DNV DNV-OS-C502 [ Revised ]

Scope and applications

The standard is applicable to Design, Construction, Inspection and Maintenance of Offshore Concrete Structures, using concrete as the structural material in the support structure as defined in 302 below.

The standard can be used in the structural design of the following types of support structures:

— GBS (Gravity Based Structures) offshore concrete structures for oil/gas production

— GBS structures for oil/gas production with oil storage facility

— Floating concrete structures for production of oil/gas. The structure may be of any type floating structure, i.e. Tension leg platform (TLP), Column stabilised units and Barge type units

— Concrete harbours

— Artificial concrete export/import harbours, either floating or fixed and with storage facilities, allowing transport of articles and goods with small boats to the artificial harbour for reloading on large sea going vessels. Cargo may be different types or ore or oil/gas

— Deep water caisson type concrete foundation of bridges

— Floating foundations for bridges, parking houses or storage buildings.

Appendices A to F are appended to the standard. These appendices contain guidelines for the design of Offshore Concrete Structures.

Floating Offshore Concrete structures shall be designed with freeboard and intact stability in accordance with DNVOS- C301. For temporary phases the stability shall be in accordance with DNV Rules for Planning and Execution of Marine Operations.

The development and design of new concepts for Offshore Concrete Structures requires a systematic hazard identification process in order to mitigate the risk to an acceptable risk level. Hazard identification is therefore a central tool in this standard in order to identify hazards and mitigate these to an acceptable risk level.