ISO 19901-3-2024 PDF

Full title and description

Oil and gas industries including lower carbon energy — Specific requirements for offshore structures — Part 3: Topsides structure (ISO 19901-3:2024). This part provides requirements, guidance and information for the design, fabrication, installation, modification and structural integrity aspects of topsides structures for offshore platforms and module units.

Abstract

The standard specifies requirements and guidance for topsides structures in pre‑service, in‑service and post‑service conditions. It covers design and fabrication principles, action effects on structural components, provisions for in‑service inspection and integrity management, assessment of existing topsides, reuse and decommissioning, and prevention/control/assessment of fire, explosions and other accidental events. It references other parts of the ISO 19901 series for actions such as wind, seismic and fatigue where appropriate.

General information

• Status: Published (current international standard).
• Publication date: January 2024 (Edition 3, 2024‑01).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.180.10 (exploratory, drilling and extraction equipment; offshore structures).
• Edition / version: Edition 3 (2024).
• Number of pages: 151 (ISO bibliographic record shows 151 pages for the English edition).

Scope

Applies to topsides of fixed offshore structures, discrete topsides/modules placed on hulls of floating offshore structures and mobile offshore units, and to topsides of arctic offshore structures (excluding winterization covered by ISO 19906). The part is intended to be used together with other ISO 19901 series documents and relevant national or class rules where applicable, and it addresses structural components such as decks, module supports, flare structures, crane pedestals, helidecks, permanent bridges and masts/towers on offshore structures.

Key topics and requirements

• Design and fabrication requirements for topsides structural components (primary and secondary structure, module support frames, decks).
• Action definitions and action effects on topsides components with references to ISO 19901‑1 (wind), ISO 19901‑2 (seismic) and ISO 19902 (fatigue) where relevant.
• In‑service inspection, structural integrity management and assessment procedures for existing topsides.
• Requirements for modifications, reuse, decommissioning and removal with emphasis on structural integrity.
• Provisions for prevention, control and assessment of fire, explosions and other accidental events affecting topsides.
• Guidance on selecting and applying national building codes (correspondence factors) for determination of resistance of rolled and welded non‑circular prismatic components and connections.

Typical use and users

Used by offshore structural and mechanical engineers, EPC contractors, operators and owners of offshore installations, classification societies, inspection and maintenance organizations, regulatory bodies and consultants involved in design, modification, inspection and integrity management of topsides structures on oil, gas and lower‑carbon offshore facilities.

Related standards

Part of the ISO 19901 series and intended to be used alongside: ISO 19901‑1 (wind actions), ISO 19901‑2 (seismic actions), ISO 19902 (fixed steel offshore structures / fatigue design), ISO 19903, ISO 19904‑1, ISO 19905‑1 and ISO 19906 (arctic and winterization matters). ISO 19901‑9 covers structural integrity management referenced in this part.

Keywords

topsides, offshore topsides, offshore structures, topsides structure, structural design, in‑service inspection, integrity management, fire and explosion, module support frames, fatigue, ISO 19901 series.

FAQ

Q: What is this standard?

A: ISO 19901‑3:2024 is the part of the ISO 19901 series that specifies specific requirements and guidance for topsides structures of offshore oil, gas and lower‑carbon energy installations, covering design, fabrication, inspection and integrity topics.

Q: What does it cover?

A: It covers topsides structural elements (decks, module supports, flares, helidecks, crane supports, bridges, masts/towers), actions and action effects on those components, provisions for fabrication, inspection, assessment, modification, reuse, decommissioning and accidental events (fire/explosion).

Q: Who typically uses it?

A: Structural engineers, offshore designers, operators, EPC firms, classification societies, inspectors and regulators working on offshore platform topsides and module installations.

Q: Is it current or superseded?

A: Current — ISO 19901‑3:2024 (Edition 3, published January 2024) is the up‑to‑date edition and supersedes the 2014 edition.

Q: Is it part of a series?

A: Yes — it is Part 3 of the ISO 19901 series (Specific requirements for offshore structures) and is intended to be used with other parts of that series and applicable national or class rules.

Q: What are the key keywords?

A: Topsides, offshore structures, structural integrity, in‑service inspection, design and fabrication, module support, fire/explosion mitigation, ISO 19901.