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A: Requirements to Design [Table of Contents] A200: Structural requirements

DNV-OS-C502 Offshore Concrete Structures

[-] Sec.5: Loads and Analyses Requirements
[-] A: Requirements to Design
[-] A100: General

Sec.5
A 100   General

Sec.5 A
101   The engineering of a fixed/floating offshore concrete platform shall be performed in such a way that all functional and operational requirements relating to the safety of the installation and its operation are met, as well as those requirements relating to its functions as an offshore facility.

Sec.5 A
102   The functional requirements will affect the layout of the structure including the loading scenarios that will have to be considered in the design of the structure. The functional requirements will be related to both the site-specific conditions as well as the requirements to the platform as a production facility for the production of hydrocarbons, or other activities in the operations of a field.

Site related Functional Requirements

Sec.5 A
103   The platform shall be positioned and oriented on site such that it takes account of the reservoir, other platforms, governing wind and wave direction, accessibility of ships and helicopters and safety in case of fire or leakages of hydrocarbons.

Environmental Considerations

Sec.5 A
104   There shall be a site-specific evaluation of all types of environmental conditions that can affect the layout and design of the structure, including rare events with a low probability of occurrence.

Sec.5 A
105   The deck elevation shall be determined in order to give an adequate air gap, based on site-specific data, allowing the passage of extreme wave crests higher than the design wave crest and taking due account of possible interacting ice or icebergs (if relevant). Interaction with deck supports and underwater caisson effects.

Sec.5 A
106   The water depth used in establishing layout and in the design shall be based on site-specific data taking due account of potential settlements, subsidence, etc.

Facility Operational Requirements

Sec.5 A
107   The functional requirements to be considered related to the production/operational system are such as:

  1. layout of production wells, risers and pipelines, etc.
  2. storage volume, compartmentation, densities, temperatures, etc. in case of stored products
  3. safeguards against spillage and contamination
  4. access requirements both internal and external, both for operation, inspection and condition monitoring, etc.
  5. interface to topsides/plant
  6. installations for supply boats and other vessels servicing the platform/installation.


Sec.5 A
108   All hazard scenarios that can be associated with the operations/maloperations and the functions of the platform shall be established and evaluated, such as fire, explosions, loss of intended pressure differentials, flooding, leakages, rupture of pipe systems, dropped objects, ship impacts, etc. The platform/installation shall be designed to give adequate safety to personnel and an adequate safety against damage to the structure or pollution to the environment.
A: Requirements to Design [Table of Contents] A200: Structural requirements