ISO/DIS 19900:2025

This document specifies general provisions for the design and assessment of fixed (bottom-founded) and floating (buoyant) offshore structures. This document contains general provisions for the design of new structures and site assessment of existing structures. This document is applicable for all phases of the life of the structure, including: ¾ pre-service (e.g., fabrication, transportation, installation), ¾ service in-place, both during originally specified design service life and during any life extensions, ¾ functional upgrade, repurpose and reuse, and ¾ decommissioning, and removal. This document focusses on primary and secondary load bearing structure but also provides some provisions for tertiary and ancillary structure. NOTE ISO 24201[22] covers the design of stairs, gratings and handrails. This document was initially created for offshore oil & gas structures but is now also applicable to renewable energy offshore structures. This document does not apply to pipelines, risers or subsea systems.