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)

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 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 can be used with corresponding scale factors to determine appropriate seismic actions for the design of a structure, unless more detailed information is available from local code or site-specific study.
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. Seismic requirements for floating structures are contained in ISO 19904, for site-specific assessment of jack-ups and other MOUs in the ISO 19905 series, 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 19901-2:2022)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 2: Procédures de conception sismique et critères (ISO 19901-2:2022)

Le présent document spécifie les exigences relatives à la définition des procédures et critères de conception parasismique pour les structures en mer; les recommandations 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 des 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 le plus bas qui soit raisonnablement réalisable. Ce résultat est obtenu 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 matière de résistance et de rigidité avant d'être vérifiée par rapport à des événements environnementaux anormaux ou à l'état limite anormal (ALS), afin de garantir qu'elle satisfait aux exigences de réserve de résistance 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, les procédures de l'étude PSHA ne sont pas expliquées de manière approfondie.
Lorsqu'une approche de conception simplifiée est admise, des cartes des eaux mondiales, incluses dans l'Annexe B, indiquent l'intensité des secousses du sol pour une période de retour de 1 000 ans. Dans de tels cas, ces cartes peuvent être utilisées avec les facteurs d'échelle correspondants pour déterminer les actions sismiques appropriées pour la conception d'une structure, sauf si des informations plus détaillées sont fournies par un code local ou une étude spécifique au site.
NOTE      Pour la conception des structures en mer fixes en acier, d'autres exigences spécifiques et des valeurs recommandées des paramètres de conception (par exemple: coefficients d'action et de résistance partiels) 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, la série ISO 19905 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 19901-2:2022)

Ta dokument vsebuje zahteve za opredelitev postopkov potresno varnega projektiranja in potresnih meril za naftne ploščadi; smernice o zahtevah so podane v dodatku A. Zahteve se osredotočajo na varjene jeklene konstrukcije naftnih ploščadi ter nepremične betonske konstrukcije naftnih ploščadi. Na kratko obravnava učinke potresnih dogodkov
na plavajoče in delno plovne konstrukcije. Ocena dvižnih ploščadi na področju postavitve
je v tem dokumentu obravnavana le v obsegu, na katerega se navezujejo zahteve.
Podrobno so obravnavani samo premiki tal, ki jih sproži potres. Druga geološko pogojena tveganja, kot so utekočinjenje, nestabilnost pobočij, zdrsi, cunamiji, blatni vulkani in udarni valovi, so le omenjena
in obravnavana na kratko.
Namen zahtev je zmanjšati tveganja za osebe, okolje in sredstva na najnižjo
raven, ki je razumno dosegljiva. Ta namen se doseže z uporabo:
a) postopkov potresno varnega projektiranja, ki so odvisni od stopnje izpostavljenosti naftne ploščadi in
pričakovane jakosti potresnih dogodkov;
b) dvostopenjskega preverjanja potresno varnega projekta, v katerem je konstrukcija projektirana za končno mejno stanje (ULS) moči in togosti, nato pa preverjena še za neobičajne okoljske dejavnike ali neobičajno mejno stanje (ALS), s čimer se zagotovi, da konstrukcija izpolnjuje zahteve glede rezervne trdnosti in sproščanja energije. Za naftne ploščadi v območjih z visoko stopnjo potresne dejavnosti in/ali visoko stopnjo izpostavljenosti so obravnavani postopki in zahteve za verjetnostno analizo potresne nevarnosti (PSHA) na področju postavitve. V obravnavo pa ni zajeta podrobnejša razlaga postopkov verjetnostne analize potresne nevarnosti.
Za poenostavljen pristop k projektiranju, kadar je ta dovoljen, je na svetovnih obalnih zemljevidih, ki so vključeni v dodatek B, prikazana jakost tresenja tal s povratno dobo 1000 let. V takih primerih se lahko ti zemljevidi z ustreznimi faktorji merila uporabijo za določitev ustreznih potresnih vplivov za projektiranje konstrukcije, razen če so na voljo podrobnejše informacije iz lokalnih predpisov ali študije področja postavitve.
OPOMBA: Dodatne posebne zahteve in priporočene vrednosti projektnih parametrov (npr. faktor delnega vpliva in faktor odpornosti) za projektiranje varjenih jeklenih konstrukcij naftnih ploščadi so zajete v standardu ISO 19902, zahteve za nepremične betonske konstrukcije naftnih ploščadi pa v standardu ISO 19903. Potresne zahteve so za plavajoče konstrukcije zajete v standardu ISO 19904, za oceno dvižnih ploščadi na področju postavitve ter druge premične naftne ploščadi v skupini standardov ISO 19905, za arktične konstrukcije v standardu ISO 19906, za konstrukcije na palubi pa v standardu ISO 19901-3.

General Information

• Status: Published
• Publication Date: 05-Jul-2022
• Withdrawal Date: 30-Jan-2023
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• 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: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 06-Jul-2022
• Completion Date: 06-Jul-2022
• Ref Project: SIST 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)

Relations

• Replaces: 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)
• Effective Date: 29-Jun-2022
• Revised: EN ISO 11114-2:2013 - Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 2: Non-metallic materials (ISO 11114-2:2013)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN ISO 19901-2:2018
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne
ploščadi - 2. del: Postopki potresno varnega projektiranja in potresna merila (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)
Erdöl- und Erdgasindustrie – Spezielle Anforderungen für Offshore-Anlagen – Teil 2:
Seismische Auslegungsverfahren und -kriterien (ISO 19901-2:2022)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 2: Procédures de conception sismique et critères (ISO 19901-2:2022)
Ta slovenski standard je istoveten z: EN ISO 19901-2:2022
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
91.120.25 Zaščita pred potresi in Seismic and vibration
vibracijami protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19901-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2022
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-2:2017
English Version
Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 2: Seismic
design procedures and criteria (ISO 19901-2:2022)
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 sismique et critères (ISO Auslegungsverfahren und -kriterien (ISO 19901-
19901-2:2022) 2:2022)
This European Standard was approved by CEN on 12 June 2022.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19901-2:2022) has been prepared by Technical Committee CEN/TC 67 "NA" 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 NEN.
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 January 2023, and conflicting national standards shall
be withdrawn at the latest by January 2023.
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 19901-2:2017.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 19901-2:2022 has been approved by CEN as EN ISO 19901-2:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 19901-2
Third edition
2022-06
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 sismique et critères
Reference number
ISO 19901-2:2022(E)
ISO 19901-2:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 19901-2:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4 Symbols and abbreviated terms.4
4.1 Symbols . 4
4.2 Abbreviated terms . 6
5  Earthquake hazards .6
6 Seismic design principles and methodology . 7
6.1 Design principles . 7
6.2 Seismic design procedures . 7
6.2.1 General . 7
6.2.2 Extreme level earthquake design. 9
6.2.3 Abnormal level earthquake design . 9
6.3 Spectral acceleration data . 10
6.4 Seismic risk category . 10
6.5 Seismic design requirements . 11
6.6 Site investigation .12
7  Simplified seismic action procedure .12
7.1 Soil classification and spectral shape .12
7.2 Seismic action procedure . 16
8 Detailed seismic action procedure .17
8.1 Site-specific seismic hazard assessment . 17
8.2 Probabilistic seismic hazard analysis . 17
8.3 Deterministic seismic hazard analysis . 20
8.4 Seismic action procedure . 20
8.5 Local site response analyses .23
9  Performance requirements . .24
9.1 ELE performance . 24
9.2 ALE performance. 24
Annex A (informative) Additional information and guidance .25
Annex B (informative) Simplified action procedure spectral accelerations .34
Annex C (informative) Regional information .47
Bibliography .52
iii
ISO 19901-2:2022(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
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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 a
...