ISO 19900:2019

Overview

ISO 19900:2019 - Petroleum and natural gas industries - General requirements for offshore structures establishes the overarching requirements and recommendations for the design, assessment and life‑cycle management of bottom‑founded (fixed) and buoyant (floating) offshore structures. It applies across all life phases - fabrication, transportation, installation, in‑service operation (including life extension) and decommissioning - but does not cover subsea/riser or pipeline systems.

Key topics and technical requirements

ISO 19900:2019 frames the technical basis for structural integrity and safe performance of offshore platforms. Core topics include:

• Fundamental requirements: structural integrity, functionality, durability, robustness, and phase‑specific obligations (planning, construction, operation, decommissioning).
• Basis for design/assessment: platform location/orientation, physical environmental and geotechnical/geophysical conditions, site investigation and seabed considerations.
• Structural elements: guidance for topsides, deck elevation, splash zone, stationkeeping systems, foundations and anchoring, conductor/riser interfaces.
• Design situations and hazards: classification of hazards, exposure levels, and development of operational, extreme, abnormal, accidental and serviceability design/assessment situations.
• Limit state verification: concepts for ultimate, abnormal/accidental, serviceability and fatigue limit states and representative variable selection.
• Actions and loading: classification and representative values for permanent, operational, environmental, accidental and repetitive actions.
• Design values and partial factors: treatment of actions in combination, resistance values, geometric and material uncertainties, and partial factor frameworks.
• Models, analysis and quality management: recommended modelling, verification, inspection regimes, documentation, and record keeping.
• Assessment of existing structures: condition assessment, action and resistance evaluation, failure consequence analysis and mitigation options.

Applications and users

ISO 19900:2019 is essential for professionals involved in offshore structural engineering and asset management, including:

• Offshore structural and civil engineers designing fixed and floating platforms
• Structural integrity and fitness‑for‑service assessors
• Asset owners/operators planning lifecycle management, life extension or decommissioning
• Classification societies, regulators and engineering contractors developing specification and acceptance criteria
• Inspection, maintenance and quality management teams ensuring safe in‑service performance

Use ISO 19900:2019 to align designs and assessments with internationally recognized requirements for offshore structure safety, durability and reliability.

Related standards

ISO 19900 is a general requirements document intended to be used with more specialized standards and normative references covering specific design methods, materials, fatigue, geotechnical guidance and platform systems. When applying ISO 19900:2019, consult applicable ISO and industry standards for detailed calculations, material properties and system‑specific rules.