and robustness requirements.
- Supporting regulatory compliance, class society certification and operator risk management by defining actions, combinations and limit‑state procedures.
Keywords: structural integrity management, life‑cycle, inspection, decommissioning, offshore platform design.
Who Should Use This Standard
- Offshore structural, marine and civil engineers
- Asset owners and operators in the petroleum and natural gas industries
- Class societies and regulatory authorities
- Inspection, maintenance and integrity management teams
- Fabricators and contractors involved in construction, transport and installation
Related Standards
This document is the general‑requirements reference in the ISO/CEN offshore standards family and is typically used alongside platform‑type and discipline‑specific standards and guidance for metocean, geotechnical and equipment design.
Keywords: ISO offshore standards, EN ISO 19900, offshore design guidance.