: API 2EQ replaces the older API 2A-WSD seismic maps with ISO 19901-2 site seismic zones and specific maps in Figure B.2 of the document.
The updated document expands its Table 4-8 (fatigue detail categories) to include bolted ring-flange connections and grouted connections. These have been the source of failures in early offshore wind designs. The new PDF provides specifically derived from full-scale testing on grouted monopile-to-transition-piece connections.
The standard's overarching goal is to reduce risks "to persons, the environment, and assets to the lowest levels that are reasonably practicable". This risk-based approach is operationalized by its two-tiered design checks, which consider both the platform's (the consequences of failure) and the expected intensity of seismic events at its location.
Seismic Design Procedures and Criteria for Offshore Structures