ISO 19902:2020

Overview

ISO 19902:2020 - "Petroleum and natural gas industries - Fixed steel offshore structures" is the ISO international standard that specifies requirements and provides recommendations for the planning, engineering, design, fabrication, transportation, installation and, where relevant, removal of fixed steel offshore structures. It covers a broad range of fixed steel structures used in oil and gas offshore projects, including caissons (free‑standing and braced), jackets, monotowers and towers, and is also applicable to compliant bottom‑founded structures, steel gravity structures, jack‑ups and related items (underwater storage tanks, bridges and connecting structures).

This standard is essential for organizations involved in offshore steel structures design, ensuring uniform safety, reliability and performance expectations for fixed platforms in the petroleum and natural gas industries.

Key Topics and Requirements

ISO 19902:2020 addresses the full lifecycle and technical discipline areas needed for safe fixed platform delivery:

• Types of fixed steel offshore structures: definitions and scope for jackets, towers, monotowers, caissons and related structures.
• Planning and design considerations: hazards identification, design situations, service and operational factors, access, maintenance and safety considerations.
• Material and structural requirements: material properties for steel, limit state design, determination of component resistances and reserve strength.
• Actions and loadings: pre‑service, transportation and installation actions; in‑place actions including permanent (G), variable (Q) and extreme metocean actions from wind, waves and current; vortex induced vibrations (VIV) and dynamic response representation.
• Structural analysis and modelling: robust modelling practices, reliability analysis, strength and stability checks, indirect actions.
• Fabrication, transportation and installation: loadout, lifting, launching, marine operations and tolerance/dynamic effects during installation.
• Inspection, maintenance and reuse: design for inspection/maintenance, assessment of existing structures and reuse considerations.
• Environmental and safety: selecting metocean parameters, environmental exposure levels and regulatory considerations.

Practical Applications and Users

ISO 19902:2020 is intended for professionals and organizations in the offshore oil & gas value chain:

• Offshore structural engineers and designers working on fixed platform and jacket design
• Project engineers and EPC contractors responsible for fabrication, loadout, transportation and installation
• Asset integrity, inspection and maintenance teams assessing existing fixed steel structures
• Regulators, classification societies and consultants preparing site‑specific assessments and compliance documentation
• Procurement and QA/QC teams ensuring materials, welding and lifting practices meet standard requirements

Using ISO 19902 helps reduce technical risk, align designs with international best practices and improve safety and reliability of fixed offshore platforms.

Related Standards

• ISO 19901‑3 (topsides structures)
• ISO 19901‑6 (marine operations)
• ISO 19901‑9 (structural integrity management)
• ISO 19905‑1 (site‑specific jack‑up assessment)
• ISO 19906 (arctic fixed steel offshore structures)