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      • CSA ISO 19901-2:20

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      CSA ISO 19901-2:20

      Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2: Seismic design procedures and criteria (Adopted ISO 19901-2:2017, second edition, 2017-11)

      SKU: 2702650 Published by CSA Group Publication Year 2020 Reaffirmed in 2016

      Product Details

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      CSA Preface


      This is the second edition of CSA ISO 19901-2, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2: Seismic design procedures and criteria, which is an adoption without modification of the identically titled ISO (International Organization for Standardization) Standard 19901-2 (second edition, 2017-11). It supersedes the previous edition, published in 2007 as CAN/CSA-Z19901-2 (adopted ISO 19901-2:2004).


      Standards development within the Canadian Offshore Structures sector is harmonized with international standards development.


      This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.


      Scope


      This document contains requirements for defining the seismic design procedures and criteria for offshore structures; guidance on the requirements is included in Annex A. The requirements focus on fixed steel offshore structures and fixed concrete offshore structures. The effects of seismic events on floating structures and partially buoyant structures are briefly discussed. The site-specific assessment of jack-ups in elevated condition is only covered in this document 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 busing:


      a) seismic design procedures which are dependent on the exposure level of the offshore structure 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 abnormal limit state (ALS) to ensure that it meets reserve strength and energy dissipation requirements.


      Procedures and requirements for a site-specific probabilistic seismic hazard analysis (PSHA) are addressed for offshore structures in high seismic areas and/or with high exposure levels. However, a thorough explanation of PSHA procedures is not included.


      Where a simplified design approach is allowed, worldwide offshore maps, which are included in Annex B, 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.


      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. Seismic requirements for floating structures are contained in ISO 19904, for site-specific assessment of jack-ups and other MOUs in ISO 19905 (all parts), for arctic structures in ISO 19906 and for topsides structures in ISO 19901-3.

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      CSA ISO 19901-2:20

      Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2: Seismic design procedures and criteria (Adopted ISO 19901-2:2017, second edition, 2017-11)

      Active
      English

      CSA ISO 19901-2:F20

      Industries du pétrole et du gaz naturel — Exigences spécifiques relatives aux structures en mer — Partie 2 : Procédures de conception et critères sismiques (norme ISO 19901-2:2017 adoptée, deuxième édition, 2017-11)

      Active
      French

      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)

      Withdrawn
      English
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