EN ISO 19901-1:2005

SLOVENSKI STANDARD
01-september-2006
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Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 1: Metocean design and operating considerations (ISO 19901-1:2005)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 1:
Grundsätze für die Auslegung und den Betrieb auf dem offenen Meer (ISO 19901-
1:2005)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 1: Dispositions océano-météorologiques pour la conception et
l'exploitation (ISO 19901-1:2005)
Ta slovenski standard je istoveten z: EN ISO 19901-1:2005
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 19901-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2005
ICS 75.180.10
English Version
Petroleum and natural gas industries - Specific requirements for
offshore structures - Part 1: Metocean design and operating
considerations (ISO 19901-1:2005)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Spezielle Anforderungen für
spécifiques relatives aux structures en mer - Partie 1: Offshore-Anlage - Teil 1: Grundsätze für die Auslegung und
Dispositions océano-météorologiques pour la conception et den Betrieb auf dem offenen Meer (ISO 19901-1:2005)
l'exploitation (ISO 19901-1:2005)
This European Standard was approved by CEN on 28 October 2005.
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.
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Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-1:2005: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 19901-1:2005) 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, petrochemical 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 2006, and conflicting national standards
shall be withdrawn at the latest by May 2006.

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 19901-1:2005 has been approved by CEN as EN ISO 19901-1:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 19901-1
First edition
2005-11-15
Petroleum and natural gas industries —
Specific requirements for offshore
structures —
Part 1:
Metocean design and operating
considerations
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 1: Dispositions océano-météorologiques pour la conception et
l'exploitation
Reference number
ISO 19901-1:2005(E)
©
ISO 2005
ISO 19901-1:2005(E)
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ISO 19901-1:2005(E)
Contents Page
Foreword. v
Introduction . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions. 2
4 Symbols and abbreviated terms . 9
4.1 Main symbols . 9
4.2 Abbreviated terms . 11
5 Determining the relevant metocean parameters . 11
5.1 General. 11
5.2 Expert interpretation of the metocean database . 12
5.3 Selecting appropriate parameters for determining design actions or action effects. 12
5.4 The metocean database . 13
5.5 Storm types in a region. 13
5.6 Directionality . 14
5.7 Extrapolation to rare conditions . 14
5.8 Metocean parameters for fatigue assessments . 14
5.9 Metocean parameters for short-term activities . 14
6 Water depth, tides and storm surges . 16
6.1 General. 16
6.2 Tides. 16
6.3 Storm surge. 16
7 Wind . 17
7.1 General. 17
7.2 Wind actions and action effects. 18
7.3 Wind profile and time-averaged wind speed . 19
7.4 Wind spectra . 19
8 Waves. 19
8.1 General. 19
8.2 Wave actions and action effects . 20
8.3 Intrinsic, apparent and encounter wave periods. 20
8.4 Two-dimensional wave kinematics . 21
8.5 Maximum height of an individual wave for long return periods . 21
8.6 Wave spectra. 21
8.7 Wave directional spreading function and spreading factor. 21
8.8 Wave crest elevation . 22
9 Currents . 22
9.1 General. 22
9.2 Current velocities. 22
9.3 Current profile . 23
9.4 Current profile stretching . 23
9.5 Current blockage . 23
10 Other environmental factors. 24
10.1 Marine growth . 24
10.2 Tsunamis . 24
10.3 Seiches . 25
10.4 Sea ice and icebergs . 25
ISO 19901-1:2005(E)
10.5 Snow and ice accretion . 25
10.6 Miscellaneous. 25
Annex A (informative) Additional information and guidance. 26
A.1 Scope. 26
A.2 Normative references . 26
A.3 Terms and definitions. 26
A.4 Symbols and abbreviations .
...