SIST EN ISO 19901-1:2016

Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2015)

This part of ISO 19901 gives general requirements for the determination and use of meteorological and
oceanographic (metocean) conditions for the design, construction and operation of offshore structures
of all types used in the petroleum and natural gas industries.
The requirements are divided into two broad types:
— those that relate to the determination of environmental conditions in general, together with the
metocean parameters that are required to adequately describe them;
— those that relate to the characterization and use of metocean parameters for the design, the
construction activities or the operation of offshore structures.
The environmental conditions and metocean parameters discussed are:
— extreme and abnormal values of metocean parameters that recur with given return periods that are
considerably longer than the design service life of the structure,
— long-term distributions of metocean parameters, in the form of cumulative, conditional, marginal or
joint statistics of metocean parameters, and
— normal environmental conditions that are expected to occur frequently during the design service
life of the structure.
Metocean parameters are applicable to:
— the determination of actions for the design of new structures,
— the determination of actions for the assessment of existing structures,
— the site-specific assessment of mobile offshore units,
— the determination of limiting environmental conditions, weather windows, actions and action
effects for pre-service and post-service situations (i.e. fabrication, transportation and installation
or decommissioning and removal of a structure), and
— the operation of the platform, where appropriate.
NOTE Specific metocean requirements for site-specific assessment of jack-ups are contained in ISO 19905-1,
for arctic offshore structures in ISO 19906 and for topside structures in ISO 19901-3.

Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 1: Grundsätze für die Auslegung und den Betrieb auf dem offenen Meer (ISO 19901-1:2015)

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 19901-1:2015)

L'ISO 19901-1:2015 fournit des exigences générales relatives à la détermination et à l'utilisation des conditions océanographiques et météorologiques («océano-météorologiques») pour la conception, la construction et l'exploitation des structures en mer de tous les types utilisés dans les industries du pétrole et du gaz naturel.
Les exigences sont scindées en deux grandes catégories:
?   celles liées à la détermination des conditions environnementales en général, associées aux paramètres océano-météorologiques requis pour les décrire de manière appropriée;
?   celles liées à la caractérisation et à l'utilisation des paramètres océano-météorologiques pour la conception, les activités de construction ou l'exploitation des structures en mer.
Les conditions environnementales et les paramètres océano-météorologiques examinés sont:
?   les valeurs extrêmes et anormales des paramètres océano-météorologiques qui réapparaissent à des intervalles de récurrence donnés nettement plus longs que la durée de vie en service de la structure;
?   les distributions à long terme des paramètres océano-météorologiques, sous forme de statistiques cumulées, conditionnelles, marginales ou conjointes; et
?   les conditions environnementales normales dont l'occurrence fréquente est attendue tout au long de la durée de vie en service de la structure.
Les paramètres océano-météorologiques sont applicables à:
?   la détermination des actions pour la conception des nouvelles structures;
?   la détermination des actions pour l'évaluation des structures existantes;
?   l'évaluation spécifique au site des unités mobiles en mer;
?   la détermination des conditions environnementales restrictives, des fenêtres météorologiques, des actions et de leurs effets pour les situations de pré- et post-service (c'est-à-dire la fabrication, le transport et l'installation ou la mise hors service et l'enlèvement d'une structure); et
?   l'exploitation de la plate-forme, le cas échéant.

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 1. del: Določila za načrtovanje in obratovanje ob upoštevanju oceanografskih in meteoroloških vidikov (ISO 19901-1:2015)

Ta del standarda ISO 19901 vsebuje splošne zahteve za določanje in uporabo meteoroloških in
oceanografskih (metoceanskih) pogojev za načrtovanje, gradnjo in delovanje naftnih ploščadi
vseh vrst, ki se uporabljajo v industriji nafte in zemeljskega plina.
Zahteve so razdeljene v dve osnovni vrsti:
– zahteve, povezane z določanjem okoljskih pogojev na splošno, skupaj z meteorološkimi in oceanografskimi parametri, ki so potrebni za njihov ustrezen opis;
– zahteve, povezane z opredelitvijo in uporabo meteoroloških in oceanografskih parametrov za načrtovanje, gradbene dejavnosti ali delovanje naftnih ploščadi.
Okoljski pogoji ter obravnavani meteorološki in oceanografski parametri so naslednji:
– ekstremne in nenormalne vrednosti meteoroloških in oceanografskih parametrov, ki se pojavljajo z določenimi povratnimi dobami, ki so precej daljše od življenjske dobe strukture,
– dolgoročne motnje meteoroloških in oceanografskih parametrov v obliki kumulativnih, pogojnih, mejnih ali skupnih statističnih podatkov o meteoroloških in oceanografskih parametrih ter
– običajni okoljski pogoji, ki naj bi se pogosto pojavili med življenjsko dobo strukture.
Meteorološki in oceanografski parametri se uporabljajo za:
– določanje ukrepov za načrtovanje novih struktur,
– določanje ukrepov za oceno obstoječih struktur,
– oceno mobilnih naftnih ploščadi na področju postavitve,
– določanje omejenih okoljskih pogojev, vremenskih oken, ukrepov in učinkov ukrepov za okoliščine pred storitvijo in po njej (tj. izdelava, promet in namestitev ali prenehanje uporabe ter odstranitev strukture) in
– po potrebi delovanje platforme.
OPOMBA: Posebne meteorološke in oceanografske zahteve za oceno dvižnih ploščadi na področju postavitve so zajete v standardu ISO 19905-1, za arktične naftne ploščadi v standardu ISO 19906 in za strukture na palubi v standardu ISO 19901-3.

General Information

• Status: Published
• Public Enquiry End Date: 19-Jan-2014
• Publication Date: 08-Dec-2015
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Nov-2015
• Due Date: 25-Jan-2016
• Completion Date: 09-Dec-2015
• Ref Project: EN ISO 19901-1:2015 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2015)

Relations

• Replaces: SIST EN ISO 19901-1:2006 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2005)
• Effective Date: 01-Jan-2016
• Replaces: SIST EN ISO 19901-1:2006 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2005)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 19901-1:2016
01-januar-2016
1DGRPHãþD
SIST EN ISO 19901-1:2006
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD3RVHEQH]DKWHYH]DQDIWQH
SORãþDGLGHO'RORþLOD]DQDþUWRYDQMHLQREUDWRYDQMHREXSRãWHYDQMX
RFHDQRJUDIVNLKLQPHWHRURORãNLKYLGLNRY,62
Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 1: Metocean design and operating considerations (ISO 19901-1:2015)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 1:
Grundsätze für die Auslegung und den Betrieb auf dem offenen Meer (ISO 19901-
1:2015)
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 19901-1:2015)
Ta slovenski standard je istoveten z: EN ISO 19901-1:2015
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
SIST EN ISO 19901-1:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 19901-1:2016

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SIST EN ISO 19901-1:2016


EN ISO 19901-1
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2015
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-1:2005
English Version

Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 1: Metocean
design and operating considerations (ISO 19901-1:2015)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Erdöl- und
spécifiques relatives aux structures en mer - Partie 1: Erdgasindustrie - Spezielle Anforderungen für
Dispositions océano-météorologiques pour la Offshore-Anlagen - Teil 1: Grundsätze für die
conception et l'exploitation (ISO 19901-1:2015) Auslegung und den Betrieb auf dem offenen Meer (ISO
19901-1:2015)
This European Standard was approved by CEN on 17 July 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-1:2015 E
worldwide for CEN national Members.

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SIST EN ISO 19901-1:2016
EN ISO 19901-1:2015 (E)
Contents Page
European Foreword . 3

2

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SIST EN ISO 19901-1:2016
EN ISO 19901-1:2015 (E)
European Foreword
This document (EN ISO 19901-1:2015) 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 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 2016, and conflicting national standards shall be
withdrawn at the latest by May 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 19901-1:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19901-1:2015 has been approved by CEN as EN ISO 19901-1:2015 without any
modification.
3

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SIST EN ISO 19901-1:2016

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SIST EN ISO 19901-1:2016
INTERNATIONAL ISO
STANDARD 19901-1
Second edition
2015-10-15
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 19901-1:2015(E)
©
ISO 2015

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(E)

Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4 Symbols and abbreviated terms . 9
4.1 Symbols . 9
4.2 Abbreviated terms .12
5 Determining the relevant metocean parameters .12
5.1 General .12
5.2 Expert development of metocean criteria .13
5.3 Selecting appropriate parameters for determining design actions and action effects .13
5.4 The metocean database .14
5.5 Storm types in a region .14
5.6 Directionality .14
5.7 Extrapolation to extreme and abnormal conditions .15
5.8 Metocean parameters for fatigue assessments .15
5.9 Metocean parameters for short-term activities.16
5.10 Metocean parameters for medium-term activities .17
6 Water depth, tides and storm surges .17
6.1 General .17
6.2 Tides .17
6.3 Storm surges .18
6.4 Extreme water level .18
7 Wind .19
7.1 General .19
7.2 Wind actions and action effects .20
7.3 Wind profile and time-averaged wind speed.21
7.4 Wind spectra .21
8 Waves .21
8.1 General .21
8.2 Wave actions and action effects .22
8.3 Sea states — Spectral waves .23
8.3.1 Wave spectrum .23
8.3.2 Directional spreading .23
8.3.3 Wave periods .23
8.3.4 Wave kinematics — Velocities and accelerations .23
8.4 Regular (periodic) waves .24
8.4.1 General.24
8.4.2 Wave period .24
8.4.3 Wave kinematics — Velocities and accelerations .24
8.4.4 Intrinsic, apparent and encounter wave periods .24
8.5 Maximum height of an individual wave for long return periods .25
8.6 Linear wave models .25
8.7 Wave crest elevation .25
9 Currents .26
9.1 General .26
9.2 Current velocities .26
9.3 Current profile .27
9.4 Current profile stretching .27
9.5 Current blockage .27
© ISO 2015 – All rights reserved iii

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(E)

10 Other environmental factors .27
10.1 Marine growth .27
10.2 Tsunamis .28
10.3 Seiches .28
10.4 Sea ice and icebergs .28
10.5 Snow and ice accretion .28
10.6 Miscellaneous .29
11 Collection of metocean data .29
11.1 General .29
11.2 Common requirements .30
11.2.1 General.30
11.2.2 Instrumentation .30
11.3 Meteorology .30
11.3.1 General.30
11.3.2 Weather observation and reporting for helicopter operations .30
11.3.3 Weather observation and reporting for weather forecasting services .31
11.3.4 Weather observation and reporting for climatological purposes .31
11.4 Oceanography .31
11.4.1 General.31
11.4.2 Measurements and observations .32
11.5 Data quality control .32
12 Information concerning the annexes .32
12.1 Information concerning Annex A .32
12.2 Information concerning the regional annexes .32
Annex A (informative) Additional information and guidance .33
Annex B (informative) Northwest Europe .82
Annex C (informative) West coast of Africa .92
Annex D (informative) Offshore Canada .103
Annex E (informative) Sakhalin/Sea of Okhotsk .131
Annex F (informative) Caspian Sea .155
Annex G (informative) Southern East Asian Sea .173
Bibliography .195
iv © ISO 2015 – All rights reserved

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(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 development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures.
This second edition cancels and replaces the first edition (ISO 19901-1:2005), which has been
technically revised.
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 3: Topsides structure
— 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
— Part 8: Marine soil investigations
The following parts are under preparation:
— Part 6: Marine operations
— Part 9: Structural integrity management
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 2015 – All rights reserved v

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(E)

— 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
— 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
1)
— ISO 19905-3 , Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 3: Floating unit
— ISO 19906, Petroleum and natural gas industries — Arctic offshore structures
1) In preparation.
vi © ISO 2015 – All rights reserved

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SIST EN ISO 19901-1:2016
ISO 19901-1:2015(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 for manned and unmanned offshore
structures, whatever the type of structure and the nature or combination of the materials used.
It is important to recognize that structural integrity is an overall concept comprising models for
describing actions, structural analyses, design rules, safety elements, workmanship, quality control
procedures and national requirements, all of which are mutually dependent. The modification of one
aspect of design in isolation can disturb the balance of reliability inherent in the overall concept or
structural system. The implications involved in modifications, therefore, need to be considered in
relation to the overall reliability of all offshore structural systems.
The series of International Standards applicable to types of offshore structure is intended to provide a wide
latitude in the choice of structural configurations, materials and techniques without hindering innovation.
Sound engineering judgement is therefore necessary in the use of these International Standards.
The overall concept of structural integrity is described above. Some additional considerations apply
for metocean design and operating conditions. The term “metocean” is short for “meteorological and
oceanographic” and refers to the discipline concerned with the establishment of relevant environmental
conditions for the design and operation of offshore structures. A major consideration in the design and
operation of such a structure is the determination of actions on, and the behaviour of, the structure as a
result of winds, waves and currents.
Environmental conditions vary widely around the world. For the majority of offshore locations there
are little numerical data from historic conditions; comprehensive data often only start being collected
when there is a specific need, for example, when exploration for hydrocarbons is being considered.
Despite the usually short duration for which data are available, designers of offshore structures need
estimates of extreme and abnormal environmental conditions (with an individual or joint probability of
−2 −3 −4
the order of 1 × 10 /year and 1 × 10 to 1 × 10 /year, respectively).
Even for areas like the Gulf of Mexico, offshore Indonesia and the North Sea, where there are up to 30 years
of fairly reliable measurements available, the data are insufficient for rigorous statistical determination
of appropriate extreme and abnormal environmental conditions. The determination of relevant design
parameters has therefore to rely on the interpretation of
...

SLOVENSKI STANDARD
oSIST prEN ISO 19901-1:2014
01-januar-2014
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD3RVHEQH]DKWHYH]DQDIWQH
SORãþDGLGHO'RORþLOD]DQDþUWRYDQMHLQREUDWRYDQMHREXSRãWHYDQMX
RFHDQRJUDIVNLKLQPHWHRURORãNLKYLGLNRY,62',6
Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 1: Metocean design and operating considerations (ISO/DIS 19901-1:2013)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 1:
Grundsätze für die Auslegung und den Betrieb auf dem offenen Meer (ISO/DIS 19901-
1:2013)
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/DIS 19901-1:2013)
Ta slovenski standard je istoveten z: prEN ISO 19901-1
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
oSIST prEN ISO 19901-1:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 19901-1:2014

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oSIST prEN ISO 19901-1:2014
DRAFT INTERNATIONAL STANDARD
ISO/DIS 19901-1
ISO/TC 67/SC 7 Secretariat: BSI
Voting begins on: Voting terminates on:
2013-08-22 2014-01-22
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
[Revision of first edition (ISO 19901-1:2005)]
ICS: 75.180.10
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 19901-1:2013(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2013

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oSIST prEN ISO 19901-1:2014
ISO/DIS 19901-1:2013(E)

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
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Fax + 41 22 749 09 47
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Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved

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oSIST prEN ISO 19901-1:2014
ISO/DIS 19901-1
Contents Page
Foreword . ix
Introduction . xi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 9
4.1 Symbols . 9
4.2 Abbreviated terms . 12
5 Determining the relevant metocean parameters . 12
5.1 General . 12
5.2 Expert development of metocean criteria . 13
5.3 Selecting appropriate parameters for determining design actions and action effects . 13
5.4 The metocean database . 14
5.5 Storm types in a region . 14
5.6 Directionality . 15
5.7 Extrapolation to extreme and abnormal conditions . 15
5.8 Metocean parameters for fatigue assessments . 15
5.9 Metocean parameters for short-term activities . 16
5.10 Metocean parameters for medium-term activities . 17
6 Water depth, tides and storm surges . 17
6.1 General . 17
6.2 Tides . 18
6.3 Storm surges . 18
6.4 Extreme water level . 18
7 Wind . 19
7.1 General . 19
7.2 Wind actions and action effects . 20
7.3 Wind profile and time-averaged wind speed . 21
7.4 Wind spectra . 21
8 Waves . 21
8.1 General . 21
8.2 Wave actions and action effects . 22
8.3 Sea states — Spectral waves . 23
8.3.1 Wave spectrum . 23
8.3.2 Directional spreading . 23
8.3.3 Wave periods . 23
8.3.4 Wave kinematics — Velocities and accelerations . 23
8.4 Regular (periodic) waves . 24
8.4.1 General . 24
8.4.2 Wave period . 24
8.4.3 Wave kinematics — Velocities and accelerations . 24
8.4.4 Intrinsic, apparent and encounter wave periods . 24
8.5 Maximum height of an individual wave for long return periods . 25
8.6 Linear wave models . 25
8.7 Wave crest elevation . 26
9 Currents . 26
9.1 General . 26
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oSIST prEN ISO 19901-1:2014
ISO/DIS 19901-1
9.2 Current velocities. 26
9.3 Current profile . 27
9.4 Current profile stretching . 27
9.5 Current blockage . 27
10 Other environmental factors . 27
10.1 Marine growth . 27
10.2 Tsunamis . 28
10.3 Seiches . 28
10.4 Sea ice and icebergs . 28
10.5 Snow and ice accretion . 29
10.6 Miscellaneous . 29
11 Collection of metocean data . 29
11.1 General . 29
11.2 Common requirements . 30
11.2.1 General . 30
11.2.2 Instrumentation . 30
11.3 Meteorology . 30
11.3.1 General . 30
11.3.2 Weather observation and reporting for helicopter operations . 30
11.3.3 Weather observation and reporting for weather forecasting services . 31
11.3.4 Weather observation and reporting for climatological purposes . 32
11.4 Oceanography . 32
11.4.1 General . 32
11.4.2 Measurements and observations . 32
11.5 Data quality control . 32
12 Information concerning the annexes . 33
12.1 Information concerning Annex A . 33
12.2 Information concerning the regional annexes . 33
Annex A (informative) Additional information and guidance. 34
A.1 Scope . 34
A.2 Normative references . 34
A.3 Terms and definitions . 34
A.4 Symbols and abbreviated terms . 34
A.5 Determining the relevant metocean parameters . 34
A.5.1 General . 34
A.5.2 Expert development of metocean criteria . 35
A.5.3 Selecting appropriate parameters for determining design actions or action effects . 36
A.5.4 The metocean database . 38
A.5.5 Storm types in a region . 40
A.5.6 Directionality . 40
A.5.7 Extrapolation to extreme or abnormal conditions . 40
A.5.8 Metocean parameters for fatigue assessments . 42
A.5.9 Metocean parameters for short-term activities . 43
A.6 Water depth, tides and storm surges . 44
A.6.1 General . 44
A.6.2 Tides . 44
A.6.3 Storm surge . 45
A.6.4 Extreme water level . 45
A.7 Wind . 45
A.7.1 General . 45
A.7.2 Wind actions and action effects . 46
A.7.3 Wind profile and time-averaged wind speed . 47
A.7.4 Wind spectra . 48
A.8 Waves . 50
A.8.1 General . 50
A.8.2 Wave actions and action effects . 53
A.8.3 Sea states — Spectral waves . 53
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oSIST prEN ISO 19901-1:2014
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A.8.4 Regular (periodic) waves . 60
A.8.5 Maximum height of an individual wave for long return periods . 66
A.8.6 Fully non-linear wave models . 67
A.8.7 Wave crest elevation . 67
A.9 Currents . 68
A.9.1 General . 68
A.9.2 Current velocities . 69
A.9.3 Current profile . 69
A.9.4 Current profile stretching . 70
A.9.5 Current blockage . 72
A.10 Other environmental factors . 73
A.10.1 Marine growth . 73
A.10.2 Tsunamis . 73
A.10.3 Seiches . 73
A.10.4 Sea ice and icebergs . 73
A.10.5 Snow and ice accretion . 74
A.10.6 Miscellaneous . 74
A.11 Collection of metocean data. 74
A.11.2 Common requirements . 75
A.11.3 Meteorology . 1
A.11.4 Oceanography . 1
A.11.5 Data quality control . 2
Annex B (informative) Northwest Europe . 3
B.1 Description of region . 3
B.2 Data sources . 3
B.3 Overview of regional climatology . 3
B.4 Water depth, tides and storm surges . 4
B.5 Winds . 4
B.6 Waves . 4
B.7 Currents . 4
B.8 Other environmental factors . 5
B.8.1 Marine growth . 5
B.8.2 Sea ice and icebergs . 5
B.8.3 Snow and ice accretion . 6
B.8.4 Air temperature, humidity, and visibility . 7
B.8.5 Sea water temperature and salinity . 7
B.9 Estimates of metocean parameters . 7
B.9.1 Extreme metocean parameters . 7
B.9.2 Long-term distributions of metocean parameters . 10
Annex C (informative) West coast of Africa . 13
C.1 Description of region . 13
C.2 Data sources . 13
C.3 Overview of regional climatology . 13
C.4 Water depth, tides and storm surges . 13
C.5 Winds . 14
C.6 Waves . 14
C.7 Currents . 15
C.8 Other environmental factors . 16
C.8.1 Marine growth . 16
C.8.2 Tsunamis . 16
C.8.3 Sea ice and icebergs . 16
C.8.4 Snow and ice accretion . 16
C.8.5 Air temperature, humidity, pressure and visibility . 16
C.8.6 Sea water temperature and salinity . 17
C.9 Estimates of metocean parameters . 17
C.9.1 Extreme metocean parameters . 17
C.9.2 Long-term distributions of metocean parameters . 20
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Annex D (informative) United States — Gulf of Mexico, coast of California and other US waters . 25
D.1 United States — Gulf of Mexico . 25
D.1.1 Description of region . 25
D.1.2 Data sources . 27
D.1.3 Overview of regional climatology . 28
D.1.4 Water depth, tides and storm surges . 30
D.1.5 Winds .
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