It specifically subsea pipelines, risers, and process piping, which are covered by other specialized offshore standards.
EN 10225-1:2019 - Weldable Steel Plates for Fixed Offshore Structures en 10225-1 pdf
Up to and including 150 mm .
This part of the standard applies specifically to steel . It defines strict thickness limits based on the steel's delivery condition and yield strength: S355NLO (Normalized): Up to and including 200 mm . It specifically subsea pipelines