EN ISO 19901-2:2017

Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria (ISO 19901-2:2017)

ISO 19901-2:2017 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 ISO 19901-2:2017 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 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.

Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 2: Seismische Auslegungsverfahren und -kriterien (ISO 19901-2:2017)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 2: Procédures de conception et critères sismiques (ISO 19901-2:2017)

ISO 19901-2:2017 spécifie les exigences relatives à la définition des procédures et critères de conception parasismique pour les structures en mer; les préconisations concernant les exigences sont indiquées dans l'Annexe A. Les exigences portent sur les structures en mer fixes en acier et en béton. Les effets d'événements sismiques sur les structures flottantes et partiellement flottantes sont brièvement décrits. L'évaluation, spécifique au site, des plates-formes auto-élévatrices en situation surélevée est uniquement traitée dans le présent document dans la mesure où les exigences sont applicables.
Seuls les mouvements du sol induits par des séismes sont traités en détail. D'autres risques géologiques tels que la liquéfaction, l'instabilité des pentes, les failles, les tsunamis, les volcans de boue et les ondes de choc sont également mentionnés et brièvement décrits.
Les exigences sont destinées à réduire les risques encourus par les personnes, l'environnement et les installations au niveau de risque le plus bas qui soit raisonnablement réalisable. Cette intention est atteinte à l'aide:
a)    de procédures de conception parasismique qui dépendent du niveau d'exposition de la structure en mer et de l'intensité prévue des événements sismiques;
b)    d'un contrôle de conception parasismique à deux niveaux, dans lequel la structure est conçue selon l'état limite ultime (ULS) en termes de résistance et de rigidité avant d'être confrontée à des événements environnementaux anormaux ou à l'état limite anormal (ALS), afin de garantir qu'elle satisfait aux exigences de résistance de réserve et de dissipation d'énergie.
Les procédures et exigences s'appliquant à la réalisation d'une analyse probabiliste de l'aléa sismique (PSHA), spécifique au site, sont exposées pour les structures en mer installées dans des zones à forte activité sismique et/ou fortement exposées. Cependant, ces procédures de l'étude PSHA ne sont pas expliquées de manière approfondie.
Lorsqu'une approche de conception simplifiée est admise, des cartes internationales, incluses dans l'Annexe B, indiquent l'intensité des secousses en mer pour une période de retour de 1 000 ans. Dans de tels cas, ces cartes peuvent être utilisées avec des facteurs d'échelle correspondants afin de déterminer les actions sismiques appropriées pour la conception d'une structure.
Pour la conception des structures en mer fixes en acier, d'autres exigences spécifiques et des valeurs recommandées des paramètres de conception (par exemple facteurs d'action partiels et de résistance) sont indiquées dans l'ISO 19902, tandis que celles relatives aux structures en mer fixes en béton sont énoncées dans l'ISO 19903. L'ISO 19904 intègre des exigences parasismiques relatives aux structures flottantes, l'ISO 19905 (toutes les parties) des exigences relatives à l'évaluation spécifique au site de plates-formes auto-élévatrices et autres MOU, l'ISO 19906 des exigences relatives aux structures arctiques et l'ISO 19901‑3 des exigences relatives aux superstructures.

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 2. del: Postopki potresno varnega projektiranja in potresna merila (ISO 19901-2:2017)

General Information

• Status: Withdrawn
• Publication Date: 12-Dec-2017
• Withdrawal Date: 05-Jul-2022
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• ICS: 75.180.20 - Processing equipment
• ICS: 91.120.25 - Seismic and vibration protection
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 06-Jul-2022
• Ref Project: SIST EN ISO 19901-2:2018 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria (ISO 19901-2:2017)

Relations

• Replaces: EN ISO 19901-2:2004 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria (ISO 19901-2:2004)
• Effective Date: 14-Dec-2011
• Replaced By: EN ISO 19901-2:2022 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria (ISO 19901-2:2022)
• Effective Date: 29-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2018
1DGRPHãþD
SIST EN ISO 19901-2:2005
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD3RVHEQH]DKWHYH]DQDIWQH
SORãþDGLGHO3RVWRSNLSRWUHVQRYDUQHJDSURMHNWLUDQMDLQSRWUHVQDPHULOD,62

Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 2: Seismic design procedures and criteria (ISO 19901-2:2017)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 2:
Seismische Auslegungsverfahren und –kriterien (ISO 19901-2:2017)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 2: Procédures de conception et critères sismiques (ISO 19901-2:2017)
Ta slovenski standard je istoveten z: EN ISO 19901-2:2017
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
91.120.25 =DãþLWDSUHGSRWUHVLLQ Seismic and vibration
YLEUDFLMDPL protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19901-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-2:2004
English Version
Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 2: Seismic
design procedures and criteria (ISO 19901-2:2017)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Spezielle Anforderungen
spécifiques relatives aux structures en mer - Partie 2: für Offshore-Anlagen - Teil 2: Seismische
Procédures de conception et critères sismiques (ISO Auslegungsverfahren und -kriterien (ISO 19901-
19901-2:2017) 2:2017)
This European Standard was approved by CEN on 18 November 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-2:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19901-2:2017) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"
in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries” the secretariat of which is held by CYS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2018, and conflicting national standards shall be
withdrawn at the latest by June 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 19901-2:2004.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19901-2:2017 has been approved by CEN as EN ISO 19901-2:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 19901-2
Second edition
2017-11
Petroleum and natural gas
industries — Specific requirements
for offshore structures —
Part 2:
Seismic design procedures and
criteria
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 2: Procédures de conception et critères sismiques
Reference number
ISO 19901-2:2017(E)
©
ISO 2017
ISO 19901-2:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
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ii © ISO 2017 – All rights reserved

ISO 19901-2:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4 Symbols and abbreviated terms . 5
4.1 Symbols . 5
4.2 Abbreviated terms . 6
5  Earthquake hazards . 7
6 Seismic design principles and methodology . 7
6.1 Design principles . 7
6.2 Seismic design procedures . 8
6.2.1 General. 8
6.2.2 Extreme level earthquake design . 9
6.2.3 Abnormal level earthquake design .10
6.3 Spectral acceleration data .11
6.4 Seismic risk category .11
6.5 Seismic design requirements.12
6.6 Site investigation .13
7  Simplified seismic action procedure .13
7.1 Soil classification and spectral shape .13
7.2 Seismic action procedure .17
8 Detailed seismic action procedure .18
8.1 Site-specific seismic hazard assessment .18
8.2 Probabilistic seismic hazard analysis .18
8.3 Deterministic seismic hazard analysis .19
8.4 Seismic action procedure .21
8.5 Local site response analyses .24
9  Performance requirements .24
9.1 ELE performance.24
9.2 ALE performance .25
Annex A (informative) Additional information and guidance .26
Annex B (informative) Simplified action procedure spectral accelerations .35
Annex C (informative) Regional information .46
Bibliography .50
ISO 19901-2:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the
...