Overview
EN ISO 19903:2019 (ISO 19903:2019) is an international standard for concrete offshore structures used in the petroleum and natural gas industries and for concrete structures supporting nationally important power generation, transmission or distribution facilities. The standard specifies requirements and provides recommendations for fixed, floating and grounded concrete offshore structures. It addresses the full lifecycle: design, construction, transportation, installation, in‑service inspection, possible removal, and assessment of structures for continued operation or reuse at other locations. The document supports the engineering processes required by the major disciplines to establish safe, durable offshore facilities.
Key technical topics and requirements
The standard covers a broad set of technical areas, including:
- General requirements: planning, quality systems, personnel qualifications, documentation and functional requirements for offshore position and operation.
- Structural requirements: overall structural concepts, materials requirements, execution and temporary-phase considerations.
- Design requirements: definition of design actions, design resistance, material characteristic values and partial factors, and design by testing.
- Environmental actions: treatment of wave, current, seismic and ice actions and their effects on concrete offshore platforms.
- Other actions: permanent, variable, imposed deformations and accidental actions; combinations and partial factors for actions.
- Structural analysis: physical representation (geometry, material properties, soil–structure interaction), static and dynamic analysis methods, non-linear, probabilistic and reliability analysis approaches.
- Inspection and assessment: requirements for in‑service inspection, assessment of structures in service, and criteria for reuse or removal.
These topics are reflected across the standard’s structured clauses (scope; terms; symbols; general, structural and design requirements; actions; analysis methods; and inspection/assessment).
Practical applications
This standard is used to:
- Guide the design and detailed engineering of new concrete offshore platforms and supporting structures.
- Define construction, transportation and installation practices and acceptance criteria.
- Establish in‑service inspection programs and methods for assessing fitness-for-service and remaining life.
- Support decisions on reuse or decommissioning/removal of concrete offshore installations.
- Provide a harmonized technical basis for regulatory compliance, procurement specifications and contract requirements.
Who should use this standard
- Offshore structural, civil and marine engineers
- Design and detailing engineers for concrete platforms
- Fabrication, construction and installation contractors
- Asset operators, inspection and integrity management teams
- Regulators, owners and project managers involved in offshore petroleum, natural gas and critical power infrastructure
Related standards and context
- Prepared under ISO/TC 67 with endorsement by CEN (EN ISO 19903:2019).
- Supersedes and updates previous editions (EN ISO 19903:2006 / SIST EN ISO 19903:2007).
Keywords: concrete offshore structures, ISO 19903:2019, petroleum and natural gas industries, offshore platform design, in‑service inspection, structural analysis, wave actions, seismic actions.
