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      • CAN/CSA-Z19901-2-07 (R2016)

      Codes & Standards - Purchase

      CAN/CSA-Z19901-2-07 (R2016)

      Petroleum and Natural Gas Industries - Specific Requirements for Offshore Structures - Part 2: Seismic Design Procedures and Criteria (Adopted ISO 19901-2:2004, first edition, 2004-11-15, with Canadian deviations)
      SKU: 2418223 Published by CSA Group Publication Year 2007 Reaffirmed in 2016 74 pages Withdrawn

      Product Details

      • Preface/Scope

      CSA Preface


      This is the first edition of CAN/CSA-Z19901-2, Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria, which is an adoption, with Canadian deviations, of the identically titled ISO (International Organization for Standardization) Standard 19901-2 (first edition, 2004-11-15). At the time of publication, ISO 19901-2:2004 is available from ISO in English only. CSA will publish the French version when it becomes available from ISO.


      Scope


      This part of ISO 19901 contains requirements for defining the seismic design procedures and criteria for offshore structures; guidance on the requirements is included in Annex A. The requirements are applicable to fixed steel structures and fixed concrete structures. The effects of seismic events on floating structures and partially buoyant structures are also briefly discussed. The site-specific assessment of jack-ups in elevated condition is only covered in this part of ISO 19901 to the extent that the requirements are applicable.


      Only earthquake-induced ground motions are addressed in detail. Other geologically induced hazards such as liquefaction, slope instability, faults, tsunamis, mud volcanoes and shock waves are mentioned and briefly discussed.


      The requirements are intended to reduce risks to persons, the environment, and assets to the lowest levels that are reasonably practicable. This intent is achieved by using:


      a) seismic design procedures which are dependent on the platform's exposure level and the expected intensity of seismic events;


      b) a two-level seismic design check in which the structure is designed to the ultimate limit state (ULS) for strength and stiffness and then checked to abnormal environmental events or the accidental limit state (ALS) to ensure that it meets reserve strength and energy dissipation requirements.


      For high seismic areas and/or high exposure level fixed structures, a site-specific seismic hazard assessment is required; for such cases, the procedures and requirements for a site-specific probabilistic seismic hazard analysis (PSHA) are addressed. However, a thorough explanation of PSHA procedures is not included.


      Where a simplified design approach is allowed, worldwide offshore maps are included in Annex B that show the intensity of ground shaking corresponding to a return period of 1 000 years. In such cases, these maps may be used with corresponding scale factors to determine appropriate seismic actions for the design of a structure.


      NOTE For design of fixed steel offshore structures, further specific requirements and recommended values of design parameters (e.g. partial action and resistance factors) are included in ISO 19902, while those for fixed concrete offshore structures are contained in ISO 19903. Specific seismic requirements for floating structures are to be contained in ISO 19904[2], for site-specific assessment of jack-ups and other MOUs in ISO 19905[3], for arctic structures in ISO 19906[4] and for topsides structures in ISO 19901-3[1].

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