This International Standard is applicable to the following types of fixed steel offshore structures for the petroleum and natural gas industries: free-standing caissons, jackets, monotowers, towers. It contains requirements for planning and engineering of the tasks design, fabrication, transportation and installation of new structures as well as their future removal in-service inspection and integrity management of both new and existing structures, assessment of existing structures and evaluation of structures for reuse at different locations. ISO 19902 applies to compliant bottom-founded structures, gravity structures, jack-ups, other bottom-founded structures and other structures related to offshore structures, such as underwater oil storage tanks, bridges, and connecting structures, only to the extent to which the requirements are relevant.