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)

ISO 19901-2:2004 contains requirements for defining the seismic design procedures and criteria for offshore structures; guidance on the requirements is included. 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 ISO 19901-2:2004 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 seismic design procedures which are dependent on the platform's exposure level and the expected intensity of seismic events and 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 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.

Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 2: Seismische Auslegungsverfahren und-kriterien (ISO 19901-2:2004)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 2: Procédures de conception et critères sismiques (ISO 19901-2:2004)

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 2. del: Postopki potresno varnega projektiranja in potresna merila (ISO 19901-2:2004)

General Information

• Status: Withdrawn
• Publication Date: 14-Nov-2004
• Withdrawal Date: 12-Dec-2017
• ICS: 75.180.20 - Processing 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: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 13-Dec-2017
• Ref Project: SIST EN ISO 19901-2:2005 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 2: Seismic design procedures and criteria (ISO 19901-2:2004)

Relations

• Replaced By: 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: 14-Dec-2011

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-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 19901-2:2004)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 2:
Seismische Auslegungsverfahren und-kriterien (ISO 19901-2:2004)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 2: Procédures de conception et criteres sismiques (ISO 19901-2:2004)
Ta slovenski standard je istoveten z: EN ISO 19901-2:2004
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
91.120.25 =DãþLWDSUHGSRWUHVLLQ Seismic and vibration
YLEUDFLMDPL protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 19901-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 75.180.20
English version
Petroleum and natural gas industries - Specific requirements for
offshore structures - Part 2: Seismic design procedures and
criteria (ISO 19901-2:2004)
Industries du pétrole et du gaz naturel - Exigences
spécifiques relatives aux structures en mer - Partie 2:
Procédures de conception et critères sismiques (ISO
19901-2:2004)
This European Standard was approved by CEN on 4 November 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-2:2004: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 19901-2:2004) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore
structures for petroleum and natural gas industries", the secretariat of which is held by AFNOR.

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 May 2005, and conflicting national standards
shall be withdrawn at the latest by May 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 19901-2:2004 has been approved by CEN as EN ISO 19901-2:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 19901-2
First edition
2004-11-15
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 19901-2:2004(E)
©
ISO 2004
ISO 19901-2:2004(E)
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ii © ISO 2004 – All rights reserved

ISO 19901-2:2004(E)
Contents Page
Foreword. iv
Introduction . vi
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
6.3 Spectral acceleration data. 10
6.4 Seismic risk category . 11
6.5 Seismic design requirements . 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. 16
8.1 Site-specific seismic hazard assessment . 16
8.2 Probabilistic seismic hazard analysis . 17
8.3 Deterministic seismic hazard analysis . 17
8.4 Seismic action procedure . 19
8.5 Local site response analyses . 21
9 Performance requirements . 22
9.1 ELE performance . 22
9.2 ALE performance . 22
Annex A (informative) Additional information and guidance. 23
Annex B (informative) Regional information . 32
Bibliography . 45

ISO 19901-2:2004(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 19901-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures.
ISO 19901 consists of the following parts, under the general title Petroleum and natural gas industries —
Specific requirements for offshore structures:
 Part 1: Metocean design and operating considerations
 Part 2: Seismic design procedures and criteria
 Part 4: Geotechnical and foundation design considerations
 Part 5: Weight control during engineering and construction
 Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
The following parts of ISO 19901 are under preparation:
 Part 3: Topsides structure
 Part 6: Marine operations
ISO 19901 is one of a series of standards for offshore structures. The full series consists of the following
International Standards.
 ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
 ISO 19901 (all parts), Petroleum and natural gas industries — Specific requirements for offshore
structures
 ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
 ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
 ISO 19904-1, Petroleum and natural gas industries — Floating offshore structures — Part 1: Monohulls,
semi-submersibles and spars
iv © ISO 2004 – All rights reserved

ISO 19901-2:2004(E)
 ISO 19904-2, Petroleum and natural gas industries — Floating offshore structures — Part 2: Tension leg
platforms
 ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 1: Jack-ups
 ISO/TR 19905-2, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 2: Jack-ups commentary
 ISO 19906, Petroleum and natural gas industries — Arctic offshore structures
ISO 19901-2:2004(E)
Introduction
The series of International Standards applicable to types of offshore structure, ISO 19900 to ISO 19906,
constitutes a common basis covering those aspects that address design requirements and assessments of all
offshore structures used by the petroleum and natural gas industries worldwide. Through their application, the
intention is to achieve reliability levels appropriate
...