This Standard specifies minimum requirements for and provides guidance on design principles, safety levels, and loads in connection with the design, construction, transportation, installation, and decommissioning of offshore structures.
This Standard is intended to cover all offshore structures and all parts of offshore structures (including the main deck and topside structures), whether they are of steel, reinforced concrete, composite, hybrid, or earth-filled construction.
Although this Standard may be applied to floating offshore structures, it does not provide a complete set of design requirements for floating offshore structures. Users are strongly advised to seek additional guidance from publicly available international standards regarding the design of floating offshore structures.
(1)This Standard does not provide specific requirements for the operation, maintenance, service-life inspection, or repair of offshore structures.
(2)Mechanical and electrical equipment and any specialized equipment associated with offshore operations are not covered by this Standard except insofar as offshore structures must be able to safely sustain the loads imposed by the installation, housing, and operation of such equipment.
Alternative design method
An alternative design method based on theoretical analysis and recognized engineering practice may be used in lieu of the design method provided in this Standard. The alternative design method is to provide levels of safely and serviceability that are at least equal to those provided by the requirements of this Standard.
Note:The intent of this clause is to allow design methods that are not totally in accordance with the requirements of the Standard, but can be justified by proven performance or by theory and analysis based on special investigations. Such investigations might include
(a) evaluation of a full-scale structural element or a prototype structure by a loading test, supplemented by calculations as required;
(b) studies of a scale model or a combination of model tests and calculations; or
(c) observed behaviour of existing structures similar to the one being designed.
The key point of this clause is that the levels of safety and serviceability required by the Standard must be achieved by whatever design method is used.
Novel or special structural elements may be used if they are designed using analytical and engineering principles and reliable test data that demonstrate that the levels of safety and serviceability provided are at least equal to those provided by the requirements of this Standard.
Each investigation, analysis, design activity, construction activity, inspection, and monitoring activity described in this Standard is to be performed by or under the supervision of one or more competent persons who have demonstrated experience relevent to the activity and are professionally licensed in Canada as engineers, geologists, or geophysicists.
In CSA Standards, "shall" is used to express a requirements, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Legends to equations and figures are considered requirements.
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